| Patent application number | Description | Published |
|---|
| 20090028001 | REFLECTIVE AND SLANTED ARRAY CHANNELIZED SENSOR ARRAYS - Reflective and slanted array channelized sensor arrays having a broadband source providing acoustic energy to a reflective or slanted array that reflects a portion of the incident signal to one or more sensing films wherein the response is measured. | 01-29-2009 |
| 20090085430 | COMPENSATION OF RESONATORS FOR SUBSTRATE AND TRANSDUCER ASSYMETRY - An in-line SAW resonator employs an asymmetric adjustment of the Bragg frequencies of the left outer reflector and right outer reflector where the degree of periodicity shift and the relative direction of the frequency shift are calculated to move the peaks of the acoustic standing wave trapped between the gratings to coincide with the optimized centers of transduction of one or more interdigital transducers (IDTs) without the need for undesirable breaks in the periodicity or the use of reflectionless IDTs. | 04-02-2009 |
| 20090206844 | ACOUSTIC WAVE DEVICE PHYSICAL PARAMETER SENSOR - An acoustic wave sensor employs an electromagnetic device (EMD) to transduce and amplify the response of an impedance element to a physical measurand. One embodiment uses a magnetic field sensor employing a microelectromechanical system (MEMS) capacitor to affect a change in the response of a SAW filter. | 08-20-2009 |
| 20090216467 | Sensor, system, and method, for measuring fluid properties using Multi-Mode Quasi-Shear-Horizontal Resonator - A system and a method for providing information on two of the three variables, density (ρ), viscosity (η), and elastic modulus (c) of a fluid, such that independent knowledge of one variable allows the remaining two variables to be measured by a single sensor. The present invention relies on the interaction of a predominantly shear horizontal acoustic wave device (“quasi-shear-horizontal”) with the fluid, so as to measure subtle differences in the interaction of two or more acoustic resonance states or waveguide modes of a multi-mode resonator or waveguide, and to derive the desired fluid characteristics therefrom. The most preferred embodiment is a dual-mode coupled resonator filter geometry with one resonant mode having a high degree of symmetry and the other having a high degree of anti-symmetry. By combining the additional information of multi-moded operation with the inherent ability of a horizontally-polarized quasi-shear-horizontal acoustic wave device (AWD) to operate in fluid environments, one obtains a multi-mode quasi-shear-horizontal (MMQSH) resonator. | 08-27-2009 |
| 20090309453 | ELECTRO ACOUSTIC SENSOR FOR HIGH PRESSURE ENVIRONMENTS - A composite acoustic wave device (AWD) which is adapted for operation at high ambient pressures is provided. The AWD comprises two piezoelectric plates in back to back relationship, with electrodes disposed between the plates. The plates are bonded so as to neutralize the effects of external pressure. Further disclosed is a sensor utilizing the AWD and methods for utilizing such AWD for physical measurements in high pressure environments. An optional cavity formed between the piezoelectric plates offers the capability to measure the pressure and to further neutralize the residual effects of the pressure on measurement accuracy. | 12-17-2009 |
| 20100038997 | COATING FOR HARSH ENVIRONMENTS AND SENSORS USING SAME - A coating providing high abrasion and chemical resistance composed of a barrier layer from vanadium, molybdenum, niobium, tantalum and the like, and an outer layer of diamond-like carbon. The coating is especially applicable for acoustic wave device (AWD) based sensors, and for passivating an electrode such as an electrode deposited on the AWD sensing area. The coating provides excellent mechanical and acoustical characteristics for coating acoustic wave devices allowing the sensor to operate in harsh environments. | 02-18-2010 |
| 20100043560 | REFLECTIVE AND SLANTED ARRAY CHANNELIZED SENSOR ARRAYS - Reflective and slanted array channelized sensor arrays having a broadband source providing acoustic energy to a reflective or slanted array that reflects a portion of the incident signal to one or more sensing films wherein the response is measured. | 02-25-2010 |
| 20100052470 | Asymmetric Composite Acoustic Wave Sensor - A composite acoustic wave device provides improved protection from environmental factors while maintaining high electrical characteristics and dynamic range is provided. The device comprises a rigid protector plate having high quality acoustical characteristics and a thickness which is a multiple of half wavelength of the resonant frequency. A piezoelectric plate is coupled to the protector plate, is supported therefrom, and forms an energy interface therewith. The piezoelectric and protector plates are dimensioned such that a wave of resonant frequency traveling between the excitation face and the loaded/sensing face, forms a substantially continuous-phase wave, at substantially peak amplitude, at the energy interface. By doing so the device decouples the electrical thickness of the wave device from the mechanical thickness thereof. | 03-04-2010 |
| 20100231092 | Lateral Excitation of Pure Shear Modes - Circularly polarized resonant structures are obtained utilizing piezoelectric resonators made of materials and orientations selected in accordance with the teaching provided herewith. Further provided are radially polarized structures. Furthermore, the utilization of such resonators and structures as sensors, for frequency control application, for signal filtering, and the like, is also disclosed. | 09-16-2010 |
| 20100271152 | INTEGRATED COUPLING STRUCTURES - An integrated package provides contactless communication through a coupling mechanism embedded in the package. Package types include Surface Mount Technology (SMT), Low Temperature Co-fired Ceramic (LTCC) technology, and dual-in-line integrated circuit pressed ceramic packages generally. The package can include an acoustic wave device (AWD) sensor such as a surface acoustic wave (SAW) device or a bulk acoustic wave (BAW) device. Coupling includes inductive and capacitive effects through plates, loops, spirals, and coils. Coil inductance and SAW capacitance can be parallel resonant at the desired SAW resonance with the coil impedance higher than the SAW impedance, minimizing load-pull effects. | 10-28-2010 |
| 20100304012 | Electrode passivation - A coating providing high abrasion and chemical resistance composed of a barrier layer from vanadium, molybdenum, niobium, tantalum and the like, and an outer layer of diamond-like carbon. The coating is especially applicable for acoustic wave device (AWD) based sensors, and for passivating an electrode such as an electrode deposited on the AWD sensing area. The coating provides excellent mechanical and acoustical characteristics for coating acoustic wave devices allowing the sensor to operate in harsh environments. | 12-02-2010 |
| 20110071776 | CONTROLLED COMPRESSIONAL WAVE COMPONENTS OF THICKNESS SHEAR MODE MULTI-MEASURAND SENSORS - The current invention relates to a conductivity-dielectric (CD) electrode design with apertures that allow compressional waves to propagate away from the surface of the acoustic wave device unimpeded. This prevents reflection of compressional waves that would interact with the viscosity sensor surface, thus altering the device response. It allows compressional waves to pass through, and allows the dual mode viscosity sensor responses to be utilized for density/viscosity/elasticity measurement and correlation. The invention further offers methods of instrumentation to detect unwanted reflections, to compensate, and to correct for the distortions caused by reflections. Finally, the invention provides a system and method for utilizing deliberately introduced reflections to obtain additional information, including fluid density. | 03-24-2011 |
