Class / Patent application number | Description | Number of patent applications / Date published |
324652000 | Of a resonant circuit | 19 |
20080265912 | Portable line impedance measurement method and system - A technique is disclosed for determining capacitive, inductive, and resistive components of power line impedance via a portable line impedance measurement system. The measurement system includes a circuit that switches a burden resistor between power line conductors to cause a droop in a voltage waveform. The voltage waveform is sampled prior to inclusion of the resistor in the circuit, as well as after to identify the droop. The short circuit between the power lines is then removed by opening the circuit and a first effective capacitance in the test circuitry causes a resonant ring due to the inductive component of the power line impedance. The process is repeated a second time with a second effective load capacitance enabled in the test circuitry to cause a second resonant ring. Based upon the frequency of the rings and the voltage measurements, the individual impedance components of power line impedance can be computed. | 10-30-2008 |
20090045820 | TACTILE SENSOR UTILIZING MICROCOILS WITH SPIRAL SHAPE - Provided is a material for tactile sensor, which is easy to be formed, and in which the shape, size and orientation of coils dispersed in the medium are sufficiently controlled. The tactile-sensitive material comprises a medium and a plurality of micro coils dispersed in the medium and constituting a LCR resonance circuit, and wherein each of the plurality of micro coils comprises at least one spiral coil portion, and coil axes of the plurality of micro coils are aligned along at least one direction and/or directed in at least one plane. When a tactile stress is applied to the tactile-sensitive material, the C component is varied significantly, which contributes to the improvement in sensitivity of the tactile sensor. Further, by providing a core at the coil center, the sensitivity is more improved. | 02-19-2009 |
20090289638 | MICROWAVE READOUT FOR FLUX-BIASED QUBITS - A method for determining whether a quantum system comprising a superconducting qubit is occupying a first basis state or a second basis state once a measurement is performed is provided. The method, comprising: applying a signal having a frequency through a transmission line coupled to the superconducting qubit characterized by two distinct, separate, and stable states of differing resonance frequencies each corresponding to the occupation of the first or second basis state prior to measurement; and measuring at least one of an output power or phase at an output port of the transmission line, wherein the measured output power or phase is indicative of whether the superconducting qubit is occupying the first basis state or the second basis state. | 11-26-2009 |
20100019778 | PHYSICAL PROPERTY SENSOR WITH ACTIVE ELECTRONIC CIRCUIT AND WIRELESS POWER AND DATA TRANSMISSION - Wireless sensors configured to record and transmit data as well as sense and, optionally, actuate to monitor physical properties of an environment and, optionally, effect changes within that environment. In one aspect, the wireless sensor can have a power harvesting unit; a voltage regulation unit, a transducing oscillator unit, and a transmitting coil. The voltage regulation unit is electrically coupled to the power harvesting unit and is configured to actuate at a minimum voltage level. The transducing oscillator unit is electrically coupled to the voltage regulation unit and is configured to convert a sensed physical property into an electrical signal. Also, the transmitting coil is configured to receive the electrical signal and to transmit the electrical signal to an external antenna. | 01-28-2010 |
20100225332 | PROXIMITY SENSOR - A proximity sensor has an oscillation circuit, an amplitude measurement circuit, a control circuit and a signal processing circuit. The oscillation circuit has an LC resonant circuit and an oscillation control circuit that is configured to supply an electric current to the LC resonant circuit to generate oscillating voltage across the LC resonant circuit. The amplitude measurement circuit is configured to produce an amplitude signal corresponding to the amplitude of the oscillating voltage. The control circuit is configured to set the negative conductance of the oscillation control circuit to a critical value by which the LC resonant circuit can oscillate based on the amplitude signal. The signal processing circuit is configured to produce a distance signal corresponding to the distance between an object and the sensing coil based on a parameter associated with the negative conductance. | 09-09-2010 |
