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OPTICAL WAVEGUIDE SENSOR

Subclass of:

385 - Optical waveguides

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Class / Patent application numberDescriptionNumber of patent applications / Date published
385013000 Including physical deformation or movement of waveguide 82
Entries
DocumentTitleDate
20130028554APPARATUS AND METHODS FOR FIBER INTEGRATION AND REGISTRATION - Systems and methods for integrating and/or registering a shape sensing fiber in or to various instruments are described herein. Registration fixtures and registration techniques for matching the coordinate system of a fiber to the coordinate system of an elongate instrument or other device are provided. Various systems and methods for integrating a shape sensing fiber into an elongate instrument or other device are also described herein.01-31-2013
20130028555Fiber Optic Sensor Thermally Matched Support Tubes for Distributed Fiber Optic Sensing - Distributed fiber optic sensor includes a composite support tube that closely matches the coefficient of thermal expansion of the optical sensing fiber contained therewithin for applications including but not limited to Rayleigh back-scattering, (OFDR, Optical Frequency Domain Reflectometry), Brillouin frequency shift (BOTDA, Brillouin Optical Time Domain Analysis, BOTDR, Brillouin Optical Time Domain Reflectometry), Raman (Optical Time Domain Reflectometry), DPP-BOTDA (Differential Pulse Pair Brillouin Optical Time Domain Analysis), Dual-Index BOTDA, PCF (Photonic Crystalline Fibers), and dense packed Fiber Bragg Gratings, both time and wave length modulated are described in detail.01-31-2013
20090196544WAVEGUIDE SENSOR FOR SENSING - A waveguide sensor according to an embodiment of the present invention includes: a substrate; a first underclad arranged on one side of the substrate; a first sensing core arranged on outer side of the first underclad and having a stripe pattern which extends in one direction; a first overclad arranged on outer side of the first sensing core; a second underclad arranged on another side of the substrate; a second sensing core arranged on outer side of the second underclad and having a stripe pattern which extends in a direction not parallel to the direction in which the first sensing core extends; and a second overclad arranged on outer side of the second sensing core. A first grooved part which extends in a direction not parallel to the direction in which the first sensing core extends is formed on the first overclad, so that the first grooved part and the first sensing core together form a first grating in a plane view. Furthermore, a second grooved part which extends in a direction not parallel to the direction in which the second sensing core extends is formed on the second overclad, so that the second grooved part and the second sensing core together form a second grating in a plane view.08-06-2009
20090196543Fiber Optic Acceleration and Displacement Sensors - A fiber optic sensor for detecting acceleration or displacement includes a fiber optic probe with a multimode transmitting optical fiber, a multimode receiving optical fiber and a edge reflector spaced apart from the fiber probe. The reflector moves in a transverse direction substantially normal to the longitudinal axis of the fiber optic probe, so the amount of light received by the receiving fiber indicates a relative acceleration or a relative displacement of the reflective surface with respect to the fiber probe in the transverse direction of motion of the edge of the reflector. The reflector can be mounted on a cantilever beam. The sensor can have one transmitting fiber, two receiving fiber, and a reflector with two edges, each edge partially covering one of the receiving fibers. A triaxial sensor system has at least two two-fiber sensors.08-06-2009
20090092351HIGH DENSITY FIBER OPTIC ACOUSTIC ARRAY - A method for optimizing the architecture of a linear sensor array using WDM-TDM technology and stabilizing the reflectivity spectral profile of the fiber Bragg gratings of the sensors against the influence of environmental factors such as pressure and temperature is provided. The method includes stripping a portion of the foamed coating on the exterior of an optical fiber in the region of the fiber Bragg grating to thin the coating in the region of the grating. After the coating is stripped and the optical fiber cleaned, the area of stripped fiber is recoated with an unvoided plastic.04-09-2009
20110194805FIBER BRAGG GRATING IN MICRO/NANOFIBER AND METHOD OF PRODUCING THE SAME - A method of fabricating Fiber Bragg gratings in a micro/nanofiber using ultrashort pulse irradiation, the method includes elongating and flame-brushing a single mode optical fiber to create a micro/nanofiber, and generating the ultrashort pulse irradiation to induce a plurality of refractive index changes at predetermined intervals within the micro/nanofiber, wherein the ultrashort pulse propagates through a focusing element and a diffractive element prior to propagating on the micro/nanofiber.08-11-2011
20100158431Optical Fiber Surveillance Topology - In accordance with an aspect of the disclosed technology, a fiber surveillance system includes a single optical fiber, used, for example, in the detection of acoustic signals associated with vibrations or other activity. In one embodiment of the disclosed technology, the fiber is arranged in a two dimensional topology to improve the spatial resolution of the system. With such a topology the spatial monitoring resolution of the surveillance system is significantly improved over systems in which the fiber is deployed in an essentially straight line topology. In a further embodiment of the disclosed technology, two or more such oriented fibers are juxtaposed or overlapped to yield even greater resolution.06-24-2010
20130077912SPR SENSOR CELL AND SPR SENSOR - An SPR sensor cell is an SPR sensor cell including an optical waveguide to be brought into contact with a sample. The optical waveguide includes an under clad layer, a core layer provided in the under clad layer such that at least a part thereof is exposed from the under clad layer, and a metal particle layer covering the core layer exposed from the under clad layer to be brought into contact with the sample.03-28-2013
20120263409PHOTODETECTING FIBER - Photodetecting fiber. The fiber detects and localizes an incident optical beam. A semiconducting core is in intimate contact with a material forming a resistive channel that breaks axial symmetry. The resistive channel has a resistivity between that of metals and the semiconducting core, enabling the imposition of non-uniform, convex electric potential distributions along the fiber axis allowing photo-current measurements along the fiber.10-18-2012
20090074348HARSH ENVIRONMENT TEMPERATURE SENSING SYSTEM AND METHOD - A gasification distributed temperature sensing system is disclosed. The sensing system includes a gasification vessel and a harsh environment fiber sensing cable package disposed within the gasification vessel, the sensing cable package includes a thermally conductive enclosure and at least one sensor cable including a distributed array of high-temperature fiber Bragg grating sensors, wherein the sensors are disposed and hermetically sealed within the thermally conductive enclosure.03-19-2009
20130084037NANO-STRUCTURED TRAMPOLINE FIBER GAS SENSOR - A fiber gas sensor including a core fiber comprising at least one Bragg grating region, a fiber cladding in contact with the core fiber along an entire length of the core fiber, and a sensing matrix structure disposed upon the outer surface of the fiber cladding along a portion of the length of the fiber cladding and surrounding the fiber Bragg grating region. The sensing matrix structure comprising a bonding layer disposed on the outer surface of the fiber cladding layer, a nano-structured trampoline matrix layer disposed on the outer surface of the bonding layer and a capping layer disposed on the outer surface of the matrix layer. The thermally modulated response amplitude of the fiber gas sensor is found to linearly depend upon the gas molecular weight, and can be directly used to determine heat specific capacity ratio of Cp/Cv.04-04-2013
20130089287Optical Sensor Cable for Use in Measurements in UV Light and for Use During Irradiation Processes - The invention relates to an optical sensor cable provided in the form of a ribbon cable (04-11-2013
20090304322DISTRIBUTED VIBRATION SENSING SYSTEM USING MULTIMODE FIBER - An optical time domain reflectometry (OTDR) system is configured to detect Rayleigh backscatter reflected from a multimode sensing optical fiber. The system includes a single spatial mode filtering system to select a single speckle of the Rayleigh backscatter produced in response to an optical pulse launched into the multimode fiber. The detected single speckle may be used for distributed disturbance (vibration) detection.12-10-2009
20130071061Optical Circuit for Sensing a Biological Entity in a Fluid and Method of Configuring the Same - An optical circuit for sensing a biological entity in a fluid and a method of configuring an optical circuit for sensing a biological entity in a fluid are provided. The optical circuit includes a sensing arrangement including a reference arm having a reference waveguide and a sensing arm having a waveguide; wherein lengths of the reference waveguide and the waveguide are configured in accordance with a temperature dependency reduction criterion.03-21-2013
20090297089Fiber grating sensor - A fiber grating sensor including an elastic circular plate and one or two FBG'ss attached to the bottom surface of the elastic circular plate. Two ends of the FBG are connected to an optic fiber for signal transmission. The fiber grating sensor readouts are independent of temperature variation. The fiber grating sensor mechanism according to the present invention may be applied in a variety of sensors such as gauge pressure transducer, differential pressure transducer, load cell and displacement transducer with a distributive design, and for various purposes.12-03-2009
20090269003FIBRE OPTIC SWEAT SENSOR - A sensor for sweat or other aqueous discharge onto skin comprises a plastic optical fibre comprising a core and cladding, said core being in intimate contact at a first end with a light emitter and at a second end with a light detector, and said fibre having a sensing zone in which the cladding is replaced by a water-permeable translucent biocompatible polymer containing dispersed therein a biocompatible indicator that varies the intensity of an optical signal at a selected wavelength depending on whether the indicator is wet or dry. Such a sensor permits real time monitoring of sweating or other discharge, and can also enable electronic recording and/or remote monitoring.10-29-2009
20090269002SYSTEMS AND METHODS FOR SENSING PROPERTIES OF A WORKPIECE AND EMBEDDING A PHOTONIC SENSOR IN METAL - Systems and methods for sensing properties of a workpiece and embedding a photonic sensor in metal are disclosed herein. In some embodiments, systems for sensing properties of a workpiece include an optical input, a photonic device, an optical detector, and a digital processing device. The optical input provides an optical signal at an output of the optical input. The photonic device is coupled to the workpiece and to the output of the optical input. The photonic device generates an output signal in response to the optical signal, wherein at least one of an intensity of the output signal and a wavelength of the output signal depends on at least one of thermal characteristics and mechanical characteristics of the workpiece. The optical detector receives the output signal from the photonic device and is configured to generate a corresponding electronic signal. The digital processing device is coupled to the optical detector and determines at least one of the thermal characteristics and mechanical the characteristics of the workpiece based on the electronic signal.10-29-2009
20090269001Apparatus and Method for Detecting Intrusion by Using Fiber Bragg Grating Sensor - Disclosed are an apparatus and a method for detecting intrusion by using fiber Bragg grating (FBG) sensors. the apparatus includes a measurement system, an optical fiber for transmitting and detecting optical signals, and a plurality of FBG sensors installed in intrusion detection areas together with the optical fiber and representing reflective wavelengths different from each other. The method includes the steps of installing the optical fiber and the FBG sensors in predetermined intrusion areas, continuously measuring wavelength variation or wavelength intensity of the optical fiber by using the measurement system, and comparing the measured wavelength variation or measured wavelength intensity of the optical fiber with a reference value, thereby determining intrusion of an intruder. Since the apparatus includes the optical switch and the optical distributor, the system establishment cost is reduced, the intrusion detection area is enlarged, and plural independent intrusion detection areas are formed.10-29-2009
20090245718Optical Sensor And Method Employing Half-Core Hollow Optical Waveguide - An optical sensor, sensing system and method of sensing employ a half-core hollow optical waveguide adjacent to a surface of an optical waveguide layer of a substrate. The half-core hollow optical waveguide and the adjacent optical waveguide layer cooperatively provide both an optical path that confines and guides an optical signal and an internal hollow channel. The optical path and channel extend longitudinally along a hollow core of the half-core hollow optical waveguide. The system further includes an optical source at an input of the optical path and an optical detector at an output of the optical path. A spectroscopic interaction between an analyte material that is introduced into the channel and an optical signal propagating along the optical path determines a characteristic of the analyte material.10-01-2009
20090238513WDM-Based Sensor System And Sensor Interrogation System - A WDM based sensor system, a method of interrogating a plurality of sensor elements, and a WDM based sensor interrogation system. The WDM based sensor system comprises a WDM MUX/DEMUX element for demultiplexing an optical input signal into a plurality of substantially non-overlapping signals in respective sensing channels; one or more sensor elements disposed in each sensing channel; wherein the MUX/DEMUX element multiplexes sensing signals from the respective sensing channels into an optical return signal; and a detector element for detecting the sensing signals in the multiplexed optical return signal.09-24-2009
20090232442Phase shift optical loop spectroscopy - The invention provides a method and apparatus for measuring one or more optical properties, such as absorbance and refractive index, of a test medium such as a gas, a liquid, or solid material. The method comprises providing a passive optical waveguide loop comprising the test medium, launching in the optical loop an intensity-modulated light at a reference phase, detecting a phase of said light along the optical waveguide loop, and comparing the detected phase of said light along the loop with the reference phase, wherein the comparison provides information about one or more optical properties of the test medium.09-17-2009
20090010589OPTICAL SENSOR BASED ON SURFACE ELECTROMAGNETIC WAVE RESONANCE IN PHOTONIC BAND GAP MATERIALS - A sensing method and apparatus using photonic band gap multilayered material. Photonic band gap multi-layers are formed from alternating layers of higher refractive index and lower refractive index materials, and may be deposited or disposed on a optically transparent substrate or a reflecting face of a prism. Light is directed into the prism, directed to the photonic band gap multilayer, and reflected out of the prism, where it is captured and analyzed. Various sensor configurations keep light wavelength or coupling angle fixed, while monitoring the change in the other parameter. Also disclosed is a microarray configuration with an array of probe spots placed on one surface of the multilayer, which is mounted on an x-y translation stage. Also disclosed is a configuration where a cylindrical lens focuses an expanded and collimated light beam to a line that transects the rows of array elements sequentially, producing an image with shifted surface electromagnetic wave modes for each row, corresponding to individual elements of the array row. Further disclosed is a PBG multilayer with a periodic grating structure in or on the terminating layer.01-08-2009
