Inventors list

Assignees list

Classification tree browser

Top 100 Inventors

Top 100 Assignees


IMPEDANCE, ADMITTANCE OR OTHER QUANTITIES REPRESENTATIVE OF ELECTRICAL STIMULUS/RESPONSE RELATIONSHIPS

Subclass of:

324 - Electricity: measuring and testing

Patent class list (only not empty are listed)

Deeper subclasses:

Class / Patent application numberDescriptionNumber of patent applications / Date published
324649000 Lumped type parameters 1583
324629000 Distributive type parameters 223
324612000 Parameter related to the reproduction or fidelity of a signal affected by a circuit under test 139
324601000 Calibration 108
324602000 With auxiliary means to condition stimulus/response signals 32
324727000 Piezoelectric crystal testing (e.g., frequency, resistance) 4
20100182026METHODS AND SYSTEMS FOR DETERMINING FLEXOELECTRIC EFFECT IN A LIQUID CRYSTAL - There are provided methods for creating energy conversion devices based on the giant flexoelectric effect in non-calamitic liquid crystals. By preparing a substance comprising at least one type of non-calamitic liquid crystal molecules and stabilizing the substance to form a mechanically flexible material, flexible conductive electrodes may be applied to the material to create an electro-mechanical energy conversion device which relies on the giant flexoelectric effect to produce electrical and/or mechanical energy that is usable in such applications as, for example, power sources, energy dissipation, sensors/transducers, and actuators.07-22-2010
20100182025Method and Apparatus for Piezoelectric Sensor Status Assessment - A method for assessing the status of a piezoelectric sensor of interest 07-22-2010
20090174419INSPECTION METHOD, INSPECTION APPARATUS, AND POLARIZATION METHOD FOR PIEZOELECTRIC ELEMENT - A method for inspecting a piezoelectric element includes first-inspection-signal application step of applying to the piezoelectric element a first inspection signal Vp(07-09-2009
20120146671METHOD OF AND APPARATUS FOR DETECTING CRACKS IN PIEZOELECTRIC ELEMENT - A method detects one or more cracks in a piezoelectric element interposed between a pair of electrodes and deforms according to a voltage applied thereto through the pair of electrodes. The method includes steps of applying a voltage at least at a resonance frequency of the piezoelectric element to the piezoelectric element through the pair of electrodes, measuring a dielectric tangent between the pair of electrodes under the applied voltage, and detecting if there are cracks in the piezoelectric element according to the measured dielectric tangent. The dielectric tangent of the piezoelectric element at the resonance frequency has a large peak or no peak depending on whether or not the piezoelectric element has cracks. Accordingly, the method easily and surely detects if the piezoelectric element has cracks according to the dielectric tangent of the piezoelectric element measured at the resonance frequency.06-14-2012
324725000 Using a particular bridge circuit 4
20100109687Impedance Measurement System and Method - The impedance of ionic solutions may be determined using a bridge circuit where the ionic solution comprises a leg of the bridge circuit and a reference impedance characterized by a reference time constant comprises a second leg of the bridge circuit. The bridge is driven by a switched DC voltage waveform. Measurement of the ionic solution is delayed after switching to allow the reference impedance to reach its asymptotic value. The reference impedance may be varied to reduce the reference time constant.05-06-2010
20080265917Return loss bridge circuit - A return loss bridge circuit for testing a balanced test impedance includes an input connector and a reflection connector. The input connector and the reflection connector are electrically connected to an output of a network analyzer and an input of the network analyzer, respectively. The return loss bridge circuit further includes a reference impedance connected between the input and reflection connectors, first and second transformers and a common mode choke. The common mode choke is electrically connectable to the balanced test impedance.10-30-2008
20080231294STRUCTURAL HEALTH MONITORING CIRCUIT - A structural health monitoring circuit apparatus and method are based on electrical impedance variations of a piezoelectric patch, which is attached to a structure to be monitored. The circuit compares a known good sweep of frequency-impedance pairs with a contemporaneous sweep to generate an alarm when an error bound is exceeded. The impedance of the piezoelectric patch is determined though adjustment of a variable reactance in a bridge configuration. By suitable design of the bridge elements, the electrical impedance of the piezoelectric patch may be directly measured. A microprocessor controlled version of this device consumes less than 2 W of power, which may be further reduced by further large scale integration or reduction to a state machine on a programmable gate array. Ultimately, this device may give personnel warnings to aircraft, automobiles, bridges, elevated roads, buildings, or home structural failures.09-25-2008