20110018555 | Electrical Measuring Device, Method and Computer Program Product - The invention relates to an electrical measuring device for performing an electrical impedance measurement in a contactless manner. The measuring device comprises a measuring unit which is provided with the impedance to be measured and a passive resonance circuit connected thereto for generating a measuring signal to be wirelessly received by a separate active transmitting and receiving unit for determination of the electrical impedance, upon wireless reception of an interrogation signal transmitted by the active transmitting and receiving unit. Further, the measuring unit is provided with an additional reference circuit which is preferably connected to the resonance circuit for, depending upon the interrogation signal, generating a reference signal to be received by the active transmitting and receiving unit. | 01-27-2011 |
20110062967 | VLF Test Generator - Disclosed is a very low frequency test generator for generating a high voltage having a low frequency in order to test the insulation of capacitive loads, in particular power cables. Said VLF test generator comprises two oscillators, the frequencies of which differ from one another by twice said low frequency, a resonance circuit which is fed in an interfering manner by the oscillators, is adjusted to the oscillator frequencies and causes a voltage rise of the interfering oscillator frequencies, and a demodulator for disconnecting the low-frequency high voltage generated by the interference from the resonance circuit and applying the same to the load. | 03-17-2011 |
20110193569 | Oscillator Circuit with RF Suppression - An oscillator circuit includes a phase-locked loop, a crystal resonator, first and second capacitors, and first and second impedance elements. The phase-locked loop is coupled between a first node and a second node. The crystal resonator is also coupled between the first node and the second node. The first capacitor is coupled between the first node and ground, and the second capacitor is coupled between the second node and ground. The first impedance element is coupled in a first circuit path from the first node to ground through the first capacitor. The second impedance element is coupled in a second circuit path from the second node to ground through the second capacitor. | 08-11-2011 |
20110248727 | Method for Compensation of System Tolerances in Inductive Couplers - A method is disclosed for compensation of system tolerances in an inductive coupler which includes a power generator that feeds an alternating current into a series resonance circuit formed by a resonance capacitor and an inductive rotating transmission device. First, a brief sequence of at least one period of an alternating current is fed by the power generator into the series resonance circuit. Then the series resonance circuit is short-circuited. A first resonance frequency is measured. Then a longer sequence having a plurality of periods of an alternating-current voltage is generated by the power generator, so that a given small voltage is built up at the load. Now a second resonance frequency is measured whilst the resonance circuit is short-circuited. Then at least one correcting variable for the power generator is determined from the two resonance frequencies. | 10-13-2011 |
20110260739 | Method and System for Testing Wind Turbine Plants - The present invention relates to a method and a system for on-site and full-scale testing of wind turbine plants. In particular, the present invention relates to a method and a system applying resonance circuits tuned with the fundamental frequency, or harmonics thereof, of a power supply grid connected to a wind turbine plant to be tested. The wind turbine plant to be tested may remain connected to the power supply grid during on-site and full-scale testing. | 10-27-2011 |
20120161787 | TEMPERATURE-INDEPENDENT CHEMICAL AND BIOLOGICAL SENSORS - Methods and sensors for selective fluid sensing are provided. A sensor includes a resonant inductor-capacitor-resistor (LCR) circuit and a sensing material disposed over a sensing region. The sensing region comprises at least a portion of the LCR circuit. Temperature-dependent response coefficients of inductance L, capacitance C, and resistance R properties of the LCR circuit and the sensing material are at least approximately 5 percent different from one another. The difference in the temperature-dependent response coefficients of the properties of the LCR circuit and the sensing material enables the sensor to selectively detect analyte fluids from an analyzed fluid mixture substantially independent of temperature. | 06-28-2012 |
20120235690 | METHODS FOR ANALYTE DETECTION - A method is provided for selectively detecting the presence and concentration of at least four analytes in a mixture. In certain embodiments, the method comprises contacting a single sensor with the mixture of analytes, wherein the sensor comprises at least one resonant sensor circuit comprising a sensing material that comprises at least two material properties that change in the presence of four or more analytes in their mixtures, and generating a multivariate sensor response pattern. The methods disclosed herein further optionally comprise performing analyte classification and analyte quantitation. Methods for selectively detecting the concentration of at least one analyte in a mixture further comprising at least one interference are also described in the instant application. | 09-20-2012 |