20090010588Optimized optical resonator device for sensing applications - An optical resonator is configured for optimized performance as a sensor by maximizing the slope and/or sharpness of the resonance peak, instead of maximizing the Q-factor of the resonator. These characteristics of the resonance peak are controlled, in accordance with the present invention, by modifying the physical parameters of the resonator structure (e.g., dimensions, spacing between waveguides, ring diameter, materials and associated refractive indices, etc.) until the desired peak attributes are achieved, regardless of the Q-factor associated with these optimum attributes.01-08-2009
20130163915DISTRIBUTED, MULTIPLEXED FIBER OPTIC CURRENT TRANSDUCER USING OPTICAL POWER DIVISION - A measurement system includes a broadband light source that outputs a broadband light, an optical splitter that divides the broadband light into a plurality of divided light beams and a plurality of optical sensors, each optical sensor configured to receive a single one of the divided light beams and measure an electrical parameter of a conductor.06-27-2013
20090022450DESIGN AND PERFORMANCE OF A FIBER BRAGG GRATING DISPLACEMENT SENSOR FOR MEASUREMENT OF MOVEMENT - A displacement sensor based on the underlying principle that when the outer surface of a quartz fiber (fiber optic cable) is etched to form a series of regularly spaced lines (a Fiber Bragg grating), laser light of a wavelength matching the spacing of the lines which enters one end of the fiber will be preferentially reflected. If the fiber is deformed, causing the line spacing to change, the wavelength of the reflected light will also change. This shift can be accurately measured and so can be related to the magnitude of the deformation of the fiber. This fiber is potted with epoxy resin in a narrow tube fabricated from a shape-memory alloy (SMA), and pre-formed into a curved shape. This not only protects the quartz fiber from direct contact with other objects and excessive bending, but also causes it to deform in a predictable fashion, thereby generating a reproducible response to displacement. Due to the high elastic behavior of the SMA tube, a displacement sensor with a gage length of 40 mm can measure displacements in excess of 3 mm.01-22-2009
20120328231FIBER SENSING SYSTEMS AND FIBER SENSING METHODS - A fiber sensing system is provided, including a plurality of ring structures, an optical coupler and a switching unit. Each of the ring structures has at least one fiber sensor to receive and reflect a light source signal. The optical coupler is directly connected to the ring structures thereby injecting the light source signal into the ring structures to form a plurality of loops. The switching unit is disposed in a central office having two output terminals coupled to the ring structure respectively by the optical coupler, thereby forming a first path and a second path in the loops, such that the light source signal is injected into the first path and the second path sequentially by the switching unit.12-27-2012
20090220188Fault Detection System - A fault detection system for subsea pipeline DEH cable includes fiber optic element(s) (09-03-2009
20090022451Optical Turnaround System - A technique is provided for utilizing an optical fiber in a variety of sensing applications and environments by beneficially routing the optical fiber. A continuous optical fiber is created to provide optical continuity between two ends of the optical fiber. The optical continuity is created with the assistance of an optical turnaround constructed in a simple, dependable form able to control the bend of the optical fiber as it extends through the optical turnaround.01-22-2009
20130022308MULTI-POINT PRESSURE SENSOR AND USES THEREOF - A sensing device for detecting a physical parameter exemplified by pressures, strains, temperatures, indices of refraction, and combinations thereof. The sensing device comprises a probe having a housing for sealably mounting therein an optical fibre. The optical fibre is provided at its distal end with at least two spaced apart fibre Bragg gratings. The proximal end of the probe is engagable with a holder, and is in communication with fibre Bragg grating interrogation systems. Spacers and seals may be provided about the optical fibre between the fibre Bragg gratings. An orifice may be provided and sealed with a resilient membrane to provide a contained airspace around each fibre Bragg grating. The contained airspace may be optionally filled with a fluid or a gas.01-24-2013
20090116782Novel optical sensor for measuring thin film disposition in real time - A novel optical sensor is used for monitoring the thickness of deposited thin film in real time. The sensor operates on the basic principle of a Fabry-Perot interferometer. A MEMS based design is used to fabricate the optical fiber sensor. Detail analytical results provide the theoretical model based on the Fabry-Perot interferometer, and show that the optical fiber sensor can successfully monitor and measure the thickness of deposited thin-film in real time. Since thin-film will be deposited simultaneously on both surfaces of sensor head and targeted silicon wafer, the sensor can be used in the fabrication of IC and MEMS devices j, as well as in proteomics, nano-sensors, and biosensors.05-07-2009
20110299807OPTICAL SENSORS AND METHODS OF MAKING THE SAME - A sensor is provided. The sensor includes a substrate, a waveguide having a first surface and a second surface, wherein the waveguide is disposed on the substrate such that at least a portion of the second surface of the waveguide is in physical contact with the substrate, a holder component disposed on at least a portion of the substrate, or the waveguide, or both, wherein the holder component comprises one or more cavities. The sensor further includes at least one microsphere at least partially disposed in a corresponding cavity of the holder component.12-08-2011
20090202193WAVEGUIDE CORE AND BIOSENSOR - A waveguide core made of hydrogel serves as an immobilization matrix having receptor molecules embedded therein.08-13-2009
20100104238SYSTEM AND METHOD FOR END-TO-END BEACONING - An embodiment of a method includes generating a command configured to cause activation of local beaconing at a selected device, and transmitting the command to the selected device. An embodiment of a system includes a processor, a memory including instructions executable by the processor, wherein the instructions cause the processor to generate a command configured to cause a selected device to activate local beaconing, a port connected to the selected device, and a transmitter operable to transmit the command to the selected device via the port.04-29-2010
20090067776OPTICAL FIBERS - One or more silica optical fibers (03-12-2009
20090080828Fibre Optic Sensor Array - A fibre-optic sensor array (03-26-2009
20080267555Plasmon-Polariton Refractive-Index Fiber Bio-Sensor with Fiber Bragg Grating - An optical waveguide sensing method and device in which a waveguide layer receives an optical signal and propagates the optical signal in accordance with a predetermined optical waveguide propagation mode. A testing medium surface in communication with the waveguide layer is responsive to a testing medium for modifying at least one characteristic of the propagated optical signal in relation to a given parameter of the testing medium. In this manner, the modified characteristic of the propagated optical signal can be measured in view of determining the given parameter of the testing medium.10-30-2008
20080260323NON-ELECTRONIC RADIO FREQUENCY FRONT-END WITH IMMUNITY TO ELECTROMAGNETIC PULSE DAMAGE - A non-electronic all-dielectric (NEAD) or non-electronic RF (NERF) front-end that exploits isolation features of photonics to eliminate metal electrodes, interconnects and the antenna. An electro-optic (EO) modulator is integrated with a dielectric resonance antenna to exploit unique isolation features of photonics. A doubly (RF and optical) resonant device design maximizes the receiver sensitivity. High-Q optical disk resonators and dielectric resonant antennas are integrated to create an efficient mixing of light and RF fields. The resulting non-electronic RF technology produces an all-dielectric RF front-end which provides complete isolation between the air interface and the ensuing electronic circuitry, enabling the creation of an RF receiver that is immune to high-power electromagnetic pulses (EMP) and High Power Microwave (HPM) pulses. The device can also be configured as a non-intrusive field probe that co-exists with a conventional receiver and detects a EMP or HPM attack.10-23-2008
20080260325Composite Evanescent Waveguides And Associated Methods - A composite evanescent waveguide can include a first structured dielectric layer and a second dielectric material oriented adjacent one another to form a wave propagation interface between the first structured dielectric layer and second dielectric material. Each of the first structured dielectric layer and second dielectric material are formed of materials such that the wave propagation interface can be capable of propagating an all-evanescent surface wave. The resulting propagating surface waves tend to have low losses and can be suitable for optical communications, surface analysis, sensors, and a variety of other applications.10-23-2008
20100086253 DISTRIBUTED TEMPERATURE SENSOR - A distributed temperature sensor (10) for cables configurations including at least one optical waveguide (12), the waveguide is constructed from a material with a predefined melting point, a light source (13) which is configured to emit light into the sensing optical waveguide (12), end a detector (14) configured to detect transmitted light intensity from the sensing optical waveguide (12) and an interlock module (15) configured to perform a shutdown of high power fiber coupled laser diodes (11), according to the signal detected by detector (14).04-08-2010
20110311179COMPARTMENTALIZED FIBER OPTIC DISTRIBUTED SENSOR - A distributed fiber optic sensor comprises a conduit having a plurality of sealed compartment extending along its length. A sensing optical fiber is disposed in the conduit and extends through the sealed compartment to form a series of separate sensing elements, each of which separately respond to a parameter of interest that is incident along the length of the conduit. The compartmentalized conduit is surrounding by a protective layer that includes ports therethrough to allow transmission of the parameter through the protective layer to the separate sensing elements.12-22-2011
20090087136Fibre Optic Sensor Package - A fibre-optic sensor package (04-02-2009
20090087134METHOD AND SYSTEM FOR OPTICAL DISTANCE AND ANGLE MEASUREMENT - A contactless precision, optical distance and angle measurement method and system optically measuring the position of a moveable object, the bending of the object, the torque applied to the object and the object's rotational velocity. The present invention includes a plurality of sectioned fiber optic placed around and adjacent to the moveable object that transmits optical signals to a surface of the object and receives the optic signals when a predefined marker or a reflective area is sensed. Another embodiment utilizes a sectioned optical assembly which, via alternate means, produces equivalent optical measurements. The received optic signals are then processed using mathematical computations that are facilitated through pre-characterization of the sensor response against a reflective material identical to that of the marker or reflective area.04-02-2009
20100080502OPTICAL FIBER SENSOR - An optical fiber sensor measuring refractive index of a medium with high sensitivity in a wide range. The optical fiber sensor includes an optical fiber causing a transmission loss due to leakage in the clad propagation mode from a portion of a core and a clad where a Bragg grating is provided, a light source permitting light in a wavelength band in the clad propagation mode to enter the optical fiber, and a light-receiving section receiving the transmitted or reflected light transmitted through the core and the clad at the portion where the Bragg grating is provided. The refractive index of the medium to be measured in contact with the clad is measured according to total intensity of the light received by the light-receiving section. The Bragg grating is inclined at a predetermined angle of inclination to the vertical line vertical to the length direction of the optical fiber.04-01-2010
20090285520OPTICAL SENSOR WITH DISTRIBUTED SENSITIVITY - A system and method for a structure monitoring and locating a disturbance event is disclosed. The system includes a compact transceiver chip sending optical signals in three optical fibers that encompass the monitored structure appropriately. The fiber arrangement has different density in different parts of the monitored structure, such as, for example, critical places in the structure may have larger number of fiber loops surrounding them. All fibers transmit signals in both directions: from the transceiver to a returning point and back. A set of two detectors registers the returning signals, and a time delay between those signals is calculated, which is indicative of the disturbance event location. Polarization states of the returning signals are controlled by transceiver built-in controllers. The event location is determined with different sensitivity in different parts of the monitored structure depending on the density of fibers in these parts.11-19-2009
20120106889BIOMIMETIC COMPOUND EYE OPTICAL SENSOR AND FABRICATING METHOD THEREOF - Provided is an optical sensor and an optical sensor fabricating method. The optical sensor includes: a substrate; and an ommatidia located on or inside the substrate, the ommatidia comprising a microlens which receives light, an optical waveguide which transfers the light received through the microlens, and a cone structure comprising a first end connected to the microlens and a second end connected to the optical waveguide, the cone structure having a diameter or a width decreasing in a direction from the first end to the second end.05-03-2012
20090257704GAS DETECTION APPARATUS USING OPTICAL WAVEGUIDE - Provided is a gas detection apparatus comprising an optical waveguide, wherein the optical waveguide comprises: a core formed on a substrate, the core having a refraction index of n10-15-2009
20090263070ATR-probe - An ATR-probe including: a housing having a media opening; a radiation guiding body closing the media opening and having two planparallel surfaces, between which light can be guided by means of total reflection. A section of a first planparallel surface bordered by a sealing ring can be contacted through the media opening with a medium to be measured. Transmission light conductors and receiving light conductors in the housing, wherein light is guided from the transmission light conductors, through the radiation guiding body, into the receiving light conductors; and wherein adjoining the first planparallel surface are first and second deflection surfaces, on which, respectively, light coupled into the radiation guiding body and light to be coupled out are deflected by total reflection, so that the light can be guided between the planparallel surfaces by means of total reflection. The light is not collimated, and the effective area of the transmission light conductors is smaller than the effective area of the receiving light conductors.10-22-2009
20090202192LOCATION MARKER FOR DISTRIBUTED TEMPERATURE SENSING SYSTEMS - Methods and apparatus for distributed temperature sensing (DTS) include marking one or more points at known locations along a waveguide or fiber of a distributed temperature sensing (DTS) system and applying position information from such marked locations to DTS measurements. A Bragg grating in the waveguide or fiber may provide a discrete marker for identification of the position information. Application of the position information from such marked locations to the DTS measurements avoids ambiguous interpretations of other inherent features to assess location and enables data analysis referenced by the known locations to correlate the DTS measurements in space.08-13-2009
20110170823FIBER OPTIC SENSOR FOR DETECTING MULTIPLE PARAMETERS IN A HARSH ENVIRONMENT - A fiber optic sensor is provided. The fiber optic sensor includes a fiber core having a plurality of grating elements wherein, the grating elements comprise a periodic or a quasiperiodic modulated microcrystalline and silicon dioxide tetrahedral structure and a cladding disposed about the fiber core.07-14-2011
20090103852ANALYZING ELEMENT AND ANALYZING APPARATUS USING SAME - An analyzing element (04-23-2009