20080297181Measuring Bridge Arrangement, Method of Testing a Measuring Bridge, Test Arrangement for Testing a Measuring Bridge, Method of Producing a Tested Measuring Bridge Arrangement, and Computer Program - A measuring bridge arrangement has a measuring bridge with a first supply terminal and first and second measuring signal terminals. The measuring bridge arrangement has a working point adjustment circuit formed to feed the measuring bridge via at least the first supply terminal in a measuring state of operation, and to apply a signal to one of the measuring signal terminals in the test state of operation in order to bring the measuring bridge to a test working point different from a measuring working point in the measuring state of operation. The measuring bridge has a test tap, wherein a test signal dependent on resistive properties of at least one element of the measuring bridge can be tapped at the test tap of the measuring bridge.12-04-2008
Entries
DocumentTitleDate
20130043883SIGNAL TEST APPARATUS FOR SAS DEVICES - A signal test apparatus for a serial attached Small Computer System Interface (SAS) device includes an SAS female connector to be connected to the SAS device, an SAS male connector to be connected to a server, first and second pairs of subminiature version A (SMA) connectors, and first and second groups of switches. When the first pair of SMA connectors is connected to an oscillograph to test a pair of output signals from the SAS device, the second group of switches are turned on and the first group of switches are turned off to communicate the SAS device with the server. When the second pair of SMA connector is connected to the oscillograph to test another pair of output signals from the SAS device, the first group of switches are turned on and the second group of switches are turned off to communicate the SAS device with the server.02-21-2013
20090267614Physical Property Measuring Method for TFT Liquid Crystal Panel and Physical Property Measuring Apparatus for TFT Liquid Crystal Panel - There is provided a physical property measuring method for a TFT liquid crystal panel, includes an impedance setting step of setting the impedance between the source and drain of a TFT of the TFT liquid crystal panel to be less than or equal to a predetermined value, a voltage application step of applying a voltage that cyclically varies to a liquid crystal layer of the TFT liquid crystal panel. And the method further includes a physical property measuring step of measuring a transient current flowing through the liquid crystal layer to which the voltage that cyclically varies is applied in the voltage application step to measure physical properties of the liquid crystal layer.10-29-2009
20090284269Apparatus for ascertaining and/or monitoring a process variable - The invention relates to an apparatus for ascertaining and/or monitoring a process variable. The apparatus includes a sensor element (11-19-2009
20090140749Device for Measuring a Load Current - A device for measuring a load current in a load circuit that has a switch that switches the load current. The switch has a control variable as a first switch variable and an output variable, which is dependent on the control variable, as a second switch variable. A setting unit keeps one of the switch variables constant at a predetermined value, and an evaluation unit determines the load current from the other switch variable. It is thus possible to dispense with an additional measuring element for measuring the load current, thus keeping the power loss low.06-04-2009
20110199095Multilevel Connector System - The invention relates to a connector system comprising a first connector having a plurality of first contact terminals (E, F, G, J); a second connector having a plurality of second contact terminals, wherein the second contact terminals (A, B, C, D) and the electrical device are arranged such that, while connecting, the first contact terminals come into contact with a first subset of the plurality of second contact terminals in a first connecting stage and while the connecting further proceeds the first contact terminals come into contact with a second subset of the second contact terminals, such that in the first connecting stage an electrical quantity between two of the first contact terminals is detectable which is different from the electrical quantity in an uncoupled condition of the connectors, and in the second connecting stage a further electrical quantity between at least two of the first contact terminals is detectable which is different from the electrical quantity detected in the first connecting stage.08-18-2011
20080238440MEASURING SYSTEM - A measuring system measuring an impedance of an object to be measured, including an impedance measuring instrument; a casing formed of a grounded conductor and capable of locating the object to be measured therein; and a radially-shaped electrode connected to the impedance measuring instrument and capable of being connected to the object to be measured.10-02-2008
20120105075METHOD FOR CHARACTERIZING AN ELECTRICAL SYSTEM BY IMPEDANCE SPECTROSCOPY - The invention relates to a method for more precisely characterizing an electrical system by impedance spectrometry. Said method consists of: 05-03-2012
