By Frequency Signal Response, Change Or Processing Circuit Patents (Class 324/674)
  • Patent number: 10746684
    Abstract: A sensor system can be configured to perform dielectric spectroscopy (DS). For example, the system can include a sensor configured to measure dielectric permittivity of a fluid in response to an RF input signal. Associated interface electronics can include a transmitter to drive the sensor with the RF input signal and a receiver to receive and process an RF output signal from the sensor in response to the RF input signal.
    Type: Grant
    Filed: May 10, 2018
    Date of Patent: August 18, 2020
    Assignee: CASE WESTERN RESERVE UNIVERSITY
    Inventors: Pedram Mohseni, Michael S. Suster, Mehran Bakhshiani, Umut Gurkan
  • Patent number: 9587964
    Abstract: Capacitive proximity detection is provided by combining a delta-sigma modulator and a capacitive voltage divider circuit to create a high resolution capacitive-to-digital converter. Period and duty cycle counters provide duty cycle ratios from the delta-sigma modulator for comparison of changes in capacitance values of a capacitive sensor when an object is in proximity thereto.
    Type: Grant
    Filed: June 11, 2014
    Date of Patent: March 7, 2017
    Assignee: MICROCHIP TECHNOLOGY INCORPORATED
    Inventor: Keith Curtis
  • Patent number: 9335287
    Abstract: Contacting a pair of electrodes with soil, applying an alternate current input electric signal to one of the pair of electrodes, comparing a phase of an output electric signal from the other of the pair electrodes with a phase of the input electric signal; and determining the concentration of the ionic solute included in the solvent according to a difference of the phases. The difference of the phases is not dependent on the water content. An electrical conductivity is proportional to a water content and ion concentration, thereby, the water content of soil is available according to the measured electrical conductivity, while determining the ion concentration.
    Type: Grant
    Filed: June 14, 2011
    Date of Patent: May 10, 2016
    Assignee: National University Corporation Toyohashi University of Technology
    Inventors: Masato Futagawa, Kazuaki Sawada
  • Patent number: 9182855
    Abstract: A method for adjusting a touch sensitivity of a touch sensor in a portable terminal and an apparatus thereof are provided. The method includes measuring a permittivity of an object located within a preset distance by a grip sensor disposed at a rear portion of the portable terminal when the touch sensor turned-on, and setting and adjusting a touch sensitivity corresponding to the measured permittivity of the object corresponding to the touch sensor of the portable terminal. The method adjusts the touch sensitivity of a touch sensor in a portable terminal according to a peripheral environment to improve the touch sensitivity of the touch sensor.
    Type: Grant
    Filed: May 17, 2011
    Date of Patent: November 10, 2015
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Myung Geun Koh, Yi Kyu Min, Kyung Goo Lee, Byoung Il Son
  • Patent number: 9134447
    Abstract: An apparatus for use in detecting at least one object hidden behind a wall or surface such as a metal fastener finder or a metal stud finder including a handle and a flexible member. The handle has a proximal end and a distal end and has a size and shape for being grasped by a hand of a user. The flexible member extends from the distal end of the handle, is movable or bendable independently of the handle, and includes multiple magnetic elements that are spaced apart from each other such that when a magnetic element is attracted to at least one hidden object, the flexible member bends to accommodate magnetic attraction between the at least one magnetic element and the at least one hidden object.
    Type: Grant
    Filed: December 30, 2011
    Date of Patent: September 15, 2015
    Assignee: TCM GLOBAL INC.
    Inventors: Kevin Tin, Ken Ung
  • Patent number: 9080962
    Abstract: The invention relates to a device for analyzing the composition of the contents of a container, characterized in that it comprises spectral analysis means of the contents of the container for measuring the absorption of waves by the container and its contents, and means (50) for providing information relative to the nature of the contents of said container (R) as a function of the absorption measuring.