20100111467MEASURING APPARATUS, VENTURI AND VENTURI INSERTION TOOL - This invention comprises a system for measurement of temperature and pressure in oil wells. It comprises a single hybrid mandrel housing a double pressure and temperature optical sensor, capable of measuring temperature and pressure both in the ring and in the production tubing of an oil well and an insertable venturi tube inserted in the direction of a pressure differential optical sensor, capable of taking flow rate measurements, the installation aspects of which are substantially simplified.05-06-2010
20080212917Fiber Optic Temperature and Pressure Sensor and System Incorporating Same - A sensing system including a sensor having an enclosure that defines a chamber, a fiber optic segment extending from outside the enclosure into the chamber, and a sequence of optical processing elements within the chamber. The elements include a fiber Bragg grating, a polarizer, a side hole fiber, and a mirror. A light source is arranged to direct light to the sensor(s). A spectral analyzer is arranged to detect light reflected back from the sensor(s). The fiber Bragg grating substantially reflects a first spectral envelope while transmitting the remainder of the optical spectrum to the polarizer and side hole fiber. The polarizer, side hole fiber, and mirror cooperate to return an optical signal within a second spectra! envelope. The characteristic wavelength of a peak in the first spectral envelope is highly sensitive to temperature and relatively weakly sensitive to pressure. The period of the optical signal within the second spectral envelope is highly sensitive to pressure and relatively weakly sensitive to temperature. The spectral analyzer measures these spectral components to simultaneously derive a measure of temperature and pressure that effectively compensates for temperature-pressure cross-sensitivity of the sensor(s).09-04-2008
20080212918Fiber Optic Sensor Device for Measuring Chromophoric Compounds in Biological Fluid - A fiber optic sensor device for detecting the presence of a chromophoric compound in a biological fluid is disclosed. The fiber optic sensor device includes at least one fiber optic member having an unclad portion, the fiber optic member having a proximal end and a distal end for transmitting light energy of a determinable wavelength, a light source means for generating light energy of determinable wavelength, said light source means operatively associated with a measuring means such that said light energy passes through said measuring means and said fiber optic member to the biological fluid, and measuring means operatively associated with said fiber optic member and said light source, for measuring the difference between said light energy generated by said light source and light reflected from the distal end of the fiber optic member, wherein the difference is related to the light absorbed by the chromophoric compound and indicative of the concentration of the chromophoric compound present in the biological fluid.09-04-2008
20100061678COMPACT FIBER OPTIC SENSORS AND METHOD OF MAKING SAME - A compact, optically double-ended sensor probes with at least one 180° bend provided in the optical fiber in close proximity to a fiber Bragg grating temperature sensor suspends the optical fiber within a casing in such a way that the expansion and contract of the probe casing will not materially influence the temperature reading of the fiber Bragg grating by adding time varying or temperature varying stress components.03-11-2010
20090003758Impact Resistant Optical Waveguide and Method of Manufacture Thereof - An impact resistant waveguide includes a clad surrounding a core. A reinforcing filler is incorporated in a curable silicone composition used to prepare the core, thereby imparting impact resistance to the core. A method of manufacture of the waveguide includes injecting the curable silicone composition into a clad made of silicone elastomeric tubing and thereafter curing the curable silicone composition.01-01-2009
20090034901OPTICAL FIBER SENSOR - An optical fiber sensor that can detect a liquid level or detect a property of liquid with high reliability even under a frequently vibrational environment. The optical fiber sensor includes an optical fiber that includes a core having an area where a grating is formed and a clad, and is disposed so that at least a part of the area with the grating is immersed in liquid, a light source for making light incident to the optical fiber so that a cladding mode light having a wavelength band is occurred by the grating, and a light receiving unit for detecting the intensity of light which is incident from the light source to the optical fiber and transmitted through the grating.02-05-2009
20100142880FIBER OPTIC SENSING SYSTEM - A fiber optic sensing system comprises a housing disposed in a flow path, and a fiber optic sensor. The fiber optic sensor comprises an optical fiber secured in the housing, a Bragg grating, a light source for transmitting light to the optical fiber, and a detector for detecting light filtered by the Bragg grating of the optical fiber and monitoring wavelength changes of the detected light. The fiber is substantially perpendicular to the flow path. The housing defines an opening at an upstream side to allow flow through the flow path to exert a pressure on the optical fiber and cause a deformation of the Bragg grating.06-10-2010
20090169151FERRULE FOR AN EVANESCENCE FIELD SENSOR LINE - A ferrule for an evanescence field sensor line is specified that has a lower part and a correspondingly attachable upper part. The upper and lower parts respectively have a recess substantially in the shape of a half shell in such a way that in the assembled state a guide tube is formed for holding an optical wavelength in a fashion enclosing the end face. A number of geometric structures for locally fixing the optical wavelength are respectively arranged in the recesses. Furthermore, a pressure sensor having such a ferrule is specified that contains an optical wavelength configured for pressure acquisition by influencing the assigned evanescence field, and at least one optoelectronic module. The ferrule is assigned to the optoelectronic module.07-02-2009
20080292237Methods and Apparatuses for Obtaining Information Regarding Sensors in Optical Paths - Methods and apparatuses for obtaining information, such as location and/or identification information, regarding sensors in optical paths such as optical fibers. One embodiment provides a method for identifying a location of a tag in an optical path. The tag is (1) adapted for producing a response to an optical signal propagating along the optical path; and (2) responsive to a variation of a physical parameter to vary the response to the optical signal. The method comprises causing a variation of the physical parameter and identifying the location of the tag at least in part by observing the response of the tag to the optical signal. The tag may be associated with a sensor such that a location of the sensor may be derived based on the location of the tag.11-27-2008
20080292238Temperature-Resistant Ir Measurement Probe - A temperature-resistant fibre-optic-coupled IR measurement probe and an FTIR measurement system with a connected temperature-resistant fibre-optic-coupled IR measurement probe are presented. The temperature stability is achieved by mounting the optical fibre sections (11-27-2008
20080292236Silicon photonic wire waveguide biosensor - Methods and devices relating to a sensor for use in detecting and monitoring molecular interactions. A silicon waveguide sensing element is provided along with a layer of silicon. A silicon oxide layer is also provided between the waveguide element and the layer of silicon. The sensing element is adjacent to an aqueous solution in which the molecular interactions are occurring. A light beam travelling in the silicon waveguide creates an evanescent optical field on the surface of the sensing element adjacent to the boundary between the sensing element and the aqueous medium. Molecular interactions occurring on this surface affect the intensity or the phase of the light beam travelling through the waveguide by changing the effective refractive index of the medium. By measuring the effect on the intensity, phase, or speed of the light beam, the molecular interactions can be detected and monitored in real time.11-27-2008
20080304787Waveguide Element, Method for Producing the Waveguide Element, and Optical Sensor - A waveguide element 12-11-2008
20080310790Nanowire-based photodetectors - Various embodiments of the present invention are directed to nanowire-based photodetectors that can be used to convert information encoded in a channel of electromagnetic radiation into a photocurrent encoding the same information. In one embodiment of the present invention, a photodetector comprises a waveguide configured to transmit one or more channels of electromagnetic radiation. The photodetector includes a first terminal and a second terminal. The first terminal and the second terminal are positioned on opposite sides of the waveguide. The photodetector also includes a number of nanowires. Each nanowire interconnects the first terminal to the second terminal and a portion of each nanowire is embedded in the waveguide.12-18-2008
20080310791All-fiber current sensor - Embodiments of the present invention provide a current sensing device. The current sensing device includes, inter alia, a three-by-three (3×3) optical coupler made of polarization-maintaining (PM) fibers and thus being a PM fiber coupler; a light source and at least one photon-detector connected to a first side of the 3×3 PM fiber coupler; and a fiber coil connected to a second side of the 3×3 PM fiber coupler. The 3×3 PM fiber coupler is adapted to split an input light from the light source into first and second optical signals while maintaining their respective polarization directions; and is adapted to cause coherent interference of third and fourth optical signals, related respectively to the first and second optical signals and received from the fiber coil.12-18-2008
20130216176SENSING SYSTEMS AND FEW-MODE OPTICAL FIBER FOR USE IN SUCH SYSTEMS - A sensing optical fiber comprising: a few-moded multi-segment core, said core comprising one core segment surrounded by another core segment, and at least one cladding surrounding said core; said core having an F factor (μm08-22-2013
20080247702Fiber optic generator condition monitor - A condition monitoring system for use in monitoring a generator. The condition monitoring system includes a sensor including an ion chamber located inside the generator for sensing particulates inside the generator. The sensor provides an electrical sensor output to an output converter that is also located inside the generator. The output converter converts the electrical sensor output to a light signal output which is transmitted out of the generator. An energy conversion device is located within the generator for receiving light energy from a light source outside of the generator and converting the light energy to electrical energy for powering the sensor and the output converter.10-09-2008
20100135608FIBER OPTIC TEMPERATURE & PRESSURE SENSOR & SYSTEM INCORPORATING SAME - A sensing system including a sensor having an enclosure that defines a chamber, a fiber optic segment extending from outside the enclosure into the chamber, and a sequence of optical processing elements within the chamber. The elements include a fiber Bragg grating, a polarizer, a side hole fiber, and a mirror. A light source is arranged to direct light to the sensor(s). A spectral analyzer is arranged to detect light reflected back from the sensor(s). The fiber Bragg grating substantially reflects a first spectral envelope while transmitting the remainder of the optical spectrum to the polarizer and side hole fiber. The polarizer, side hole fiber, and mirror cooperate to return an optical signal within a second spectral envelope. The characteristic wavelength of a peak in the first spectral envelope is highly sensitive to temperature and relatively weakly sensitive to pressure. The period of the optical signal within the second spectral envelope is highly sensitive to pressure and relatively weakly sensitive to temperature. The spectral analyzer measures these spectral components to simultaneously derive a measure of temperature and pressure that effectively compensates for temperature-pressure cross-sensitivity of the sensor(s).06-03-2010
20090190877MICROFLUIDIC DEVICE WITH MICROSTRUCTURE, AND SENSING SYSTEM AND METHOD USING SAME - A microfluidic device with microstructure includes a channel for accommodating an electrolytic solution therein and at least one microstructure formed in the channel. When an alternating-current signal is input to the microfluidic device so that a surface of the microstructure is polarized by a generated electric field, ions having polarity reverse to that of an electrolytic solution will migrate to the surface of the microstructure to form a field-induced electrical double layer to result in electro-osmotic flows at the corners at two sides of the microstructure, which causes formation of relatively fierce circular vortices in the solution. A sensing system and a sensing method using the microfluidic device with microstructure are also disclosed.07-30-2009
20090080827PRODUCTION DEVICE AND PRODUCTION METHOD FOR AN OPTICAL DEVICE COMPONENT HAVING A GRATING STRUCTURE - A production device and a production method for a grating-type optical component enabling formation of a variety types of FBGs using a single phase mask and an optical component made by the production method or production device for a grating-type optical component are provided. The method involves diffusing at least one of hydrogen or deuterium into an optical fiber and altering the refractive index of the optical fiber by irradiating the fiber with non-interfering UV lamp light.03-26-2009
20110013864In-line light sensor - The sensor includes an optical waveguide defined in a light-transmitting medium. The waveguide includes a sensing portion and an non-sensing portion. The light-transmitting medium included in the sensing portion has defects that provide the light-transmitting medium with a deep band gap level between a valence band of the light-transmitting medium and a conduction band of the light-transmitting medium. The deep band gap level is configured such that the waveguide guiding light signals through the light-transmitting medium in the sensing portion causes free carriers to be generated in the light-transmitting medium. A detector is configured to detect the free carriers in the sensing region of the waveguide.01-20-2011
20110268385OPTICAL WAVEGUIDE SENSOR AND MANUFACTURING METHOD OF THE SAME - An optical waveguide sensor includes a substrate and an optical waveguide. The optical waveguide includes a core and a lateral clad. The core extends in a spiral shape above a surface of the substrate. The lateral clad is disposed in a same layer as the core above the surface of the substrate and is in contact with either side surfaces of the core. At least a part of a surface of the core located opposite from the substrate is a transmission surface from which light leaks and is absorbed by a detected object.11-03-2011
20090123109TEMPERATURE SENSOR USING AN OPTICAL FIBER - A temperature sensor that has an elongated sensing element having a length of at least 10 m, measured at a temperature of 20° C. The elongated sensing element includes an elongated jacket and an optical fiber mounted in the jacket and having an EFL of at least 0.35%, wherein the elongated sensing element has an average temperature error of less than 2° C.05-14-2009
20090028490SIGNAL IDENTIFYING APPARATUS FOR AN OPTICAL FIBER - Provided is a signal identifying apparatus for an optical fiber that includes a detecting portion capable of detecting a signal originating from a first end of the optical fiber and a signal originating from a second end of the optical fiber. Additionally, the signal identifying apparatus includes an identifying portion that identifies a desired signal by separating the signal originating from the first end of the optical fiber from the signal originating from the second end of the optical fiber.01-29-2009