20120313649 | Physical Property Sensor With Active Electronic Circuit And Wireless Power And Data Transmission - Wireless sensors configured to record and transmit data as well as sense and, optionally, actuate to monitor physical properties of an environment and, optionally, effect changes within that environment. In one aspect, the wireless sensor can have a power harvesting unit; a voltage regulation unit, a transducing oscillator unit, and a transmitting coil. The voltage regulation unit is electrically coupled to the power harvesting unit and is configured to actuate at a minimum voltage level. The transducing oscillator unit is electrically coupled to the voltage regulation unit and is configured to convert a sensed physical property into an electrical signal. Also, the transmitting coil is configured to receive the electrical signal and to transmit the electrical signal to an external antenna. | 12-13-2012 |
20130181726 | TOUCH SURFACE AND METHOD OF MANUFACTURING SAME - A device for detecting and quantifying a force applied on a surface comprising a test specimen, an electrically insulating substrate, a first electrode bound to the substrate, a second electrode, an assembly of conductive or semi-conductive nanoparticles in contact with the two electrodes, and a measurement device. The measurement device provides proportional information with respect to an electrical property of the nanoparticles assembly. The electrical property is measured between the first and second electrode. The test specimen is the nanoparticles assembly itself and the electrical property is sensitive to the distance between the nanoparticles of the assembly. The invention uses the nanoparticles assembly itself as a test specimen and allows a force to be quantified even if the nanoparticles assembly is deposited on a rigid substrate. | 07-18-2013 |
20140347075 | POSITION DETECTION DEVICE - A detection coil is incorporated in a self-oscillation circuit. The oscillation frequency of the self-oscillation circuit, which comprises the coil and a capacitor, is set to a high frequency band (e.g., around 1 MHz or higher). A target section whose relative position to the coil section varies in response to displacement of a detection object, and includes a magnetism-responsive member constructed to cause inductance of the coil to vary with the relative position. A rectifier circuit extracts an amplitude level of an oscillation output signal of the self-oscillation circuit and outputs the extracted level as detected position data. For example, a plurality of self-oscillation circuits are provided. Alternatively, a single self-oscillation circuit forms a plurality of series circuits by, for each coil pair, connecting in series the two coils of the coil pair, and includes the result of connecting the series circuits in parallel as an inductor element for self-oscillation. | 11-27-2014 |
20150123679 | SYSTEM AND METHOD FOR MEASURING VARIABLE IMPEDANCE ELEMENTS IN A WIRELESS SENSOR - A wireless remote sensor ( | 05-07-2015 |
20150292912 | Sanitary Appliance and Method of Determining Use Thereof - The sanitary appliance comprising a receptacle provided with a flow surface and further comprising at least one sensor for sensing flow of urine (a physiological solution) located at a distance from the flow surface of the receptacle, characterised in that the sensor comprises a resonance circuit. Urine flow may be identified at the flow surface in that: (1) a first voltage is provided to a resonance circuit to be modified into a second voltage; (2) the second voltage is sensed and (3) the second voltage is compared with a reference value for identification of urine flow. Furthermore a dirt layer with a thickness at the flow surface may be identified. | 10-15-2015 |
20160103084 | CONVEYOR BELT MEASURING SYSTEM - A conveyor belt and a sensing system for sensing various conditions on a conveyor belt. The belt includes an array of sensing elements embedded in the belt to measure belt conditions. The sensing elements form parts of passive resonant circuits that each include a capacitor and an inductive coil. The capacitor or the inductive coil can be a sensing element. Measuring circuits external to the belt are inductively or capacitively coupled to the resonant circuits in the belt as they pass closely by. The sensing elements change the resonant frequency of their resonant circuits as a function of the sensed conditions. Frequency detectors in the measuring circuits measure that frequency change and convert it into a functionally related value used to determine a belt condition. Exemplary conditions include temperature, pressure, humidity, spillage, and product weight. | 04-14-2016 |
20160252553 | FREQUENCY CHARACTERISTIC MEASUREMENT METHOD | 09-01-2016 |