For Figure Of Merit Or Q Value Patents (Class 324/653)
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Patent number: 11218014Abstract: The present disclosure relates to a circuitry and a method for detecting a temperature of a wireless charging coil, and a storage medium. The circuitry includes: a target resistor, a voltage supply circuit, a voltage detection circuit, and a processing component. The voltage supply circuit is configured to apply a target voltage to the series circuit. The voltage detection circuit is configured to obtain a first measured voltage across two ends of the wireless charging coil and a second measured voltage across two ends of the target resistor. The processing component is configured to: determine a working current of the series circuit based on the second measured voltage and a resistance of the target resistor; determine a real-time resistance of the wireless charging coil based on the first measured voltage and the working current; determine a real-time temperature of the wireless charging coil based on the real-time resistance.Type: GrantFiled: August 30, 2019Date of Patent: January 4, 2022Assignee: BEIJING XIAOMI MOBILE SOFTWARE CO., LTD.Inventors: Chunjie Zhang, Hui Li
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Patent number: 9859094Abstract: In an image forming method of charged particle beam apparatus for scanning a sample by irradiating the sample with a converged charged particle beam and detecting secondary charged particles generated from the sample by a detection unit, receiving and processing an output signal from the detection unit, and receiving the processed signal and forming an image of the sample, receiving and processing the output signal are performed by analogically processing the output signal and by performing pulse-count processing on the output signal, and pulse-count processing is performed by removing a ringing pulse in the output signal and counting pulses in the signal from which the ringing pulse has been removed.Type: GrantFiled: November 30, 2016Date of Patent: January 2, 2018Assignee: HITACHI HIGH-TECHNOLOGIES CORPORATIONInventors: Wen Li, Kazuki Ikeda, Takuma Nishimoto, Hiroyuki Takahashi, Hajime Kawano
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Publication number: 20130063160Abstract: There is provided a sensing device including a circuit including at least a coil electromagnetically coupled to an outside; a temperature detection unit for detecting a temperature of the coil; a sensing unit for measuring a Q value of the circuit; and a correction unit for correcting the Q value measured by the sensing unit based on temperature information detected by the temperature detection unit.Type: ApplicationFiled: August 31, 2012Publication date: March 14, 2013Applicant: SONY CORPORATIONInventors: Hiroaki Nakano, Tomomichi Murakami, Osamu Kozakai, Kenichi Fujimaki
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Patent number: 6832507Abstract: The system comprises at least one electronic sensor for detecting the presence of moisture. The system further comprises at least one reading device for obtaining information from the sensor about the presence of moisture. The sensor comprises a resonant circuit which is at least partly formed from a moisture sensitive material, the electrical resistance of which increases when the material comes into contact with moisture. The reading device comprises transmitter-receiver means for generating an elecromagnetic interrogation field.Type: GrantFiled: September 19, 2001Date of Patent: December 21, 2004Assignee: Telesensing Holding B.V.Inventors: Jan van de Berg, Peter Hillebrand de Haan
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Patent number: 6583630Abstract: A distance measurement system is provided. The distance measurement system includes at least one resonant circuit, at least one magnetic element with predetermined magnetic properties, a transmitter operable to transmit an electromagnetic pulse, a receiver operable to detect oscillations emitted by said resonant circuit in response to said electromagnetic pulse, and an analyzer operable to analyze an amplitude envelope property of said oscillations, to thereby determine a distance between the resonant circuit and the magnetic element.Type: GrantFiled: January 31, 2001Date of Patent: June 24, 2003Assignee: IntelliJoint Systems Ltd.Inventors: Emanuel Mendes, David Mendes, Ruth Beer, Gilad Barak
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Patent number: 6528859Abstract: The present invention provides a foil wound low profile power L-C processor. A magnetic winding is disposed within a core. The magnetic winding can be made of one or more sets of conductive foil and insulation film wound together in a spiral pattern. The magnetic winding can also include dielectric film. The magnetic winding can have a center aperture in which a non-magnetic and non-conductive center post can be disposed. The center post can also be divided into portions with a combined length less than the length of the center aperture to form an air gap within the center aperture.Type: GrantFiled: May 11, 2001Date of Patent: March 4, 2003Assignee: Koninklijke Philips Electronics N.V.Inventor: Willem G. Odendaal
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Patent number: 6366096Abstract: An apparatus and method for accurately estimating the absolute value of surface resistances and penetration depths of metallic films and bulk samples. The apparatus carries out measurements using two nominally identical samples with flat sample surfaces which are brought together with a thin dielectric separation of variable thickness sandwiched between the samples in order to form a two-conductor parallel plate transmission line resonator which carries an electromagnetic wave. A liquid or gas of unknown dielectric properties fills the dielectric spacer. A resonant condition of the microwave signal is established and the resonant frequency and the quality factor Q are measured while the spacing between the sample plates is varied. The variation of the resonant frequency and Q with spacer thickness is then analyzed to yield absolute values of the sample surface resistance and penetration depth which are then further used for determination of absolute complex conductivity and surface impedance of the samples.Type: GrantFiled: August 4, 2000Date of Patent: April 2, 2002Assignee: University of Maryland, College ParkInventors: Vladimir V. Talanov, Steven Mark Anlage