20090028489High speed fiber optic grating sensor system - A fiber optic grating sensor system is used to localize and measure the environment associated with high speed events including pressure, temperature, velocity and position. This system has the capability to provide timing and physical location markers allowing the character of a rapidly changing event to be accurately measured with specific reference to time and location of that event. The system consists of a fiber grating sensor assembly that may consist of a fiber grating array or chirped fiber grating. Markers are put in place by using short fiber gratings that either occupies a different spatial or spectral space so that environmental measurements can be accurately related to time and space. The reflective spectra can be interpreted rapidly through the use of spectral filters, the disappearance of the fiber grating assembly due to an energetic event or arrays of high speed detectors supported by dispersive elements.01-29-2009
20090052831Fiber optic position transducer with magnetostrictive material and position calibration process - Fiber optic position transducer that includes a magnetic or electromagnetic element, one or more segments of magnetostrictive material, Fiber Bragg Grating Sensors, a rod of material that is impenetrable to magnetic fields, optical fiber. One or more of the sensors is fixed upon a segment of magnetostrictive material, which is fixed to a rod, and may only be displaced longitudinally. The Fiber Bragg Grating Sensors have different wave lengths and are made of the same optical fiber. The magnetic or electromagnetic element included may be made of NdFeB (Neodymium Iron Boron) or metal alloys of TbDyFe (Terbium, Dysprosium and Iron), such as TX, Terphenol-D and others. It is applied to a control flow valve in an oil well, and it also refers to the calibration process of the position of the transducer.02-26-2009
20090245717SYSTEM AND METHOD FOR MEASURING STATOR WEDGE TIGHTNESS - Disclosed is a system for measuring stator wedge tightness in a stator core of an electric machine. The system includes at least one sensor located along at least one component disposed in a stator slot of the stator core. The at least one sensor is located and configured to measure strain in the component. The system further includes a data acquisition system operably coupled to the at least one sensor. A method for measuring stator wedge tightness in a stator core of an electric machine includes arranging at least one sensor along at least one component of the stator core, the at least one sensor being located and configured to measure strain in the component, and interrogating the at least one sensor utilizing a data acquisition system.10-01-2009
20090034902Method for Increasing Signal Intensity in An Optical Waveguide Sensor - A sensor platform for use in sample analysis comprises a substrate (02-05-2009
20090310902Optical Sensing Devices and Methods - An optical sensing system and method of using it includes a light source and a first bus waveguide having an input port that is in optical communication with the light source. The system further includes a microresonator configured so that the light source excites at least first and second resonant guided optical modes of the microresonator. The microresonator includes a first location on a surface of a core of the microresonator where a field intensity of the first mode is greater than a field intensity of the second mode. The microresonator core has a first cladding at the first location. The microresonator also has a second location on a surface of the core of the microresonator where a field intensity of the first mode is less than or equal to a field intensity of the second mode, the microresonator core having a second cladding at the second location. The first cladding is different than the second cladding.12-17-2009
20090097796Fiber-Optic Current Sensor With Sum Detection - To measure a sum of electrical currents in different conductors, light is led in an optical sensing fiber around all the conductors. The sensing fiber can be wound around the conductors in a single loop or in several individual loops. Interspersed polarization maintaining fibers and retarders can be used to transfer the light between individual loops for preventing undesired signals from stray magnetic fields. The method has high accuracy is particularly suited for measuring large currents that sum up to zero.04-16-2009
20090052830SILICON WAVEGUIDE PHOTODETECTOR AND RELATED METHOD - A photodetector device, comprises an optical input, a nanoscale silicon waveguide and an electrical output. The waveguide is a high-contrast waveguide, with a refractive index contrast with the outside environment of more that 10%. The optical mode distribution across the waveguide has a peak intensity in correspondence of surface states of the nanoscale silicon waveguide. A related method is also disclosed.02-26-2009
20090162003SINGLE MODE (SM) FIBER OPTICAL READER SYSTEM AND METHOD FOR INTERROGATING RESONANT WAVEGUIDE-GRATING SENSOR (S) - An optical reader system is described herein which has a single mode (SM) optical fiber launch/receive system that uses one or more SM optical fibers to interrogate a biosensor and does not use multimode (MM) optical fibers to interrogate the biosensor. The use of the SM optical fiber launch/receive system effectively reduces angular sensitivity, reduces unwanted system reflections, improves overall angular tolerance, and improves resonant peak reflectivity and resonant peak width. Two specific embodiments of the SM optical fiber launch/receive system are described herein which include: (1) a dual fiber collimator launch/receive system; and (2) a single fiber launch/receive system that interrogates the biosensor at a normal incidence.06-25-2009
20090208163HIGH-SENSITIVITY FIBER-COMPATIBLE OPTICAL ACOUSTIC SENSOR - An acoustic sensor includes at least one photonic crystal structure having at least one optical resonance with a resonance frequency and a resonance lineshape. The acoustic sensor further includes a housing mechanically coupled to the at least one photonic crystal structure. At least one of the resonance frequency and the resonance lineshape is responsive to acoustic waves incident upon the housing.08-20-2009
20090220189Transmitting Light with Lateral Variation - Input light, such as from an optical sensor or stimulus-wavelength converter, includes one or more light or dark sub-bands. The input light is transmitted, such as through a transmissive layer or transmission component, to obtain effects due to transmission with lateral variation. A detector can, for example, obtain spectral information or other photon energy information about the sub-bands due to lateral variation. For each light or dark sub-band, a transmission component can, for example, provide a respective light or dark spot, and spot position can be used to obtain spectral information such as absolute wavelength or wavelength change. A photosensing component can sense or detect transmitted light or output photons, such as with a photosensor array or a position-sensitive detector. Circuitry can use photosensed quantities to obtain, e.g. a differential signal or information about time of wavelength change.09-03-2009
20090154870Optical Fiber Sensor Connected To Optical Fiber Communication Line - An optical fiber sensor connected to an optical fiber communication line usable on an optical fiber communication line of the Internet etc. and able to share a communication line and a sensor line is provided. It has an optical fiber sensor line being an optical fiber (06-18-2009
20090220187RUGGED FIBER OPTIC TOWED ARRAY - A fiber optic towed array is provided. The array includes a flexible core upon which is disposed a semi-rigid mandrel. The semi-rigid mandrel has a helical groove formed therein, in which is disposed an optical fiber, the optical fiber including a plurality of fiber gratings. The mandrel is in turn covered with a nylon or fiber screen and encased in a layer of open cell foam, which is encased in a protective covering that includes at least one strength member disposed along a longitudinal axis of the array.09-03-2009
20080260324ACTIVE SENSOR, MULTIPOINT ACTIVE SENSOR, INSPECTION METHOD OF PIPE DETERIORATION AND INSPECTION APPARATUS OF PIPE DETERIORATION - An active sensor 10-23-2008
20090263069RAMAN AMPLIFICATION IN DISTRIBUTED OPTICAL FIBER SENSING SYSTEMS - A method of providing Raman amplification in an optical fiber sensing system, comprises generating a probe pulse of light and launching the pulse into a sensing optical fiber, generating pump light at a shorter wavelength and modulating it to produce a time-varying intensity profile, and launching the pump light into the sensing fiber. such that the intensity of the launched pump light during launch of the probe pulse is different from the intensity at other times. Raman amplification of backscattered light produced by the probe pulse as it propagates along the fiber is achieved, as is amplification of the probe pulse if the pump power is non-zero during launch of the probe pulse.10-22-2009
20090257705OPTICAL SENSOR - An optical sensor includes a light source, a sensing unit, a first optical fiber transmitting light from the light source to the sensing unit, second and third optical fibers transmitting the light from a reflecting surface of the sensing unit to light-receiving portions, and a calculation unit calculating physical quantities from electrical signals from the light-receiving portions. End surfaces of these fibers opposed to the reflecting surface are fixed so that the longitudinal direction thereof and the normal line of the reflecting surface form an angle θ, the second and third optical fibers are parallel to each other, and the fixing angles of the first optical fiber and the second and third optical fibers are symmetric about the normal line. These optical fibers have a single mode in the wavelength of which the optical fibers are used. A depolarizer is interposed between the light source and the first optical fiber.10-15-2009
20100150496Optical Chemical Detector and Method - An apparatus and method for optically detecting the presence of an analyte in a solution is presented. An embodiment comprises a waveguide resonator that is optically coupled to a fluid in a fluidic conduit so that the resonant wavelength of the waveguide resonator is based on the refractive index of the fluid.06-17-2010
20100002981Sensitive Emission Light Gathering and Flow Through Detection System - A method of detecting fluorescence/absorbance/luminescence from 24-well, 48-well, 96-well, 384-well and 1536-well microplates and other sample containers. The sample is pumped into a waveguide. The waveguide efficiently gathers and guides the emission light to the end of the waveguide. The emission light exits the ends of the waveguide and is focused into a detector. To minimize background caused by the excitation light used for fluorescence, the excitation illuminates the waveguides at 90 degrees. To facilitate reuse, the waveguide assembly can be configured to be washed by an appropriate wash solution.01-07-2010
20090116783OPTICAL SENSOR - An optical sensor (05-07-2009
20100166357Remote Optical Fiber Surveillance System and Method - In accordance with one aspect of the disclosed technology, wireless communications are used in a fiber surveillance system to enable monitoring of remote locations for vibrations, acoustic signals, stresses, stress fatigue or other detectable characteristics. A fiber that is deployed in the structure or region being monitored is connected a wireless transmitter that is used to transmit, to a receiving system, return optical signals obtained with the surveillance system. The return signals can be transmitted in raw form or after partial or total analysis.07-01-2010
20100183258Fiber sensing system with self-detection mechanism - The present invention discloses a fiber sensing system with self-detection mechanism which utilizes a central office to control secondary ring architecture formed by fiber sensor, remote node and optical coupler primarily. The secondary ring architecture is connected serially to form a primary ring architecture. The central office has a tunable laser light source that can deliver the light source to the fiber sensor. Since the fiber sensor has reflective ability, all light source signal sent by the tunable laser light source will be detected and measured by the fiber sensor. Thus central office can detect all signals reflected by the fiber sensor and produce a spectrum for analyzing fault point locations. The present invention can greatly enhance survivability and sensing capacity of all fiber sensors, so that when a fault point caused by environmental change within the fiber, it will not effect the overall operation of the sensing mechanism. The application of fiber sensor can also reduce cost and complexity of the overall fiber network topology.07-22-2010
20100189390ULTRA HIGH NUMERICAL APERTURE OPTICAL FIBERS - Various embodiments described include optical fiber designs and fabrication processes for ultra high numerical aperture optical fibers (UHNAF) having a numerical aperture (NA) of about 1. Various embodiments of UHNAF may have an NA greater than about 0.7, greater than about 0.8, greater than about 0.9, or greater than about 0.95. Embodiments of UHNAF may have a small core diameter and may have low transmission loss. Embodiments of UHNAF having a sufficiently small core diameter provide single mode operation. Some embodiments have a low V number, for example, less than 2.4 and large dispersion. Some embodiments of UHNAF have extremely large negative dispersion, for example, less than about −300 ps/nm/km in some embodiments. Systems and apparatus using UHNAF are also disclosed.07-29-2010
20110058767Reinforced Sensor With Optical Fiber Woven Into Fabric - A reinforced sensor with an optical fiber woven into a fabric, comprising a fabric formed in a manner that a weft yarn is woven thereinto in a direction substantially perpendicular to a warp yarn, wherein an optical fiber is included in at least either one of fibers of the warp yarn and the weft yarn. The optical fiber may function as a FBG sensor.03-10-2011
20090041404Fiber sensor production - The invention relates to a method of generating an ordered deposition geometry on a surface of a compound optical fibre, which comprises: (a) arranging a plurality of optical fibres and/or compound optical fibres in common orientation and close packed configuration to form a bundle; (b) drawing the bundle under suitable conditions to produce a compound optical fibre of desired diameter; (c) processing the compound optical fibre to produce a substantially planar surface; (d) subjecting said surface to an etching agent to produce surface relief (e) subjecting said surface with relief to metal coating. The invention also covers a compound optical fibre having an ordered deposition geometry on a substantially planar surface that is substantially transverse to compound optical fibre longitudinal axis, wherein the compound optical fibre comprises individual optical elements of less than about 1000 nm in diameter.02-12-2009
20090074347FIBER BRAGG GRATING FOR HIGH TEMPERATURE SENSING - A method of fiber core material band gap engineering for artificially modifying fiber material properties is provided. The method includes doping the fiber core material with one or more atoms for enhancing photosensitivity to the fiber material. The method also includes co-doping the fiber core material with one or more ions for enhancing an amorphous network crosslink mean coordination number. The method further includes thermally annealing the fiber core material for widening the band gap of the fiber core material.03-19-2009
20090074349FABRICATION OF FIBER OPTIC PROBES - A method of fabricating a sensor probe comprises: 03-19-2009
20090169150FIBER BRAGG GRATING AND FABRICATION METHOD - A method of fabrication of a thermally stabilized Type I fiber Bragg grating-based temperature sensing device includes doping a fiber core material with germanium or germanium oxide for enhancing photosensitivity, co-doping the fiber core material with fluorine or chorine or for increasing a mean coordination number; and ultraviolet laser inscribing a periodic or quasiperiodic modulated refractive index structure in the fiber core using a laser energy operating at less than 1000 milliJoules per square centimeter per pulse. The resulting sensor is operable for more than 1000 hours at temperatures up to at least 550 degrees Celsius.07-02-2009
20130129274OPTICAL FIBER HAVING A MODIFIED EXTERIOR PORTION THAT IMPROVES ADHESION TO AN EXTERIOR MATERIAL OR STRUCTURE, AND A METHOD FOR IMPROVING ADHESION CHARACTERISTICS OF AN OPTICAL FIBER - The shape of the exterior surface of a portion of an optical fiber that is to be attached to, or embedded in, an external structure or material is modified to improve the adhesion characteristics of that portion of the fiber. Improving the adhesion characteristics of that portion of the fiber allows a very strong bond to be formed between it and the structure or material to which it is attached or in which it is embedded. Strengthening this bond helps prevent relative movement from occurring between the fiber and the exterior material or structure to which it is attached or in which it is embedded.05-23-2013