20100259281ARCHITECTURE AND METHOD TO DETERMINE LEAKAGE IMPEDANCE AND LEAKAGE VOLTAGE NODE - A circuit, system, machine-readable storage medium and method for detecting the presence of a leakage path in a multi-cell voltage source is described. The system includes a detection circuit, the detection circuit having a first, second and third amplifiers, a first input of the first amplifier connected to a first terminal of the voltage source and the first input of the second amplifier connected to a second terminal of the voltage source, a second input of each of the first and second amplifiers connected to a reference capacitor, and an output of each of the first, second and third amplifiers connected to a respective first, second and third outputs of the detection circuit; and a processor having inputs connected to the first and second outputs of the detection circuit.10-14-2010
20110221450MEASUREMENT PROCESS FOR DETERMINATION OF THE OPTIMUM CONTACT PRESSURE AMONG COMPONENTS OF A SOLID OXIDE FUEL CELL STACK IN THE PACKAGING PROCESS AND ITS MEASUREMENT APPARATUS - The present invention provides a measurement process for determination of the optimum contact pressure among components of a solid oxide fuel cell stack in the packaging process in order that the reduction in performance caused by the packaging process can be reduced. The present invention also provides a measurement apparatus which can carry the measurement process out.09-15-2011
20100001740METHOD AND DEVICE FOR MEASURING IMPEDANCE - The invention relates to a method and system and microchip for determining impedance of a variable impedance component. The method comprises tuning a tunable oscillator over a predefined tuning range, the tunable oscillator having the variable impedance component coupled as a load thereof. The frequency response of the tunable oscillator is measured as a function of said tuning. Finally, the measured frequency response is analyzed for determining the impedance of the variable impedance component. The invention makes possible to manufacture smaller and simpler monolithic sensor microchips.01-07-2010
20110210751Chemical sensor using thin-film sensing member - Provided is a chemical sensor that may include a first electrode on a substrate, a sensing member covering the first electrode on the substrate, and a plurality of second electrodes on a surface of the sensing member exposing the surface of the sensing member. The chemical sensor may be configured to measure the change in electrical characteristics when a compound to be sensed is adsorbed on the sensing member. Provided also is a chemical sensor array including an array of chemical sensors.09-01-2011
20110001487MULTICONTACT TACTILE SENSOR WITH SINGLE-CONTACT IDLE MODE - A multicontact tactile sensor including a matrix formed of two transparent conducting layers, at least one exhibiting an array of fine conducting tracks, a control circuit including a power supply for one of the layers, and a mechanism detecting the other layer, the sensor having an operating mode of multicontact type corresponding to a sweep of supply to the lines of the corresponding layer, and an operating mode of monocontact type corresponding to a continuous and uniform supply over a whole of the sensor, each operating mode being activated as a function of the detection or nondetection of at least one contact.01-06-2011
20110025345ELECTRODE SYSTEM FOR PROXIMITY DETECTION AND HAND-HELD DEVICE WITH ELECTRODE SYSTEM - An electrical hand-held device is provided with improved proximity detection, which can be placed on a surface and has at least one transmission electrode, at least one reception electrode and at least one compensation electrode arranged between transmission electrode and reception electrode. The transmission electrode and the compensation electrode can be supplied with an electric switching signal of predetermined signal frequency and predetermined signal amplitude. Switching electric signal at the compensation electrode is phase-delayed with respect to the switching electric signal at the transmission electrode. Alternating electric fields radiated at the transmission electrode and the compensation electrode generate a current in the reception electrode, which is representative of an approach of a hand to the hand-held device. The transmission electrode and the reception electrode are arranged in such a way, that the impedance between the transmission electrode and the reception electrode exceeds a predetermined value, which is suitable to keep the current generated in the reception electrode under a predetermined value.02-03-2011
20110074439EYEGLASS LENS PROCESSING APPARATUS AND CALIBRATION SENSOR UNIT - An eyeglass lens processing apparatus includes lens chuck shafts, processing tools for processing a lens and processing tool rotating shafts to which the processing tools are attached. A calibration sensor unit for calibrating the eyeglass lens processing apparatus includes: an attachment portion attached to the lens chuck shafts; a contact member contacting the processing tools; a support mechanism configured to movably support the contact member and has an urging member that urges the contact member in a direction separating from the attachment portion; and a sensor that detects the contact of the contact member with the processing tools. The urging member has an urging force by which the processing tool rotating shafts and the lens chuck shafts are not bent to a predetermined tolerance or more when the contact member contacts the processing tools and is moved toward the attachment portion.03-31-2011