    Type: Grant
    Filed: March 10, 2015
    Date of Patent: July 14, 2015
    Inventor: Alessandro Manneschi
  • Patent number: 9052065
    Abstract: Embodiments of the disclosure may include a dispenser for dispensing a liquid. The dispenser may include a measurement chamber configured to receive the liquid, a temperature probe positioned within the measurement chamber, and a capacitance probe positioned within the measurement chamber. The capacitance probe may house the temperature probe. The dispenser may also include a first conduit fluidly coupled to the measurement chamber and configured to deliver the liquid out of the dispenser.
    Type: Grant
    Filed: November 28, 2011
    Date of Patent: June 9, 2015
    Assignee: GP STRATEGIES CORPORATION
    Inventor: Michael Mackey
  • Patent number: 8981797
    Abstract: An apparatus for determining a dielectric property of a capacitor arrangement, having an alternating signal generator for applying an electric alternating signal to the capacitor arrangement. It further contains an evaluation circuit for evaluating at least one electric measuring quantity of an electric signal tapped from the capacitor arrangement. It further comprises balancing means which are arranged in an electric path between the alternating signal generator and the capacitor arrangement and by means of which a parameter of the electric alternating signal can be changed in such a way that an output signal of the evaluation circuit assumes a specific value, preferably zero, under defined constant conditions. Control means are provided for emitting an electric control signal to the balancing means, by means of which the change of the at least one parameter can be controlled. The apparatus can thus be balanced in a simple, rapid, cost-effective and especially automatic way.
    Type: Grant
    Filed: October 12, 2009
    Date of Patent: March 17, 2015
    Assignee: Uster Technologies, AG
    Inventor: Reto Gehrig
  • Patent number: 8957688
    Abstract: An apparatus for determining at least one dielectric property of a capacitor arrangement, and especially for capacitive examination of a moving elongated test subject such as yarn. It contains an alternating signal generator for applying an electric alternating signal to the capacitor arrangement. The capacitor arrangement is uncoupled from the alternating signal generator by means of an amplifier in such a way that it does not relevantly influence the basic frequency and the signal shape of the applied alternating signal. Detection means detect an electric measuring variable of an electric signal tapped from the capacitor arrangement. The alternating signal generator is set up in such a way that at least one of the basic frequency and the signal shape of the applied alternating signal can be changed.
    Type: Grant
    Filed: October 12, 2009
    Date of Patent: February 17, 2015
    Assignee: Uster Technologies, AG
    Inventor: Reto Gehrig
  • Publication number: 20140049272
    Abstract: A dual-electrode occupant detection system configured to determine an occupant presence on a seat assembly. The system includes two electrodes that each generates an electric field in response to an applied excitation signal. The two electrode signals arising therefrom can be measured individually and/or combined to detect more reliably an occupant. Such a configuration advantageously avoids the added expense and complication of an electrode arrangement that relies on an underlying shield layer to reduce electrode signal degradation caused by a seat heater element.
    Type: Application
    Filed: August 14, 2012
    Publication date: February 20, 2014
    Applicant: DELPHI TECHNOLOGIES, INC.
    Inventors: Kevin D. Kincaid, Duane D. Fortune, Morgan D. Murphy, Robert K. Constable
  • Patent number: 8653837
    Abstract: A sensor system and an evaluation method for monitoring surroundings on a mechanical component, having at least one capacitive sensor element that is attachable on the surface of machines or machine parts, in which at least one sensor element is made up of a layered structure of flexible, electrically conductive and electrically insulating layers, electrically conductive surfaces of one layer being positioned with lateral spacing above insulating layers lying between them in such a way that electrical field lines form between the conductive surfaces, which change measurably upon approach to and/or contact with a body or object.