20130129275Acousto-Ultrasonic Sensor - In one aspect, the present subject matter is directed to a sensor. The sensor includes an encapsulated fiber optic sensor and a ring shaped structure. The encapsulated fiber optic sensor passes through the ring shaped structure. The ring shaped structure is configured to resonate at a predetermined frequency.05-23-2013
20100322550OPTICAL FINGERPRINT NAVIGATION DEVICE WITH LIGHT GUIDE FILM - An optical finger navigation device. Embodiments of the optical finger navigation device include a light guide film (LGF) including a finger interface surface, a light source in optical communication with the LGF to provide light from the light source to the finger interface surface, a sensor, and a navigation engine. At least a portion of the LGF exhibits total internal reflection (TIR). The sensor detects light from the LGF in response to contact between a finger and the finger interface surface which modifies reflection of light out of the LGF to the sensor. The light detected by the sensor is changed over at least a portion of the sensor in response to the contact between the finger and the finger interface surface. The navigation engine is configured to generate lateral movement information indicative of lateral movement of the finger relative to the sensor, in response to the detected light.12-23-2010
20110026871SENSOR ELEMENT - In an embodiment, a sensor element is provided. The sensor element may include a light input configured to receive input light, a sample chamber configured to accommodate a sample, and at least one polymer waveguide optically coupling the light input with the sample chamber, the at least one polymer waveguide including a first contact portion and a second contact portion, wherein at least a portion of the second contact portion may be arranged in the sample chamber. The second contact portion may include a different structure than the first contact portion so that a change of the light intensity of the input light passing through the second contact portion may be caused due to an interaction between the input light passing through the second contact portion and the sample, wherein the change of the light intensity of the input light passing through the second contact portion may be different from the change of the light intensity of the input light passing through the first contact portion.02-03-2011
20090067777Pipeline security system - The present invention provides a security system for a pipeline, such as an oil, gas or water pipeline, or other tubular, elongated or other structures used to convey various other liquid, gaseous or fluent materials. The invention is also useful in protecting a tunnel such as a vehicular tunnel. A flexible and wrappable sensor sheet is provided having an optical fiber or electrical wire disposed therein in a zigzag or other pattern which covers substantially the entire area of the sheet. The sensor sheet containing the fiber or wire is wrapped around the outer surface of a pipeline or other structure, and provides a covering of substantially the entire outer surface of a predetermined length of the pipeline. Similar sheets can be employed on adjacent pipeline sections to provide protection of any intended length of the pipeline, which may include the entire effective pipeline length. The individual sensor sheets can be interconnected to provide one continuous optical or electrical path through the adjacent sensor sections for the entire pipeline length or any part thereof. A light or current source is provided at one end of the continuous path to introduce light or current into the path. A light or current detector is coupled to the other end of the path to sense light or electrical current from the path. Alternatively each sensor section can have its own light or current source and its own light or current detector for sensing a signal from the respective paths.03-12-2009
20110044576FIBRE OPTIC SENSOR - A fibre optic sensor for detecting or measuring the concentration of an analyte in a medium, the sensor having a sensing region (02-24-2011
20110044575Miniature Fiber Optic Temperature Sensors - An intensity-based fiber optic temperature sensor having a fiber probe with a multimode transmit/receive fiber, a reflector spaced apart from the end of the fiber, and a housing affixed at its ends to the fiber probe and reflector, the housing having a larger or smaller thermal expansion coefficient than those of the fiber probe and reflector. Temperature changes cause a change in the gap distance between the fiber end and the reflector, changing the amount of reflected light coupled into the optical fiber. Temperature sensors can also have a fiber probe with two or more multimode receiving fibers surrounding a transmitting fiber. Other temperature sensors include a fiber probe with a multimode transmitting fiber, a reference multimode receiving fiber and a sensing multimode receiving fiber for reducing noise effects.02-24-2011
20110044574METHODS AND SYSTEMS OF INSTALLING CABLE FOR MEASUREMENT OF A PHYSICAL PARAMETER - A method of installing a cable for the distributed measurement of a physical parameter, includes providing a cable adapted to measure a physical parameter at a plurality of points along the carrier tube, inserting the cable through a carrier tube, injecting a hardenable fluid into the carrier tube, and hardening the hardenable fluid material to be in a substantially solid state.02-24-2011
20090214154FIBER OPTIC DISTRIBUTED SENSOR APPARATUS - A distributed fiber optic sensor device that employs a photonic band gap fiber as a sensing medium, in which: the photonic band gap fiber, which is the sensing medium, includes: a quartz section; and a plurality of high refractive index portions provided in the quartz section along the longitudinal direction of the fiber, the high refractive index portions being photonic band gaps periodically arranged to form a triangular-lattice pattern; the photonic band gap fiber has a bandwidth in which a wavelength band of a Stokes beam generated due to stimulated Raman scattering is included; and the photonic band gap fiber has a band gap width in which a wavelength band of an anti-Stokes beam generated due to the stimulated Raman scattering and a wavelength band of an optical signal incident into the photonic band gap fiber are included.08-27-2009
20110116735Retro-Reflective Structures - A photonic integrated circuit (05-19-2011
20110085758METHOD OF MANUFACTURING OPTICAL SENSOR MODULE AND OPTICAL SENSOR MODULE OBTAINED THEREBY - A method of manufacturing an optical sensor module which eliminates the need for the operation of alignment between a core in an optical waveguide section and an optical element in a substrate section and which achieves improvement in alignment accuracy and reduction in costs, and an optical sensor module obtained thereby. An optical waveguide section W04-14-2011
20090263071Optical environmental sensor and method for the manufacturing of the sensor - A sensor which reacts on influences from an environment. The sensor includes a zero-order diffractive color filter. The zero-order diffractive color filter includes a high-index waveguide layer, a zero-order diffractive grating structure and a layer of an reactive material, wherein the reactive material is in contact with the environment and wherein the reactive material changes its optical properties upon interaction with the environment. The reactive material is embedded in the waveguide layer and/or the reactive material is located at a maximum distance d from the waveguide layer. The distancing is effected by an intra layer having a low index of refraction.10-22-2009
20100008618Modulated optical waveguide sensor - The present invention provides both materials and processes that use an optical transduction technique employing modulation of a biological recognition event at the surface of a waveguide. This approach relies on fluorescence of a reporter material, such as a dye, that is attached to a recognition molecule whose position relative to the surface of a waveguide, e.g., a planar optical waveguide, is modulated by electric, magnetic or acoustic fields or a combination of such fields.01-14-2010
20100054657INTRUSION DETECTION SYSTEM FOR USE ON SINGLE MODE OPTICAL FIBER USING A COST REDUCED POLARIMETER - A telecommunications optical fiber is secured against intrusion by detecting manipulation of the optical fiber prior to an intrusion event. This can be used in a non-locating system where the detection end is opposite the transmit end or in a locating system which uses Fresnel reflections and Rayleigh backscattering to the transmit end to detect and then locate the motion. The Rayleigh backscattering time sliced data can be stored in a register until an intrusion event is detected. The detection is carried out by a polarization detection system which includes an optical splitter which is manufactured in simplified form for economic construction. This uses a non-calibrated splitter and less than all four of the Stokes parameters. It can use a polarimeter type function limited to linear and circular polarization or two linear polarizers at 90 degrees.03-04-2010
20100061677FLEXURAL DISC FIBER OPTIC SENSOR AND METHOD OF FORMING SAME - A fiber optic sensor employs at least two flexural discs that are spaced apart from one another along a central axis. A fiber optic coil is affixed to at least one of the flexural discs. A proof mass is disposed between the flexural discs. A first stop member is disposed between the proof mass and one flexural disc. A second stop member is disposed between the proof mass and the other flexural disc. The first and second stop members are sized to provide space between the proof mass and the corresponding flexural disc to allow for normal motion of the flexural discs, while interfering with movement of the flexural discs to prohibit unwanted extreme motion. The fiber optic sensor can be used for OTDR measurements of acceleration for real-time oilfield monitoring applications as well as other fiber-based interferometric measurement applications. A coupling structure preferably couples the outer edges of the flexible disks, the mass being attached to the coupling structure.03-11-2010
20110176763SYSTEMS AND METHODS FOR SENSING PROPERTIES OF A WORKPIECE AND EMBEDDING A PHOTONIC SENSOR IN METAL - Systems and methods for sensing properties of a workpiece and embedding a photonic sensor in metal are disclosed herein. In some embodiments, systems for sensing properties of a workpiece include an optical input, a photonic device, an optical detector, and a digital processing device. The optical input provides an optical signal at an output of the optical input. The photonic device is coupled to the workpiece and to the output of the optical input. The photonic device generates an output signal in response to the optical signal, wherein at least one of an intensity of the output signal and a wavelength of the output signal depends on at least one of thermal characteristics and mechanical characteristics of the workpiece. The optical detector receives the output signal from the photonic device and is configured to generate a corresponding electronic signal. The digital processing device is coupled to the optical detector and determines at least one of the thermal characteristics and mechanical the characteristics of the workpiece based on the electronic signal.07-21-2011
20090028488FABRICATION OF NANOWIRES - A method of forming a nanowire is disclosed. In one embodiment, a primary preform is formed comprising at least one central region and a support structure. The primary preform is then drawn to a cane, which is then inserted into an outer portion, to form a secondary preform. The secondary preform is then drawn until the at least one central portion is a nanowire. The method can produce nanowires of far greater length than existing methods, and can reduce the likelihood of damaging the nanowire when handling.01-29-2009
20110075963MICRO-RESONATOR SENSOR USING EVANESCENT WAVE OF TOTAL REFLECTION MIRROR - A micro-resonator sensor using an evanescent wave of a total reflection mirror is disclosed. A main waveguide includes an input hole to which a optical signal is inputted and an output hole from which the optical signal is outputted, and a optical coupling region at which a portion of the optical signal inputted through the input hole is branched. A resonant waveguide includes a optical coupling waveguide optically coupled with the optical coupling region of the main waveguide to receive the branch optical signal branched from the main waveguide and a plurality of circumferential waveguides. The optical coupling waveguide and the plurality of circumferential waveguides are disposed in a polygonal shape. Optical path changing units are disposed at vertex regions to which the optical coupling waveguide and the circumferential waveguides are connected to reflect at least a portion of the branch optical signal inputted to the resonant waveguide so as to turn around within the resonant waveguide. At least one of the optical path changing units disposed at the vertex regions to which the circumferential waveguides are connected is a total reflection mirror with a receptor provided on the other side from the side on which the branch signal is inputted and combining with a measurement-subject material. The circumferential waveguide that inputs the branch optical signal to the total reflection mirror is disposed such that an incident angle relative to the total reflection mirror is larger than a total reflection threshold angle. Because the resonator is configured by using the total reflection mirrors, the micro-resonator sensor can be fabricated with an ultra-compact size without an excessive radiation loss. Also, because all the elements are integrated on a single wafer, the micro-resonator sensor can be fabricated as an on-chip, whereby an ultra-compact optical sensor module applicable to mobile terminals can be manufactured.03-31-2011
20110075962WAVEGUIDE COUPLED SURFACE PLASMON POLARITION PHOTO DETECTOR - A metal-semiconductor-metal (MSM) device couples light from an optical mode in a waveguide to a surface plasmon polarition (SPP) mode on an electrode surface of the MSM device. Once in an SPP mode, the absorption of light in the semiconductor can take place in a very small area. This may allow for a shrinking of the active detector area and allow for low capacitance, very short transit distance for the electrical carriers and allow for very low voltage devices and/or very high frequency.03-31-2011
20100080500FIBEROPTIC CLEARANCE DETECTION SYSTEM AND METHOD - A fiberoptic system for clearance detection between rotating and stationary turbomachinery components is presented. The system comprises an optical fiber probe comprising a plurality of optical fibers, at least one of the optical fibers comprising a transmission fiber and at least one of the optical fibers comprising a signal fiber; a light source for providing light through the transmission fiber towards a target; filters for receiving light from the signal fibers, at least two of the filters for filtering different wavelengths; and at least one photodetector for receiving filtered light from the filters.04-01-2010
20120201490OPTICAL SENSOR MODULE - An optical sensor module is provided in which an engagement portion of a board unit is fitted in a groove of an optical waveguide unit and, even with the single engagement portion, the board unit is stably supported. An optical sensor module includes an optical waveguide unit, and a board unit mounted with an optical element and coupled to the optical waveguide unit. The optical waveguide unit includes a single edge extension portion axially extending along one side edge of an over-cladding layer, a board unit engagement groove provided in the single edge extension portion, and a projection provided on a side wall of the vertical groove and kept in abutment against an engagement portion of the board unit. The board unit includes an engagement portion fitted in the vertical groove, which abuts against the projection within the vertical groove.08-09-2012
20090022449FIBER OPTIC SENSOR AND METHOD FOR MAKING - A fiber optic sensor including a fiber having a modified surface integral with the fiber wherein the modified surface includes an open pore network with optical agents dispersed within the open pores of the open pore network. Methods for preparing the fiber optic sensor are also provided. The fiber optic sensors can withstand high temperatures and harsh environments.01-22-2009