20120200302Electrical Impedance Imaging - An apparatus for electrical impedance imaging has electrodes arranged on an electrode carrier in an arrangement including a unit of repetition. The unit of repetition repeats over the electrode carrier and has an angle of rotational symmetry less than 90°. Specifically, the unit of repetition is an equilateral triangle or a hexagon.08-09-2012
20100026315SIGNAL MEASUREMENT SYSTEMS AND METHODS - Signal measuring systems, and measurement methods are disclosed.02-04-2010
20090174414Testing system for electricity safety and a testing method therefor - A system for testing the safety of electricity includes steps as following. First step is inserting a testing apparatus into a socket of utility power. Second step is providing a first amplifier and rectifier unit for measuring a first voltage wave as no-loading. Third step is providing a signal capturing unit at driver circuit for capturing an instant load cycle current wave. Fourth step is providing a second amplifier and rectifier unit for simulating a second voltage wave according to the instant cycle current wave. At least, a processing unit provides for comparing the first voltage wave with the second voltage wave. Therefore, the above-mentioned method is provided for determining the quality of household electricity wire and further improving the electricity safety.07-09-2009
20110050246Method for Screening Olfactory Sensibility Inhibitor - To provide a method for objectively evaluating or screening to identify a substance which is capable of suppressing or regulating olfaction. A method of evaluating or screening to identify an agent for suppressing olfactory sensitivity, including adding a test substance to a substrate having a voltage-dependent cation channel and evaluating or selecting a substance that inhibits an electrical activity caused by the cation channel. A method of evaluating or screening to identify an agent for suppressing olfactory sensitivity, including the following steps (1) to (4): (1) adding a test substance to a substrate having a voltage-dependent cation channel; (2) measuring electrical activity caused by the voltage-dependent cation channel; (3) comparing the electrical activity measured in step (2) with the corresponding electrical activity in a control group; and (4) evaluating or selecting the test substance that inhibits the electrical activity as an agent for suppressing olfactory sensitivity, based on the results obtained in step (3).03-03-2011
20120043969Impedance Tomography Apparatus - An impedance tomography apparatus is disclosed for the measuring of the electrical activity of excitable tissue. The apparatus comprises a plurality of signal transfer devices adapted for transferring an input signal to a body and receiving an output signal from a body. An input signal generator is adapted to generate an electrical input signal and apply it to at least one of the signal transfer devices. A measurement device is arranged to measure the output signal from the body at least one or more of the remaining signal transfer devices, wherein the input signal generator is adapted to generate an input signal of frequency greater than 100 Hz and less that 5 kHz. This allows the depolarisation of nervous or muscle tissue to be imaged.02-23-2012
20120013349METHOD OF MEASURING CHARACTERISTICS OF A SEMICONDUCTOR ELEMENT AND METHOD OF MANUFACTURING A SEMICONDUCTOR DEVICE - A measurement terminal is arranged at an edge of a semiconductor wafer to be apart from a gate electrode and a source electrode formed in a surface portion on one side in a thickness direction of a semiconductor wafer so that an electrode contact portion is in contact with a drain electrode on the other side in the thickness direction of the semiconductor wafer and that a terminal contact portion is exposed to the one side in the thickness direction of the semiconductor wafer. A probe terminal is brought into contact with the terminal contact portion of the measurement terminal and the probe terminal is brought into contact with the gate electrode and the source electrode, to thereby measure electrical characteristics of a MOSFET.01-19-2012
20120062240CURRENT DETECTION CIRCUIT - An object is to widen detection range of current. A current detection circuit includes a first resistor, which is connected to a first connection terminal and a second connection terminal; a second resistor, which is connected to the first resistor; a third resistor, which is connected to the first resistor; a first transistor, a source of which is connected to the second resistor; a second transistor, a source of which is connected to the third resistor, and a drain and a gate of which is connected to a gate of the first transistor; a third transistor, a source of which is connected to the source of the second transistor, and a gate of which is connected to the drain of the first transistor; and a fourth resistor, which is connected to the drain of the third transistor, and to which a voltage is input.03-15-2012
20120161783DRY GEL-CONDUCTIVE SCAFFOLD SENSOR - A dry gel-conductive sensor. In embodiments, the sensor comprises a scaffold structure which comprises a structure and a covering. A conductive material, which is both ionically and electronically conductive, may be dispersed within the structure. According to an embodiment, the covering comprises openings which allow conductive material through the covering to contact the skin of a subject. The covering may additionally or alternatively comprise brush-like features configured to penetrate through hair.06-28-2012