    Type: Grant
    Filed: August 30, 2010
    Date of Patent: February 18, 2014
    Assignee: Robert Bosch GmbH
    Inventor: Joachim Frangen
  • Patent number: 8531197
    Abstract: An integrated circuit die comprises an electronic circuit and one or more output ports for outputting signals from the die via an external impedance, to a load, external from the die. The output port is connected to the electronic circuit. The die is further provided with an on-die sampling oscilloscope circuit connected to the output port, for measuring a waveform of the outputted signals.
    Type: Grant
    Filed: July 17, 2008
    Date of Patent: September 10, 2013
    Assignee: Freescale Semiconductor, Inc.
    Inventors: Yefim-Haim Fefer, Valery Neiman, Sergey Sofer
  • Patent number: 8519726
    Abstract: A sensor having integrated electrodes in a single sensor configuration, which is operated by alternating current (AC) including periodic electrical excitation signals of the respective multiple frequencies with the same amplitude for detecting analytes in fluids. The sensor applies a total of an odd number of the identical conductors serving as the respective electrodes, which are positioned equally spaced apart, in order, alignment and parallel with each other. The odd numbered conductors of the total conductors are connected in parallel by a first electrically conducting means serving as a first electrical pole to form a first group of the integrated electrodes. The even numbered conductors are connected in parallel by a second electrically conducting means serving as a second electrical pole to form a second group of the integrated electrodes. The present invention sensor possesses properties of high output, reduced physical size and improved electrical characteristics.
    Type: Grant
    Filed: March 24, 2010
    Date of Patent: August 27, 2013
    Inventor: Yizhong Sun
  • Patent number: 8456177
    Abstract: An occupant detection system that includes an electrode arranged proximate to an expected location of an occupant for generating an electric field between the electrode and the occupant proximate thereto. An electrical network coupled to the electrode forms a resonant circuit that includes the occupant as part of the resonant circuit. A controller coupled to the resonant circuit is configured to determine a resonant frequency of the resonant circuit indicative of an occupant presence, and a network signal magnitude at the resonant frequency indicative of a humidity value proximate to the electrode. 7. A method for detecting a vehicle applies an excitation signal to the resonant circuit, determine a resonant frequency of the resonant circuit and determines a humidity value based on a network signal magnitude at the resonant frequency.
    Type: Grant
    Filed: August 7, 2012
    Date of Patent: June 4, 2013
    Assignee: Delphi Technologies, Inc.
    Inventors: Dennis P. Griffin, Mark C. Hansen
  • Patent number: 8446157
    Abstract: A capacitance meter including an AC source providing a measurement voltage with a measurement frequency to a capacitor. A current sensor is arranged to measure a current going to or from the capacitance meter. A voltage sensor is arranged to measure a voltage over the capacitor. A capacitance calculation unit is arranged to calculate, using a controller, a capacitance of the capacitor using a measured current from the current sensor, a measured voltage from the voltage sensor and the measurement frequency. The capacitance meter is arranged to obtain measurements using the current sensor and the voltage sensor during a measurement duration. The measurement frequency and the measurement duration are selected such that the measurement duration equals a multiple of the period of the measurement frequency, and the measurement duration equals a multiple of the period of a mains electricity.
    Type: Grant
    Filed: September 17, 2010
    Date of Patent: May 21, 2013
    Assignee: ABB Technology AG
    Inventor: Hans Olof Fröjd
  • Patent number: 8432171
    Abstract: An analyte concentration, in a sample fluid, is determined by differential measurement. Two or more capacitive field effect sensors have an identical basic structure and are arranged in a shared measuring cell. One of the sensors forms a measuring sensor with an active transductor layer. Another sensor forms a reference sensor without an active transductor layer. The sensors are contacted with the sample fluid and the sensors, have an associated reference electrode, or have a shared reference electrode. A bias voltage composed of an electric DC voltage and a superimposed AC voltage is applied between each sensor and associated reference electrode(s) Capacitance changes due to the analyte are eliminated by controlling the bias voltage applied to the measuring sensor in a closed control loop. A measuring signal is obtained by calculating a difference between voltage values representative of DC voltage potentials applied to the measuring sensor and reference sensor, respectively.