20120201489FIBEROPTIC CLEARANCE DETECTION METHOD AND OPTICAL FIBER PROBE USED THEREIN - A method includes transmitting light through at least one transmission optical fiber towards a target, receiving light reflected from the target through at least one signal optical fiber, filtering the received light at least two different wavelengths, and using the filtered light to detect a clearance variation. An optical fiber probe includes a plurality of optical fibers, a moisture-resistant enclosure enclosing the optical fibers, a hydrophobic layer situated over an end of the optical fiber probe for preventing moisture from reaching the optical fibers, and a broadband transmission layer between ends of the optical fibers and the hydrophobic layer.08-09-2012
20120177319OPTICAL FIBER SENSOR AND METHODS OF MANUFACTURE - A superstructure fiber Bragg gratings (FBG) by laser-assisted direct writing of on-fiber metallic films. A laser direct write method is used to fabricate periodic films of silver nanoparticles on the non-planar surface of as-fabricated FBGs. Silver films with a thickness of about 9 μm are fabricated around a Bragg grating optical fiber. The performance of the superstructure FBG is studied by applying temperature and tensile stress on the fiber. An opto-mechanical model is also developed to predict the optical response of the synthesized superstructure FBG under thermal and structural loadings. The reflectivity of sidebands in the reflection spectrum can be tuned up to 20% and 37% under thermal and structural loadings, respectively. In addition, the developed superstructure FBG is used for simultaneous measurement of multiple criteria such as force and temperature to eliminate the inherent limitation of regular FBGs in multi-parameter sensing.07-12-2012
20110026870PHOTONIC CRYSTAL FIBER SENSOR - Systems and methods for sensing a target analyte. An example sensor includes a tunable light source that provides a substantially single optical mode of light, a detector, a processor, and a resonator. The resonator resonates light provided by the light source at a predefined frequency. The resonator includes a photonic crystal fiber having a solid region that guides a substantially single optical mode of light and at least one hollow channel adjacent to the solid region. The hollow channel receives a fluid from an external source. The hollow channel is coated with a film having a material that is reactive with the target analyte in a manner that changes the optical properties of the film. The detector detects light from the resonator. A predetermined change in the detected signal as determined by the processor indicates presence of the target analyte. The material in the film is reversible.02-03-2011
20110026873MANUFACTURING METHOD OF OPTICAL SENSOR MODULE AND OPTICAL SENSOR MODULE OBTAINED THEREBY - A method of manufacturing an optical sensor module which eliminates the need for the operation of alignment between a core in an optical waveguide section and an optical element in a substrate section, and an optical sensor module obtained thereby. An optical waveguide section W02-03-2011
20110026872DEVICE FOR APPLYING A FIBER-OPTIC MONITORING SYSTEM TO A COMPONENT TO BE MONITORED - An adapter device for applying a fiber-optic monitoring system to a component to be monitored includes a shell adapted to surround the component to be monitored, the shell having a rounded exposed surface onto which a first optical fiber of the fiber-optic monitoring system can be wrapped.02-03-2011
20110085759COMPOSITE THIN FILM, AND ATMOSPHERE SENSOR AND OPTICAL WAVEGUIDE SENSOR EACH INCLUDING THE SAME - Disclosed is a composite thin film that can be expanded in surface area of an organic compound film having a surface, on which specific molecules are adsorbed, can increase the number of reactive sites per single layer of the organic compound film, and can be produced with a low number of laminations, and is excellent in productivity. The composite thin film is furthermore excellent in applicability in enabling reactive sites to be modified with a functional molecule to enable application to sensors of high sensitivity and molecular devices, etc., of improved function. The composite thin film is formed on a surface of a support and is characterized in that the composite thin film has at least one layer of each of the following films of (a) and (b) on the surface of the support. That is, (a) a microparticle film formed by adsorption of microparticles, and (b) an organic compound film formed by adsorption of an organic compound.04-14-2011
20110135247Fiber Splice Housing - Splicing optical fibers from cables running along an infrastructure involves passing the cables into a housing (06-09-2011
20110135244Filtered fiber optic probe - A fiber optic probe assembly which incorporate a series of graduated shaped and nestable members, e.g. cylindrical annular members which enable uniform and repetitive construction and assembly of the probes resulting in a high degree of quality control.06-09-2011
20110135245MICROHOLE-STRUCTURED LONG PERIOD FIBER GRATING - An optical fiber with long period fiber gratings includes an optical fiber axis, a core region extending along the fiber axis, the core region having a core refractive index, a cladding region surrounding the core region, the cladding having a cladding refractive index, and a plurality of microholes perpendicular to the fiber axis with a portion of the core region removed, the plurality of microholes are spaced apart by a grating period.06-09-2011
20110135246BEND INSENSITIVE OPTICAL FIBER WITH IMPROVED HYDROGEN RESISTANCE - An optical fiber includes: a core including a photosensitive material disposed therein, the core having a first index of refraction; a depressed cladding surrounding the core and having a second index of refraction that is lower than the first index of refraction; and an outer cladding surrounding the depressed cladding and having a third index of refraction that is higher than the depressed cladding.06-09-2011
20110052116SHAPE MEMORY SENSOR - The invention relates to a sensor for measuring an environmental effect, comprising a sensor material having an internal stress, which sensor material is designed to at least partially relax under the influence of the environmental effect. The sensor further comprising a detection unit for indirectly or directly detecting said relaxation. The invention also relates to a waveguide, comprising a grating in at least a portion of the waveguide, which waveguide comprises a coating, the coating comprising a polymer that contains reversible crosslinks that can be broken by the environmental effect in such a way that the polymer changes shape. The invention further relates to a sensor system comprising a waveguide, a light source, and a photo-detector.03-03-2011
20110052115SYSTEM AND METHOD FOR TEMPERATURE CONTROL AND COMPENSATION FOR FIBER OPTIC CURRENT SENSING SYSTEMS - A fiber optic sensor system employs at least one light source that operates to generate light having one or more desired wavelengths. A first optical fiber based sensor transparent to a desired light wavelength operates to sense a magnetic field emitted from a predetermined electrical conductor or a current flowing through the electrical conductor. A temperature sensor that may be another optical fiber based sensor operates to sense an operating temperature associated with the first optical fiber based sensor in response to the light generated by the light source. Signal-processing electronics adjust the sensed current to substantially compensate for temperature induced errors associated with the sensed current in response to the measured operational temperature of the fiber optic sensor.03-03-2011
20110097031Optical sensor interrogation system - Apparatus and a method for monitoring various conditions of a vehicle structure including an optical sensor comprising an optical fiber bearing a photonic crystal mounted to one end, an interrogation system including an optical signal generator interfacing with one or more of the optical sensors located remotely from the interrogation module, and a method of monitoring the vehicle structural health using the interrogation system.04-28-2011
20110097032MODALMETRIC FIBRE SENSOR - A modalmetric fibre sensor comprises a multimode sensor fibre (04-28-2011
20100166359OPTICAL WAVEGUIDE MODE SENSOR HAVING PORES - A chip is constituted from a transparent substrate, a reflector film formed on the transparent substrate and an optical waveguide layer formed on the reflector film, and a plurality of pores is formed in the optical waveguide layer. A light-introducing mechanism that introduces light from the transparent substrate of the chip onto the reflector film, and a light-detecting mechanism that detects the light reflected on the reflector film are provided. A specimen under investigation is detected by sensing a change in the incidence angle or in the intensity of reflected light that occurs when the specimen is adsorbed or deposits on the surface of the optical waveguide layer, by using a range of incidence angles of the light in which the intensity of reflected light changes when a part or all of the incident light couples with the optical waveguide mode that propagates in the optical waveguide layer.07-01-2010
20100166358Dual Fiber Grating and Methods of Making and Using Same - A multiple-layer fiber-optic sensor is described with dual Bragg gratings in layers of different materials, so that the known temperature and strain response properties of each material may be utilized to simultaneously correct the sensor output for temperature and strain effects.07-01-2010
20100158432FIBER OPTIC SENSOR APPARATUS - A fiber optic sensor apparatus includes an optical fiber, a fiber bend holder, and a sensing element. The optical fiber can be configured to form a transmit fiber path and a return fiber path by adhering the fiber bend holder to the center of the optical fiber in order to form a straight section between the transmit fiber path and the return fiber path. The optic fiber can be physically bent and adhered to tabs associated with the fiber bend holder. A cut can be precisely made in the center of the adhered straight section and the sensing element can be inserted into an optical path associated with the optical fiber.06-24-2010
20100067844RADIOLOGICAL AND NUCLEAR OPTICAL SENSOR - Optical systems for sensing radiation emissions from radiological and nuclear matter. An example system includes a light source, a light sensor, a processing device in signal communication with the light source and the light sensor, and a fiber optic cable that receives light from the light source and delivers light to the light sensor. The fiber optic cable includes an optical fiber core region surrounded by a cladding region. The optical fiber is a single mode optical fiber having a mode field diameter greater than 25 μm. The optical fiber cladding region includes a plurality of lengthwise holes positioned to provide single mode light propagation properties. The plurality of lengthwise holes have a diameter between 0.1-5 μm.03-18-2010
20110182544OPTICAL FIBER SENSOR - An optical fiber sensor may include an optical fiber configured to receive a light having a first frequency from a light source and to transmit the light through the optical fiber, the transmitted light having the first frequency and a second frequency which is generated by stimulated Brillouin scattering (SBS), a photodetector configured to receive the transmitted light from the optical fiber and to convert the transmitted light into an electric signal and a sensing circuit configured to calculate an average squared value of the electric signal received from the photodetector, which is dependent on a frequency difference between the first frequency and the second frequency.07-28-2011
20100027937THREE-DIMENSIONAL SENSOR OPTICAL WAVEGUIDE, AND THREE-DIMENSIONAL SENSOR EMPLOYING THE SAME - A three-dimensional sensor optical waveguide which permits size reduction, and a three-dimensional sensor employing the same. A three-dimensional sensor optical waveguide includes a plurality of frame-shaped optical waveguide members stacked coaxially in a thickness direction, and a measurement space defined by inner spaces of the stacked frame-shaped optical waveguide members. The optical waveguide members each include a light emitting core, a light receiving core and an over-cladding layer covering the cores. The light emitting core has a light output end positioned in one of opposed inner edge portions of each of the frame-shaped optical waveguide members. The light receiving core has a light input end positioned in the other inner edge portion of each of the frame-shaped optical waveguide members.02-04-2010
20110216996Distributed Fibre Optic Sensing for Event Detection - A fibre optic sensing method and apparatus for determining location and direction information of disturbances occurring in the environment of a sensor optical fibre are provided. The method comprises launching optical pulses into at least one polarisation eigenmode of a polarisation maintaining fibre as the sensor optical fibre, detecting temporal speckle patterns of light backscattered from the at least one polarisation eigenmode of the fibre, comparing the temporal speckle patterns to determine the location and direction information of a disturbance in the environment of the sensor optical fibre. The location information may be a distance along the fibre, and the direction information may be a direction radially from the axis of the fibre. The apparatus or instrument may be used to detect disturbance over long distances such as pipes, pipelines, or wells. Other applications include detecting intruders entering a controlled area.09-08-2011
20110216995METHOD OF MANUFACTURING OPTICAL SENSOR MODULE AND OPTICAL SENSOR MODULE OBTAINED THEREBY - A method of manufacturing an optical sensor module which eliminates the need for the operation of alignment between a core in an optical waveguide unit and an optical element in a substrate unit and which does not reduce the accuracy of alignment, and an optical sensor module obtained thereby. An optical waveguide unit including protruding portions having vertical walls with a height less than 50 μm and groove portions, and a substrate unit including positioning members of respective positioning plate portions to be positioned in the protruding portions and fitting plate portions for fitting engagement with the groove portions are individually produced. Corners of the positioning members are positioned on the vertical walls of the protruding portions, and the fitting plate portions are brought into fitting engagement with the groove portions whereby the substrate unit and the optical waveguide unit are integrated together.09-08-2011
20090202194OPTICAL MEASURING DEVICE FOR DETERMINING TEMPERATURE IN A CRYOGENIC ENVIRONMENT AND WINDING ARRANGEMENT WHOSE TEMPERATURE CAN BE MONITORED - An optical measuring device for determining temperature in a cryogenic environment includes at least one optical waveguide provided with at least one fiber Bragg grating sensor that is interrogated by a light signal. The device includes a light injector that injects light into the at least one fiber Bragg grating sensor, and an evaluation unit that determines a temperature value from the modulated light signal emanating from the at least one fiber Bragg grating sensor. The device includes at least one jacket that non-rigidly encloses the optical waveguide, at least in the region of the at least one fiber Bragg grating sensor. The jacket has a larger coefficient of thermal expansion, at least at cryogenic temperatures, than the optical waveguide. A winding arrangement for use in a cryogenic environment is provided with such a device for temperature monitoring of a conductor of the winding arrangement.08-13-2009
20090238514OPTICAL WAVEGUIDE HAVING GRATING AND METHOD OF FORMING THE SAME - An optical waveguide and process for forming an optical waveguide are provided. The optical waveguide includes a first cladding layer; a first waveguide core formed on the first cladding layer, the first waveguide core comprising a first long period grating formed in at least one sidewall of the first waveguide core; and a second cladding layer formed over the first waveguide core. The process for forming an optical waveguide includes forming a first waveguide core on a surface of a first cladding layer; patterning the first waveguide core with a long period grating that is perpendicular to a surface of the first cladding layer; and forming a second cladding layer on the first cladding layer so as to cover the first waveguide core.09-24-2009