20120161782SYSTEM AND METHOD FOR ARTIFACT SUPPRESSION IN SOFT-FIELD TOMOGRAPHY - A system and method for artifact suppression in soft-field tomography are provided. One method includes obtaining an excitation pattern and applying the excitation pattern to an object, wherein the excitation pattern includes a plurality of frequency components. The method also includes measuring a response at one or more of a plurality of transducers coupled to the object and separating the responses among the plurality of frequency components to suppress one or more artifacts.06-28-2012
20100001741Method for Locating Pipe Leaks - A method for identifying leaks in pipes employs an electrical conductor extending longitudinally along a pipe between first and second measuring points. A measurement signal in the form of a temporally variable voltage is applied to the electrical conductor, and the impedance behavior of the conductor is used to determine the presence of a leak. A first measurement signal in the form of a temporally variable voltage is transmitted from the first measuring point to the second measuring point via the electrical conductor, and both measuring points evaluate the impedance of the electrical line. The second measuring point transmits a first result signal with the results of the impedance evaluation to the first measuring point via the same electrical conductor such that the first result signal temporally overlaps the first measurement signal, and the first measurement signal and the first result signal are present in non-overlapping frequency bands.01-07-2010
20080297169Particle Fraction Determination of A Sample - The present invention provides a device, test cards, methods and kits which are useful for determining the particle fraction and rate of viscosity of a fluid sample, the presence of an analyte in a fluid sample, or the aggregation of particles in a fluid sample to detect an analyte or as an immunologic assay.12-04-2008
20100148798Apparatus and Method for Electrical Impedance Imaging - An apparatus 06-17-2010
20130113499METHOD AND APPARATUS FOR DETERMINING PLANAR IMPEDANCE TOMOGRAPHY - A method and apparatus for determining planar impedance tomography of a sample comprising a measurement head unit comprising an impedance sensor; a three-axis actuator assembly, coupled to the measurement head unit, for positioning the impedance sensor relative to a sample; a controller, coupled to the three-axis actuator assembly, for controlling the three-axis actuator assembly to position the impedance sensor at a plurality of locations relative to the sample; and an impedance analyzer, coupled to the impedance sensor, for determining an impedance value at each location in the plurality of locations.05-09-2013
20120274336ARCHITECTURE AND METHOD TO DETERMINE LEAKAGE IMPEDANCE AND LEAKAGE VOLTAGE NODE - A circuit, system, machine-readable storage medium and method for detecting the presence of a leakage path in a multi-cell voltage source is described. The system includes a detection circuit, the detection circuit having a first, second and third amplifiers, a first input of the first amplifier connected to a first terminal of the voltage source and the first input of the second amplifier connected to a second terminal of the voltage source, a second input of each of the first and second amplifiers connected to a reference capacitor, and an output of each of the first, second and third amplifiers connected to a respective first, second and third outputs of the detection circuit; and a processor having inputs connected to the first and second outputs of the detection circuit.11-01-2012
20100315097AMPLIFIER CIRCUIT - An amplifier circuit comprises an amplifier for amplifying an input signal and outputting the amplified signal to an external device. A power supply provides a supply voltage to the amplifier. The nature or type of external device (for example line-load or headphones) is determined by measuring a parameter related to the supply voltage. The parameter may be the time taken for the supply voltage to fall or rise a predefined threshold value. Alternatively, the measured parameter may be a voltage drop or voltage rise over a predetermined period of time. Both of these parameters give an indication as to the rate of change of the supply voltage with time, which provides an indication of the nature of the load. Processing circuitry may be provided for calibrating the rate of change of the supply voltage with time, based on the input signal.12-16-2010
20110309844SYSTEM FOR MEASUREMENT WITH PEARLS - A system is provided for measurement with one or more sensors including at least one signal conductor and at least one pearl, wherein the pearl a device configured to change an impedance mismatch with an external environmental effect.12-22-2011

Patent applications in class IMPEDANCE, ADMITTANCE OR OTHER QUANTITIES REPRESENTATIVE OF ELECTRICAL STIMULUS/RESPONSE RELATIONSHIPS

Patent applications in all subclasses IMPEDANCE, ADMITTANCE OR OTHER QUANTITIES REPRESENTATIVE OF ELECTRICAL STIMULUS/RESPONSE RELATIONSHIPS