    Type: Grant
    Filed: April 28, 2010
    Date of Patent: April 30, 2013
    Assignee: Buerkert Werke GmbH
    Inventors: Thomas Coppe, Jean-Luc Henry, Michael Schoening
  • Publication number: 20120326733
    Abstract: A liquid sensor may comprise an electrode unit and a calculating unit. The electrode unit may be capable of respectively connecting with a first oscillating unit and a second oscillating unit. The first oscillating unit may output a first frequency signal having an amplitude of Vin1 and an angular velocity of ?1. The second oscillating unit may output a second frequency signal having an amplitude of Vin2 and an angular velocity of ?2. The calculating unit may calculate a capacitance C1 of the electrode unit.
    Type: Application
    Filed: June 15, 2012
    Publication date: December 27, 2012
    Inventor: Nobuhiro Kato
  • Patent number: 8264243
    Abstract: A capacitance sensing section senses a capacitance between first and second electrodes. A temperature sensing section senses fuel temperature. A microcomputer functions as a concentration sensing section and senses a concentration of ethanol contained in fuel based on the capacitance sensed by the capacitance sensing section and the temperature sensed by the temperature sensing section. The microcomputer functions as an abnormality detecting section and performs abnormality determination to determine that an abnormality has occurred in the capacitance sensing section when the capacitance sensed by the capacitance sensing section does not change and the temperature sensed by the temperature sensing section changes. Since a dielectric constant has such a temperature characteristic that the dielectric constant changes with the temperature, the abnormality detecting section can detect occurrence of the abnormality in the capacitance sensing section.
    Type: Grant
    Filed: April 16, 2010
    Date of Patent: September 11, 2012
    Assignee: Denso Corporation
    Inventors: Jun Tarui, Akikazu Uchida, Toshiki Annoura, Hiroshi Katsurahara, Takayoshi Nakamura
  • Patent number: 8248087
    Abstract: A liquid concentration measuring device has first and second switches, which are turned on and off at two frequencies. When the first switch is turned on and the second switch is turned off, a detection electrode pair is charged. When the first switch is turned off and the second switch is turned on, the positive side of the detection electrode pair is grounded so that the charged detection electrode pair discharges. The difference between the output voltages of an amplifier produced by charging and discharging the detection electrode pair at the two frequencies is used to determine an alcohol concentration in gasoline.
    Type: Grant
    Filed: March 18, 2009
    Date of Patent: August 21, 2012
    Assignee: Denso Corporation
    Inventors: Hirotsugu Ishino, Jun Tarui
  • Patent number: 8242784
    Abstract: A test structure for testing electrical properties of a material comprises a first loop and a second loop, which are connected to form a closed test loop. A signal generator, for generating a test signal, is coupled to the first loop and the second loop. A signal propagation switching logic is coupled to the first loop and to the second loop for alternatingly flipping the test signal between the first and second loops, such that the test signal moves uninterrupted through the closed test loop. A probe logic detects any degradation of the test signal as the test signal travels along the closed test loop.
    Type: Grant
    Filed: December 7, 2009
    Date of Patent: August 14, 2012
    Assignee: International Business Machines Corporation
    Inventors: Vinh B. Lu, Bhyrav M. Mutnury, Terence Rodrigues
  • Patent number: 8237454
    Abstract: Measuring device for local measurement of an electrical property of the content of a container, wherein at least three electrodes are disposed adjacently of each other in height direction and electrically insulated from each other, wherein each of the electrodes can be connected to an electrical measuring circuit for measuring, via one of the electrodes and one other electrode connected to an electrical earth, the electrical property of the content of the container in the vicinity of the electrodes, and wherein the electrical measuring circuit is adapted to generate at least one electric measuring signal representing the measured electrical property, and a control unit for connecting the one electrode to the electrical measuring circuit and connecting the other electrode to an electrical earth.