20100290733FIBER BRAGG GRATING SENSING PACKAGE AND SYSTEM FOR GAS TURBINE TEMPERATURE MEASUREMENT - A fiber Bragg grating multi-point temperature sensing system comprises a fiber sensing cable package and a plurality of clamping devices distributed along an inner surface of a wall in a circumferential direction for securing the fiber sensing cable package. The fiber sensing cable package comprises a fiber Bragg grating based sensing cable comprising at least one optical fiber, a plurality of Bragg gratings inscribed in the optical fiber, and a fabric layer and a sheath tube surrounding the optical fiber. The multi-point fiber temperature sensing system comprises a light source for transmitting light to the Bragg gratings based sensing cable package, and a detector module receiving reflected signal. Each clamping device comprises a radiation tee and defines at least one mounting hole for securing the fiber sensing cable.11-18-2010
20120039561HIGH TEMPERATURE FIBER OPTIC TURNAROUND - A sensing cable includes a pair of sensing fibers that are connected to one another by a U-shaped turnaround section. The turnaround section is a section of sensing fiber coated with a jacket that includes metallic components. The turnaround section is bent and, then, annealed according to a method of the present invention. The turnaround section is robust and reduced in size (i.e., radius). The sensing cable also includes an inner sleeve that surrounds the sensing fibers and an elongated outer armor casing (i.e., including an armor tube and a sealing cap) that encases a terminating end thereof. The armor tube and the sealing cap protect the sensing fiber from mechanical and chemical harm, are reduced in size and facilitate insertion of the sensing cable into downhole environments. The sensing cable has improved operating range up to 300° C.02-16-2012
20090129721FIBER OPTIC GAS SENSOR - A gas sensor includes an in-fiber resonant wavelength device provided in a fiber core at a first location. The fiber propagates a sensing light and a power light. A layer of a material is attached to the fiber at the first location. The material is able to absorb the gas at a temperature dependent gas absorption rate. The power light is used to heat the material and increases the gas absorption rate, thereby increasing sensor performance, especially at low temperatures. Further, a method is described of flash heating the gas sensor to absorb more of the gas, allowing the sensor to cool, thereby locking in the gas content of the sensor material, and taking the difference between the starting and ending resonant wavelengths as an indication of the concentration of the gas in the ambient atmosphere.05-21-2009
20120002913PHOTONIC CRYSTAL SENSOR - This invention relates to an optical sensor element comprising a photonic crystal constituted by a membrane of a chosen transparent material, the membrane being provided with a number of defined openings in a chosen pattern, the pattern being adapted to provide resonance at a chosen wavelength or range of wavelengths, wherein said openings are provided with a reactive material acting as a receptor for a chosen type of molecules, e.g. proteins, the presence of which alters the resonance and/or scattering conditions in the sensor element thus altering the amount of light propagating out of the membrane plane.01-05-2012
20120014638OPTICAL WAVEGUIDE SENSOR CHIP, OPTICAL WAVEGUIDE SENSOR, AND METHOD FOR MANUFACTURING OPTICAL WAVEGUIDE SENSOR CHIP - According to one embodiment, an optical waveguide sensor chip includes an optical waveguide layer; a pair of optical elements disposed at both ends of the optical waveguide layer so that light enters the optical waveguide layer and the light exits from the optical waveguide layer; a functional film formed on a predetermined region of the optical waveguide layer; a covering layer formed in a planar region on the light entrance surface of the optical waveguide layer, in which at least the optical elements are disposed; a first through hole configured to allow the light entering the entrance-side optical element to pass therethrough; and a second through hole configured to allow the light exiting from the exit-side optical element to pass therethrough.01-19-2012
20120014637Shock detection optical fiber sensor - A shock detection optical fiber sensor includes: a plastic fiber; a corrugated plate having a plurality of protrusions arranged in the longitudinal direction of the plastic optical fiber and formed to oppose to the plastic optical fiber; a mold plate covering the plastic optical fiber and the corrugated plate; a light emitting element connected to one end of the plastic optical fiber; and a light receiving element connected to the other end of the plastic optical fiber.01-19-2012
20090067775FIBER OPTIC CHEMICAL SENSOR - Optical systems for sensing chemicals. An example system includes a light source, a light sensor, a processing device in signal communication with the light source and the light sensor, and a fiber optic cable that receives light from the light source and delivers light to the light sensor. The fiber optic cable includes a cladding material that is permeable to a predefined substance and an optical fiber core surrounded by the cladding material. The optical fiber core is a single mode optical fiber having a diameter greater than 30 μm. The optical fiber core includes a hollow center having a diameter between 1-50 μm. The optical fiber core includes a plurality of lengthwise holes positioned to provide single mode light propagation properties. The plurality of lengthwise holes have a diameter between 0.2-4 μm.03-12-2009
20120301072OPTICAL FIBRE SENSOR ASSEMBLY - An optical fibre sensor assembly comprises a source of a plurality of different frequency substantially monochromatic signals (11-29-2012
20090103851SURFACE PLASMON RESONANCE FIBER SENSOR - A Surface Plasmon Resonance (SPR) fiber sensor is disclosed, which comprises an optical fiber member and a plurality of optical fiber sensing units. Each of the plurality of the optical fiber sensing units comprises a cladding layer, a core layer, and a groove, and the plurality of the optical fiber sensing units is arranged into a cascade form matrix. In each of the optical fiber sensing units, the cladding layer is located at the periphery of the core layer, and the maximum depth of the groove is larger than the thickness of the cladding layer. An SPR sensing apparatus is also disclosed, which includes a light source, an optical signal detector, a plurality of fibers, and a plurality optical fiber sensing units. Besides, the optical fiber sensing units, the light source, and the optical signal detector are connected with each other through the plurality of fibers.04-23-2009
20110091150EVANESCENT WAVE MULTIMODE OPTICAL WAVEGUIDE AND SENSOR WITH CONTINUOUS REDISTRIBUTION OF OPTICAL POWER BETWEEN THE MODES - There is provided an evanescent wave multimode optical waveguide sensitive to a chemical species or to a physical parameter. The optical waveguide comprises a core and a cladding having a cladding refractive index lower than that of the core for guiding light to be propagated in the optical waveguide. The cladding defines with the core an optical waveguide providing mode coupling. A chemical indicator is provided in the cladding for causing a variation of the optical absorption of the cladding as a function of the chemical species or the physical parameter. The cladding is interrogated by the evanescent wave of the propagated light. The mode coupling causes unabsorbed light power to be redistributed among the multiple modes while light propagates along the optical waveguide.04-21-2011
20110091149POLING STRUCTURES AND METHODS FOR PRODUCING ELECTRO-OPTIC ACTIVITY IN ORGANIC NONLINEAR OPTICAL MATERIALS FOR ELECTRO-OPTIC DEVICES - Poling structures and methods utilizing an electrostatic field generated from a polar dielectric material, including pyroelectric and ferroelectric materials, to produce electro-optic activity in organic nonlinear optical materials.04-21-2011
20120121217PROBE FOR ELECTRIC/MAGNETIC FIELD - In an electric/magnetic field probe using an optical fiber, when a stress is applied to the fiber, the polarization state of the light propagating in the fiber changes, and the signal level of the electric or magnetic field detection becomes unstable. For coping with this problem, for suppressing the curve or waggle of the optical fiber caused by a stress applied to the fiber, an electric/magnetic field sensor unit composed of the fiber and EO/MO material is fixed on a quartz substrate, for example, and the part of the fiber other than the sensor unit is stored in an acrylic tube and fixed. Further, polarization adjustment parts like a polarization controller, an optical analyzer or the like is installed in the housing, so that a stress caused by wind pressure or contact is not applied to the fiber connected to the parts.05-17-2012
20100290734OPTICAL SENSOR FOR DETECTING AND LOCALIZING EVENTS - A system and method for a structure monitoring and locating a disturbance event is disclosed. The system includes a compact transceiver chip sending optical signals in three optical fibers that encompass the monitored structure appropriately. The system contains a sequence of loops, wherein the first and the second fiber forming the loop clockwise, while the third fiber is winded along the same loop counterclockwise. A set of two detectors registers the returning signals, and a time delay between those signals is calculated, which is indicative of the disturbance event location. The event location is determined with different sensitivity in different parts of the monitored structure depending on the density of fibers in these parts.11-18-2010
20100092127OPTICAL FIBER DISTRIBUTION TYPE SENSOR AND OPTICAL FIBER DISTRIBUTION TYPE DETECTING METHOD - The present invention relates to an optical fiber distribution type detecting method and the like equipped with a structure for enabling efficient measurement of a temperature distribution or strain distribution. This method regulates a modulation frequency and modulation index for probe light and pumping light opposingly incident on an object from a light source and a phase difference between the probe light and pumping light, thereby successively setting the length and location of search domains in a region to be measured. In particular, a detection process is executed while resetting the search domain length shorter at a predetermined interval of time or when an abnormality is detected. Thus partly changing the distance resolution for a specific region in the course of the detection process enables efficient measurement operations in a short time.04-15-2010
20100092126BIFILAR OPTICAL FIBER STOWAGE FOR FIBER-OPTIC GYROSCOPE - A method of constructing a fiber-optic gyroscope includes optically coupling first and second optical fibers to an optical path of an interferometer having an outer surface, coupling at least a portion of the first and second fibers to the outer surface, and optically coupling the first and second fibers to an optical path of an integrated optics chip (IOC).04-15-2010
20100247026PACKAGED SENSORS AND HARSH ENVIRONMENT SYSTEMS WITH PACKAGED SENSORS - A fiber sensor package is disclosed. The fiber sensor package includes an interconnection between a first optical fiber and a second optical fiber within a tubing such that the first and second optical fibers are at least partially disposed within that tubing. A bonding material is disposed across an edge of the interconnection around at least a part of the circumferential surfaces of the first and second fibers, holds rigid the interconnection of the first and second optical fibers. The methods of preparing the package, and the examples of systems benefiting from the fiber sensor package of this invention are also described.09-30-2010
20100247027OPTICAL SENSORS, SYSTEMS, AND METHODS OF MAKING - An optical fiber sensing cable is disclosed. The optical fiber sensing cable comprises a fiber with a core having an index of refraction n09-30-2010
20100080501TEMPERATURE SENSING - A temperature sensor array comprises an optical fibre (04-01-2010
20120134621SENSOR, A SYSTEM AND A METHOD FOR MEASURING FORCES AND/OR MOMENTS - A sensor for measuring forces and/or moments on an object, including at least one sensor element for the detection of an expansion of the object in at least one spatial direction, from which expansion a force or a moment can be determined, wherein the sensor element including an optical fiber with a sensor region with a fiber Bragg grating is provided, and the fiber Bragg grating is adapted to be irradiated with light, preferably a broadband light, generating a reflected light having a peak wavelength. The optical fiber is formed by a fiber core and at least one sheath of light-guiding material surrounding the fiber core. The fiber Bragg grating is arranged in the fiber core. The material of the sheath is doped with a fluorescent material and the fluorescent material may be irradiated with an excitation radiation to generate a fluorescent radiation having at least one main emission wavelength.05-31-2012
20120076452SENSING DEVICE HAVING A LARGE DIAMETER D-SHAPED OPTICAL WAVEGUIDE - An optical sensor formed from an optical waveguide having at least one core surrounded by a cladding and a large diameter generally D-shaped portion is disclosed. Axial or compressive strain across the D-shaped cross section may be determined by measuring the change in polarization or birefringence of the light output from the sensor. A layer responsive to a parameter may be disposed on a flat portion of the D-shaped portion of the sensor. The refractive index of the layer changes and/or the layer applies a strain on the sensor in response to the parameter. Changes in the refractive index of the layer alters the light output from the sensor, which is measured over time and correlated to the parameter.03-29-2012
20080205815MICRO FIBER OPTICAL SENSOR - A method is provided for producing an optical acoustic sensor. In one embodiment, a method comprises winding a single-mode optical sensor fiber around at least one mandrel. The optical acoustic sensor fiber can comprise a core region having a diameter of about 2 μm to about 8 μm and a cladding region having an outer diameter of about 8 μm to about 20 μm. The method can also comprise interconnecting the at least one mandrel into an optical acoustic sensor.08-28-2008
20120230629Fibre Optic Distributed Sensing - A method of distributed fibre optic sensing is described in which an optical fibre (09-13-2012
20120230628 Distributed Fibre Optic Sensing - The invention relates to a distributed fibre optic sensor (09-13-2012
20120224801FIBER OPTIC SEALING APPARATUS - An optical fiber seal includes: an annular layer bonded to an outer glass layer of a length of an optical fiber; and a glass sealing layer bonded to an outer surface of the annular layer and configured to withstand conditions in a downhole environment, the glass sealing layer configured to hermetically seal the length of the optical fiber.09-06-2012
20080298740Integrated Optical Waveguide Sensors With Reduced Signal Modulation - The invention provides an integrated optical waveguide sensor module (12-04-2008
20080298741Electric Device and Method of Its Fabrication - An electronic device and method are presented for creating at least one predetermined stimulus at the device output. The device comprises an electrically non-conductive holey structure (12-04-2008
20120328233Fabrication Tolerant Design for the Chip-Integrated Spectroscopic Identification of Solids, Liquids, and Gases - Methods and systems for a label-free on-chip optical absorption spectrometer consisting of a photonic crystal slot waveguide are disclosed. The invention comprises an on-chip integrated optical absorption spectroscopy device that combines the slow light effect in photonic crystal waveguide and optical field enhancement in a slot waveguide and enables detection and identification of multiple analytes to be performed simultaneously using optical absorption techniques leading to a device for chemical and biological sensing, trace detection, and identification via unique analyte absorption spectral signatures. Other embodiments are described and claimed.12-27-2012
20120328232BEARING MONITORING USING A FIBER BRAGG GRATING - A bearing comprises a Bragg grated optical fiber to measure one or more parameters of the bearing. The optical fiber is coupled to the bearing in such a way that at least a part of the optical fiber that comprises Bragg grating is curved. The grating which is curved is adapted to the curvature in such a way that the frequency response is well defined and not spread out. This is achieved by arranging the gratings such that even though the fiber is curved the gratings appear to be substantially parallel instead of being influenced by the curvature.12-27-2012