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Patent number: 6345228Abstract: A road vehicle sensor provides an output signal having a magnitude which varies with time through a plurality of values as a vehicle passes the sensor. Signal processing apparatus monitors the timing of sensor signals generated from sensors in adjacent lanes of a highway and provides an indication when such sensor signals could correspond to a double count with a single vehicle being detected by both sensors. Then, the geometric mean of the amplitudes of the sensor signals from the sensors in adjacent lanes is calculated and is used to indicate a double count if the geometric mean is below a threshold value. Signal processing arrangements are also described to detect tailgating vehicles which may be simultaneously detected by a sensor, and for determining the length of slow moving or stationary traffic.Type: GrantFiled: August 5, 1998Date of Patent: February 5, 2002Assignee: Diamond Consulting Services LimitedInventor: Richard Andrew Lees
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Patent number: 6242938Abstract: An electric circuit for determining the load current of a clocked load having at least one inductive component and being assigned a free-wheeling circuit has a shunt whose voltage drop is used to determine the current. The shunt is arranged in the free-wheeling circuit to determine the free-wheeling current which is used as a measure for determining the load current (motor current). Furthermore, according to another embodiments the shunt is in series with the load and the free-wheeling circuit is arranged in parallel to the series connection of load and shunt.Type: GrantFiled: June 4, 1999Date of Patent: June 5, 2001Assignee: Robert Bosch GmbHInventor: Martin Kessler
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Patent number: 6025725Abstract: A planar electromagnetic resonator utilizes an electromagnetically active material located between the capacitive or inductive elements of the resonator. A microscopic electrical property of this material is altered by an external condition, and that alteration, in turn, affects the behavior of the resonator in a consistent and predictable manner.Type: GrantFiled: December 4, 1997Date of Patent: February 15, 2000Assignee: Massachusetts Institute of TechnologyInventors: Neil Gershenfeld, Richard Fletcher
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Patent number: 5869958Abstract: A method of determining a response characteristic of a microwave device includes coupling a microwave resonator to the device, loading the resonator with microwave radiation, monitoring the time decay of power from the resonator, and comparing the monitored time decay with a known characteristic of the time decay of radiation in the microwave resonator when loaded with radiation.Type: GrantFiled: May 19, 1997Date of Patent: February 9, 1999Assignee: The Secretary Of State For Trade And IndustryInventors: John Charles Gallop, Conway David Langham
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Patent number: 5420518Abstract: An electronic resonator is employed for the on-line nondestructive measurement of microstructure, as defined by the diameter of grains of the type found in ferritic steel alloys during high rate formation processes. The quality factor (Q) of an inductive-capacitive (LC) tank circuit is determined to obtain a measure of energy dissipated in a steel alloy sample inductively coupled to it. Dissipative energy in the sample results from two sources, hysteresis and eddy currents. Eddy current loss is relatively microstructure insensitive and is mainly related to chemical composition and temperature while hysteresis loss is determined by microstructural factors. If microstructural variables other than grain size, and the factors determining eddy current loss are held constant, grain size becomes the dominant factor in differential energy loss with grain size being inversely related to hysteresis loss.Type: GrantFiled: September 23, 1993Date of Patent: May 30, 1995Inventor: Kenneth L. Schafer, Jr.
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Patent number: 5142228Abstract: Method and apparatus for non-destructively monitoring the thickness and uniformity of electrically conductive coatings (12) that have been deposited upon optical waveguide fibers (10). The monitoring may be performed while coated fiber (22) is at rest or while it is in motion. Physical contact with fiber (22) is not required. Monitoring is accomplished by feeding coated fibers (22) through an inductive coil (24) while simultaneously measuring an electrical value that is dependent upon the electrical resistance of conductive coating (10) then passing through inductive coil (24). The electrical value measured for a given section of coated fiber (22) becomes indicative of the coating thickness and uniformity of the coating about optical waveguide fiber (10) by correlating the electrical value measured with previously measured electrical values generated by coated fibers having coatings of known thicknesses and having no bald spots or other non-uniformities.Type: GrantFiled: March 14, 1991Date of Patent: August 25, 1992Assignee: Corning IncorporatedInventor: Paul I. Kingsbury
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Patent number: 5072186Abstract: An electric coil to be tested for interturn and/or interlayer faults is coupled into a series resonant circuit. A measurement of the quality-factor (Q-factor) is carried out by measuring the overshoot voltage in circuit resonance. Through the selection of a suitable capacitance in the series resonant circuit, the resonant frequency can be placed in a range in which the quality-factor of the coil attains its maximum value. The coil to be tested is therefore a component of a series resonant circuit. The measuring system for determining the quality-factor of the coil is low capacitively coupled into the resonant circuit. Because the interturn resistance of the test coil must be measured in any event, since this value is also obtained during Q-factor measurement, the necessary operating and measuring periods can be optimized.Type: GrantFiled: February 1, 1990Date of Patent: December 10, 1991Assignee: Siemens AktiengesellschaftInventor: Wolfgang Trampert
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Patent number: 4968945Abstract: An apparatus and method for measurement of ohmic loss and surface resistivity is provided with a straight lumen waveguide with at least one opening at one end. Diffraction of radiation introduced to the lumen at one end of the tube provides feedback to establish resonances within the tube. Using the "whispering gallery" resonant modes maximizes the total ohmic loss and thereby enhances sensitivity of resistivity measurements. The angle at which resonant radiation exits the lumen is a function of the mode and size of the operative. Thus, preferred spatial detection allows enhancement of the device signal while discriminating against undesired modes. Selection of modes allows high frequency measurements, into the tetraherz range, to be made without disabling restrictions in the device dimensions, spatial input/output coupling or ohmic loss depending on alignment for analysis of, for example, high temperature superconductors.Type: GrantFiled: December 2, 1988Date of Patent: November 6, 1990Assignee: Massachusetts Institute of TechnologyInventors: Paul P. Woskov, Daniel R. Cohn