    Type: Grant
    Filed: December 5, 2008
    Date of Patent: August 7, 2012
    Assignee: Fluid Well Instruments B.V.
    Inventors: Marian Jozef Slezak, Cornelis Wijnand Schoenmakers
  • Patent number: 8174272
    Abstract: Several apparatuses and a method for enabling of analysis of a material based on capacitive technology are disclosed. In an embodiment, the apparatus includes a first conductive surface. A second conductive surface is located substantially parallel to the first conductive surface. A measurement module measures a change in capacitance produced when a material is passed between the first conductive surface and the second conductive surface. The apparatus may include a database comprising a capacitance value of the material. A change in capacitance may be compared to the database to generate an identity of the material. A reference capacitor may enable the measurement module to adjust the measurement based on an environmental condition.
    Type: Grant
    Filed: December 23, 2008
    Date of Patent: May 8, 2012
    Assignee: YPoint Capital, Inc.
    Inventor: Divyasimha Harish
  • Patent number: 8143904
    Abstract: The present invention provides a reliable, non-invasive, electrical test method for predicting satisfactory performance of electrostatic chucks (ESCs). In accordance with an aspect of the present invention, a parameter, e.g., impedance, of an ESC is measured over a frequency band to generate a parameter functions. This parameter function may be used to establish predetermined acceptable limits of the parameter within the frequency band.
    Type: Grant
    Filed: October 10, 2008
    Date of Patent: March 27, 2012
    Assignee: Lam Research Corporation
    Inventors: Hong Shih, Saurabh Ullal, Tuochuan Huang, Yan Fang, Jon McChesney
  • Patent number: 8085247
    Abstract: An oscillating signal of relatively precise frequency is generated by tuning an oscillator using an external stable oscillating source as a reference. Calibration logic is included to compare a signal from the local oscillator to the reference signal and vary the local signal to a desired frequency. In one embodiment, a binary search algorithm is used to tune the local oscillator. The local oscillating signal can be sent to one or more circuits including at least one sensor of a touch sensitive panel for detecting touch events.
    Type: Grant
    Filed: January 3, 2007
    Date of Patent: December 27, 2011
    Assignee: Apple Inc.
    Inventor: Thomas James Wilson
  • Patent number: 8058883
    Abstract: Disclosed herein is a method for detecting capacitance including: allowing an oscillator to output a plurality of time division oscillation frequencies according to the capacitance detected by a capacitance detection plate; counting the plurality of time division oscillation frequencies during a predetermined time period; and offsetting increasing and decreasing of the oscillation frequencies due to noise such that a count value becomes uniform over the predetermined time period. Even when external noise is applied, distortion of the oscillation frequency due to the external noise is minimized and the oscillation frequency varies depending on only the capacitance of the capacitance detection plate. Accordingly, it is possible to prevent an error due to the noise at the time of the detection of the capacitance.
    Type: Grant
    Filed: March 14, 2007
    Date of Patent: November 15, 2011
    Assignee: AD Semiconductor Co., Ltd.
    Inventor: Sang-Chuel Lee
  • Patent number: 8044838
    Abstract: A method for determining a phase constant for a dielectric medium is provided. The method includes deploying a calibration object with a known free-space spectral response within a dielectric medium of interest, determining the spectral response of the calibration object deployed in the dielectric medium, and determining the phase constant for the dielectric medium using a relationship between the free-space spectral response of the calibration object and the spectral response of the calibration object when deployed in the dielectric medium.