20120321242SENSOR ELEMENT AND METHOD FOR THE PRODUCTION THEREOF AND USE THEREOF - A sensor element for detecting mechanical state variables contains at least one optical waveguide having at least one fiber Bragg grating, and at least one planar optical filter element to which light exiting the optical waveguide can be fed to at least one measuring device for determining an intensity ratio of a Stokes and an anti-Stokes lines and/or a propagation time of an optical signal. A method for detecting mechanical state variables uses such a sensor element running along a measuring section, wherein light having at least one predefinable mean wavelength and a predefinable spectral width is coupled into the optical waveguide and light reflected and/or scattered in the optical waveguide is fed to at least two measuring devices, measuring the intensity of the light exiting the optical waveguide in selected spectral ranges, and measuring an intensity ratio of a Stokes and an Anti-stokes line and/or a propagation time of an optical signal.12-20-2012
20110158580SIGNAL IDENTIFYING APPARATUS FOR AN OPTICAL FIBER - Provided is a signal identifying apparatus for an optical fiber that includes a detecting portion capable of detecting a signal originating from a first end of the optical fiber and a signal originating from a second end of the optical fiber. Additionally, the signal identifying apparatus includes an identifying portion that identifies a desired signal by separating the signal originating from the first end of the optical fiber from the signal originating from the second end of the optical fiber.06-30-2011
20120087618Microfluidic waveguide detector - A microfluidic detection device is provided that includes a planar waveguide, or an ion-exchange planar waveguide, a microfluidic channel disposed on the planar waveguide, a light source, such as a laser, LED or incandescent light, directed through the planar waveguide, a labeled cell disposed in the microfluidic channel, where the labeled cell lies in an evanescent field extending from the planar waveguide, and a light detector disposed to receive light from the light source through the planar waveguide. The evanescent field interacts with the labeled cell, where the light through the planar waveguide is altered according to a presence of the labeled cell in the microfluidic channel.04-12-2012
20120288227OPTIC FIBER WITH CARBON NANO-STRUCTURE LAYER, FIBER OPTIC CHEMICAL SENSOR AND METHOD FOR FORMING CARBON NANO-STRUCTURE LAYER IN FIBER CORE - The invention relates to an optic fiber having a core in which carbon nano-structures are formed at a predetermined locus, a fiber optic chemical sensor using the optic fiber, and a method of forming the carbon nano-structure layer in the core of the optic fiber. The invention utilizes gas refractive index and the adsorption sensitivity of particles on the surface of the carbon nano-structure layer, and uses the carbon nano-structure layer in the core of the optic fiber as a sensor for particles of gas, liquid and the like.11-15-2012
20100202726SIDE ILLUMINATED MULTI POINT MULTI PARAMETER OPTICAL FIBER SENSOR - A side illuminated multi point multi parameter optical fiber sensor that requires no sensitive coating is provided. This sensor comprises an optical fiber having at least one removed cladding section as the sensitive region, at least one probing light source that side illuminates the fiber, a power supply, a detector, a signal processor and a display. The sensitive optical fiber is optically affected by the presence of a measurand medium that can fluoresce, phosphoresce, absorb and/or scatter the probing light. This probing light is guided by the fiber core towards a detector which measures the light intensity and this light intensity is correlated with a measurand.08-12-2010
20130016940FIBER OPTIC SENSOR USING TRANSMISSIVE GRATING PANEL AND MIRRORAANM KIM; Chun-GonAACI Yusong-guAACO KRAAGP KIM; Chun-Gon Yusong-gu KRAANM LEE; Yeon-GwanAACI Yusong-guAACO KRAAGP LEE; Yeon-Gwan Yusong-gu KRAANM JANG; Byeong-WookAACI Yusong-guAACO KRAAGP JANG; Byeong-Wook Yusong-gu KRAANM KIM; Jin-HyukAACI Yusong-guAACO KRAAGP KIM; Jin-Hyuk Yusong-gu KRAANM KIM; Yoon-YoungAACI Yusong-guAACO KRAAGP KIM; Yoon-Young Yusong-gu KR - Disclosed herein is a fiber optic sensor using a transmissive grating panel and a mirror, in which displacement resulting from a temperature change in the external environment or a behavioral change in an object to be measured is measured using a transmissive grating panel, a reflection mirror and an optical fiber, and then enables various measurements to be taken of the temperature change in the external environment and the behavioral change (displacement, pressure, vibration or acceleration, etc.) in the object on the basis of the measured displacement.01-17-2013
20130022307OPTICAL SYSTEM HAVING A PHOTONIC CRYSTAL STRUCTURE AND METHOD OF FABRICATION - An optical structure includes an optical waveguide and at least one photonic crystal structure. The optical structure also includes a structural portion mechanically coupled to the optical waveguide and the at least one photonic crystal structure such that a region substantially bounded by the structural portion, the optical waveguide, and the at least one photonic crystal structure has a specified volume.01-24-2013
20080253712Optical fiber substrate useful as a sensor or illumination device component - This disclosure generally pertains to a method for manufacturing a distributed optical fiber scrim comprising a functional optical fiber, the functional optical fiber scrim thus manufactured, and composites in which an optical fiber scrim is incorporated. The present disclosure describes a variety of textile scrims, particularly adhesively bonded nonwoven scrim materials, each comprising at least one optical fiber with a continuous path across at least the length or width of the fabric. Such optical fiber scrims may be useful as sensor components (for example, as a detector of breakage, strain, pressure, or torque), as illumination components (for example, in a variety of light-providing applications), or as data-distribution components, either alone or in combination with other materials, such as fabrics, films, foams, and the like.10-16-2008
20080226217PHOTONIC CRYSTAL STRUCTURE SENSOR - An acoustic sensor and a method of fabricating an acoustic sensor are provided. The acoustic sensor includes at least one photonic crystal structure and an optical fiber having an end optically coupled to the at least one photonic crystal structure. The acoustic sensor further includes a structural portion mechanically coupled to the at least one photonic crystal structure and to the optical fiber. The at least one photonic crystal structure, the optical fiber, and the structural portion substantially bound a region having a volume such that a frequency response of the acoustic sensor is generally flat in a range of acoustic frequencies.09-18-2008
20130170786REMOTE WATER SENSING SYSTEM WITH OPTICAL FIBER - A remote water sensing system and method with optical fiber, comprises a water sensor which is an optical element designed in accordance with the principle of optical path return loss and provided with reusable features to measure the state of having water or not. A monitoring equipment is provided which is an Optical Time Domain Reflectometer (OTDR), an Optical Frequency Modulated Continuous Wave (OFMCW), or a light source power meter, and used to emit monitoring light signals and accept optical signals returned from the water sensor. A signal processing control unit analyzes the optical signal returned from the water sensor to determine whether the monitoring position is touching the water or not. The method can be used in other fields, such as optical closure watering monitoring, telecommunications facilities flooding alarm, and monitoring and alarm for a low-lying area or river water level of a bridge.07-04-2013
20110274386Fiber-Optic Vibration Sensor - A fiber-optic vibration sensor for generators in power stations is disclosed. The sensor includes an optical fiber which has a freestanding end, wherein the freestanding end is caused to oscillate under the influence of vibrations, and the resulting oscillations are detected as a measure for the vibrations. Only the net weight of the optical fiber serves as a centrifugal mass.11-10-2011
20080219616All Polymer Optical Waveguide Sensor - The present invention is directed to an evanescent field induced optical sensor of a transparent polymer substrate coated with a thin transparent polymer waveguide for use as biosensor for detecting biological molecules, wherein the transparent polymer waveguide has a thickness of ≧0.10 μm and ≦0.50 μm and a refractive index n09-11-2008
20080219615Photonic crystal sensors with intergrated fluid containment structure - Photonic crystal (PC) sensors, and sensor arrays and sensing systems incorporating PC sensors are described which have integrated fluid containment and/or fluid handling structures. Sensors and sensing systems of the present disclosure are capable of high throughput sensing of analytes in fluid samples, bulk refractive index detection, and label-free detection of a range of molecules, including biomolecules and therapeutic candidates. The present disclosure also provides a commercially attractive fabrication platform for making photonic crystal sensors and systems wherein an integrated fluid containment structure and a photonic crystal structure are fabricated in a single molding or imprinting processing step amendable to high throughput processing.09-11-2008
20130114923SLOTTED OPTICAL FIBERS AND METHODS AND APPARATUSES FOR THE SAME - The present application relates to optical fibers having at least one slot. The optical fiber may be used, for example, in various sensing application. In some embodiments, a cross-section of the optical fiber perpendicular to the longitudinal axis has a largest dimension less than or equal to about 4 μm, and the slot has a width of about 5 nm to about 500 nm and a depth of at least about 10 nm. Also disclosed herein are methods of using the optical fibers and apparatuses including the optical fibers.05-09-2013
20110268384OPTICAL-FIBER-COMPATIBLE ACOUSTIC SENSOR - An acoustic sensor includes a diaphragm having a reflective element. The sensor has an optical fiber positioned relative to the reflective element such that light emitted from the optical fiber is reflected by the reflective element. A first end of the optical fiber and the reflective element form an optical cavity therebetween. The acoustic sensor further includes a structural element mechanically coupled to the diaphragm and the optical fiber. The structural element includes a material having a coefficient of thermal expansion substantially similar to the coefficient of thermal expansion of the optical fiber. For example, the material can be silica.11-03-2011
20130142477INTEGRATED OPTICAL WAVEGUIDE EVANSCENT FIELD SENSOR - Integrated optical waveguide evanescent field sensor for sensing of chemical and/or physical quantities, comprising a substrate carrying a waveguide layer structure provided with—a waveguide core layer (06-06-2013
20080199127SHARED LIGHT PIPE FOR MESSAGE INDICATOR AND LIGHT SENSOR - A shared light pipe is set forth for transmitting light generated by a message waiting LED in a mobile communication device, in one direction, and transmitting ambient or surrounding light, in an opposite direction, to a light sensor for controlling a display backlight of the device. The light pipe includes an elongated first portion having a first end for receiving and transmitting light and external surfaces for reflecting light there through via total internal reflection (TIR), a second portion coextensive with the first portion for outputting light received at the first end and reflected through the first portion, and a second branch coextensive with the first portion for receiving and transmitting light for output at the first end.08-21-2008
20090087135Impact-Sensing Thermal Insulation System and Missile Incorporating Same - An impact-sensing, thermal insulation system includes a light source; an optical detector; and an optically-transmissive insulation optically coupled with the light source and the optical detector, the optically-transmissive insulation being operably associated with an outer surface of a pressure vessel. A missile includes a body; a propulsion system including a pressure vessel having an outer surface; and an impact-sensing, thermal insulation system operably associated with the outer surface of the pressure vessel. The impact-sensing, thermal insulation system includes a light source; an optical detector; and an optically-transmissive insulation optically coupled with the light source and the optical detector, the optically-transmissive insulation being operably associated with the outer surface of the pressure vessel.04-02-2009
20100316328Fiber optic position transducer with magnetostrictive material and position calibration process - Fiber optic position transducer that includes a magnetic or electromagnetic element, one or more segments of magnetostrictive material, Fiber Bragg Grating Sensors, a rod of material that is impenetrable to magnetic fields, optical fiber. One or more of the sensors is fixed upon a segment of magnetostrictive material, which is fixed to a rod, and may only be displaced longitudinally. The Fiber Bragg Grating Sensors have different wave lengths and are made of the same optical fiber. The magnetic or electromagnetic element included may be made of NdFeB (Neodymium Iron Boron) or metal alloys of TbDyFe (Terbium, Dysprosium and Iron), such as TX, Terphenol-D and others. It is applied to a control flow valve in an oil well, and it also refers to the calibration process of the position of the transducer.12-16-2010
20130156363Integrated Optical Waveguide Evanescent Field Sensor and Longitudinal Section of a Substrate for Use in Such a Sensor - The invention relates to an integrated optical waveguide evanescent field sensor (06-20-2013
20120281944FIBER-OPTIC SENSOR FOR LIQUID-IMMERSION DETECTION AND FIBER-OPTIC DETECTION SYSTEM FOR LIQUID-IMMERSION DETECTION - A fiber-optic sensor for liquid-immersion detection includes an optical fiber and an interface material layer. The optical fiber has an angled physical contact (APC) surface. The interface material layer contacts with the APC surface. The interface material layer has a rough surface when in a dry state to produce a diffusion reflection. The interface material layer has a smooth surface to produce a specular reflection when the interface material layer absorbs a liquid in a wet state.11-08-2012
20120281946MODALMETRIC FIBRE SENSOR - A modalmetric fibre sensor comprises a multimode sensor fibre (11-08-2012
20120281945SMALL DIAMETER RADIATION SENSOR CABLE - A duplex plastic optical fiber may be used to create a dual detector system, which allows for the detection of two distinct areas of radiation in a single sensor cable device. A fiber cap holds a scintillating fiber and slides over an exposed portion of an optical fiber adjacent to an end of the optical fiber to create a concentric connection for a radiation sensor cable used in medical radiation therapy.11-08-2012
20120027338OPTICAL SENSOR MODULE - An optical sensor module is provided which reduces variations in optical coupling loss between a core in an optical waveguide unit and an optical element in a substrate unit and which reduces the optical coupling loss. The optical waveguide unit including vertical groove portions for fitting engagement with the substrate unit and the substrate unit including fitting plate portions for fitting engagement with the vertical groove portions are produced individually. The fitting plate portions in the substrate unit are brought into fitting engagement with the vertical groove portions in the optical waveguide unit, so that the substrate unit and the optical waveguide unit are integrated together. The vertical groove portions in the optical waveguide unit are in an appropriate position relative to a light-transmissive surface of the core. The fitting plate portions in the substrate unit are in an appropriate position relative to the optical element.02-02-2012
20090041405Ridge waveguide optical sensor incorporating a Bragg grating - An optical sensor for sensing information relating to an analyte liquid or gas, has a a planar substrate having a refractive index n02-12-2009
20130209024STRAIN SENSOR, MANUFACTURING METHOD AND SYSTEM - Strain sensor, including an elongated protective encasing (08-15-2013

Patent applications in class OPTICAL WAVEGUIDE SENSOR

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