    Type: Grant
    Filed: August 13, 2008
    Date of Patent: October 25, 2011
    Assignee: The Boeing Company
    Inventors: Samuel Allan Barr, William David Maynard
  • Publication number: 20110181304
    Abstract: An apparatus for determining a dielectric property of a capacitor arrangement, having an alternating signal generator for applying an electric alternating signal to the capacitor arrangement. It further contains an evaluation circuit for evaluating at least one electric measuring quantity of an electric signal tapped from the capacitor arrangement. It further comprises balancing means which are arranged in an electric path between the alternating signal generator and the capacitor arrangement and by means of which a parameter of the electric alternating signal can be changed in such a way that an output signal of the evaluation circuit assumes a specific value, preferably zero, under defined constant conditions. Control means are provided for emitting an electric control signal to the balancing means, by means of which the change of the at least one parameter can be controlled. The apparatus can thus be balanced in a simple, rapid, cost-effective and especially automatic way.
    Type: Application
    Filed: October 12, 2009
    Publication date: July 28, 2011
    Applicant: USTER TECHNOLOGIES AG
    Inventor: Reto Gehrig
  • Publication number: 20100332170
    Abstract: Disclosed herein is a novel sensing technique, termed Multiple Excitation Capacitance Polling (MECaP), that improves the efficiency of Electrical Capacitance Tomography (ECT). Unlike traditional alternating current techniques, where excitation signal is applied to an electrode one at a time, MECaP involves simultaneously applying multiple excitation signals, in a progressively increasing fashion, to multiple electrodes on an ECT sensor. The received signals are filtered or otherwise decomposed (e.g., Fourier transformed) into different components, and the individual components are used to generate an image of the article or substance disposed between the electrodes. Because multiple capacitances can be simultaneously measured as a consequence, scanning with MECaP can significantly increase the image scanning speed. For example, scanning with MECaP may enable frames rates of tens of kHz for imaging dynamic processes such as engine combustion.
    Type: Application
    Filed: June 29, 2010
    Publication date: December 30, 2010
    Inventors: Robert X. Gao, Zhaoyan Fan
  • Patent number: 7831205
    Abstract: Disclosed are embodiments of methods and systems for wireless data transmission by magnetic induction. In one embodiment, a network of magnetic induction units is provided. The units may be configured to transmit a data signal by modulation of a time-varying magnetic field. One or more units may also be configured to receive a data signal received from another magnetic induction unit. In one specific implementation, a network of underground magnetic induction units is provided, each having a sensor connected thereto. Each of the units, or a subset of the units, may be configured to transmit its sensed data to an adjacent or nearby unit, which, in turn, may retransmit the original data, along with additional appended data, to another adjacent unit. The network data may thereby be relayed in a multi-hop fashion until it reaches a desired destination.
    Type: Grant
    Filed: June 15, 2007
    Date of Patent: November 9, 2010
    Assignee: Utah State University
    Inventors: Nathan Jack, Krishna Shenai
  • Publication number: 20100277186
    Abstract: In an occupant detection system, which comprises an electrode arrangement for being placed into the seat of an automotive vehicle, the electrode arrangement including an antenna electrode for emitting an electric field into a detection region above the vehicle seat, and an evaluation circuit operatively connected to the antenna electrode, the evaluation circuit is configured and arranged so as to measure a capacitance influenceable by an occupying item in the detection region through interaction of the occupying item with the electric field. The evaluation circuit is further configured and arranged so as to determine fluctuations of the measured capacitance; analyse a frequency spectrum of the fluctuations; and derive an occupancy state of the vehicle seat based on both the measured capacitance and the frequency spectrum.
    Type: Application
    Filed: September 9, 2008
    Publication date: November 4, 2010
    Applicant: IEE INTERNATIONAL ELECTRONICS & ENGINEERING S.A.
    Inventors: Werner Bieck, Christian Bour, Yves Decoster, Guenter Goedert, Laurent Lamesch, Pierre Orlewski
  • Patent number: 7812622
    Abstract: A fluid sensor is constructed to have a pair of electrodes whereas between electrodes there are not additional materials designated to adsorb analytes if their concentrations are high, or there are adsorbents if the analyte concentrations are low. An alternating current voltage of varying frequencies is applied to the electrodes of the sensor by an alternating current device. In return, it detects electrical properties such as impedance and its components, reactance, resistance, and phase angles of the sensor with analytes whereas the analytes reside in or pass through the electrodes at each frequency. Thus a spectrum of electrical properties of the analyte can be established at various applied frequencies. The electrical properties are analyzed by a pattern recognition process, and compared with those of the known fluids. Therefore, the fluid can be detected and identified. A reference sensor is provided with the same configuration of the fluid sensor.
    Type: Grant
    Filed: July 8, 2008
    Date of Patent: October 12, 2010
    Inventor: Yizhong Sun
  • Patent number: 7741950
    Abstract: The invention relates to a humidity sensor comprising a sensor element, a molding, which preferably consists of a thermoplastic material or a two-component polyurethane, epoxy or silicone casting and which is adapted to adhere to the sensor element, a dead-space volume, which is arranged in connection with the sensor element and which is covered by a membrane. The membrane is attached to an external surface of the molding and is adapted to protect the sensor element from exposure to ambient moisture and dirt and allowing diffusion of ambient air gas molecules, like water vapor, into the dead-space volume. The dead-space volume is less than 100 mm3.
    Type: Grant
    Filed: October 17, 2005
    Date of Patent: June 22, 2010
    Assignee: Senmatic A/S
    Inventor: Kristian Ehrhorn
  • Patent number: 7724001
    Abstract: A circuit that senses a process variable includes a voltage divider that includes first and second capacitances. At least one of the capacitances is varied by the process variable. Divider ends receive modulated potentials, and a divider center tap coupled to a detector. The detector has a detector output representing carrier frequency range components. A control circuit controls a baseband envelope of the modulated potentials as a function of the detector output.
    Type: Grant
    Filed: March 26, 2007
    Date of Patent: May 25, 2010
    Assignee: Rosemount Inc.
    Inventor: Lowell A. Kleven
  • Patent number: 7696763
    Abstract: A fluid sensor is constructed to have a pair of electrodes whereas between electrodes there are not additional materials designated to adsorb analytes if their concentrations are high, or there are adsorbents if the analyte concentrations are low. An alternating current voltage of varying frequencies is applied to the electrodes of the sensor by an alternating current device. In return, it detects electrical properties such as impedance and its components, reactance, resistance, and phase angles of the sensor with analytes whereas the analytes reside in or pass through the electrodes at each frequency. Thus a spectrum of electrical properties of the analyte can be established at various applied frequencies. The electrical properties are analyzed by a pattern recognition process, and compared with those of the known fluids. Therefore, the fluid can be detected and identified. A reference sensor is provided with the same configuration of the fluid sensor.
    Type: Grant
    Filed: May 22, 2008
    Date of Patent: April 13, 2010
    Inventor: Yizhong Sun
  • Patent number: 7635984
    Abstract: An electric field sensor and a vehicle safety system comprise at least one first electrode, at least one second electrode, and at least one third electrode. The at least one second electrode is located between the at least one first electrode and the at least one third electrode. The at least one first electrode is located proximate to a region to be sensed by the electric field sensor, and the at least one second electrode is substantially the same size as the at least one first electrode.
    Type: Grant
    Filed: February 20, 2007
    Date of Patent: December 22, 2009
    Assignee: TK Holdings Inc.
    Inventors: James G. Stanley, Robert A. Stopper
  • Publication number: 20090302871
    Abstract: Disclosed herein is a method for detecting capacitance including: allowing an oscillator to output a plurality of time division oscillation frequencies according to the capacitance detected by a capacitance detection plate; counting the plurality of time division oscillation frequencies during a predetermined time period; and offsetting increasing and decreasing of the oscillation frequencies due to noise such that a count value becomes uniform over the predetermined time period. Even when external noise is applied, distortion of the oscillation frequency due to the external noise is minimized and the oscillation frequency varies depending on only the capacitance of the capacitance detection plate. Accordingly, it is possible to prevent an error due to the noise at the time of the detection of the capacitance.
    Type: Application
    Filed: March 14, 2007
    Publication date: December 10, 2009
    Applicant: AD SEMICONDUCTOR CO., LTD.
    Inventor: Sang-Chuel Lee
  • Patent number: 7619420
    Abstract: An apparatus includes a measurement device for measuring two capacitances. The apparatus also includes a display module that simultaneously displays at least two numerical values based on the measured capacitances.
    Type: Grant
    Filed: January 9, 2007
    Date of Patent: November 17, 2009
    Assignee: American Radionic Company, Inc.
    Inventor: Robert M. Stockman
  • Publication number: 20090160460
    Abstract: Several apparatuses and a method for enabling of analysis of a material based on capacitive technology are disclosed. In an embodiment, the apparatus includes a first conductive surface. A second conductive surface is located substantially parallel to the first conductive surface. A measurement module measures a change in capacitance produced when a material is passed between the first conductive surface and the second conductive surface. The apparatus may include a database comprising a capacitance value of the material. A change in capacitance may be compared to the database to generate an identity of the material. A reference capacitor may enable the measurement module to adjust the measurement based on an environmental condition.
    Type: Application
    Filed: December 23, 2008
    Publication date: June 25, 2009
    Inventor: DIVYASIMHA HARISH
  • Publication number: 20080309353
    Abstract: A touch sensor that includes sampling the output of a touch sensor circuit supplied with a high level carrier signal at least once, sampling the output of a touch sensor circuit supplied with a low level carrier signal at least once and thereby determining the occurrence of a touch by using at least one of said high level carrier samples and at least one of said low level carrier samples.
    Type: Application
    Filed: June 11, 2008
    Publication date: December 18, 2008
    Inventors: MAN KIT JACKY CHEUNG, ADAM JOHNSON
  • Patent number: 7459919
    Abstract: A device for checking the coating of anodized light-metal parts (e.g. Aluminum), in particular by TSA anodization, is described. The device has two contact electrodes on respective resilient probes, placed onto the surface of the component to be tested under a predefined contact pressure; an enabling device coupled to the probes that generates an enable signal when the predefined contact pressure is reached; and a conductivity measuring device coupled to the contact electrodes that measures the conductivity of the surface of the component under test. The conductivity measuring device is coupled to the enabling device to detect the enable signal. When the enable signal is detected, the conductivity measuring device measures the surface conductivity of the component under test between the contact electrodes and generates an output signal indicating the measured conductivity.
    Type: Grant
    Filed: November 2, 2007
    Date of Patent: December 2, 2008
    Assignee: Airbus Deutschland GmbH
    Inventors: Juergen Krueger, Gerhard Scheer
  • Publication number: 20080122456
    Abstract: A capacitive sensor for mounting to a body, particularly a body such as a van door (55). The sensor has a sensor plate (51) to which a first signal is applied. A first guard plate (52) is interposed between the sensor plate (51) and the body (55), and a second guard plate (53) is interposed between the first guard plate (52) and the body (55). The first and second guard plates (52, 53) each have signals applied thereto which are the same or at least similar to the first signal applied to the sensor plate (51). In this way, the second guard plate (53) acts as a rear guard to the first guard (52) and reduces its capacitance to ground. This reduces the current drawn by the first guard (52), allowing it to more accurately track the signal on the sensor and consequently better mask the sensor plate (51) from the body (55).
    Type: Application
    Filed: July 28, 2004
    Publication date: May 29, 2008
    Inventors: Anthony Moon, David Snell, Cynthia Anne Snell
  • Publication number: 20070266769
    Abstract: A device for the selective determination of the quantity of oil mist includes an impactor (1) with a micronozzle (4) for dispensing a predetermined volume of a gas to be tested, a baffle plate (5) arranged downstream of the micronozzle (4) for depositing oil particles. A window (7) is provided on the side of the baffle plate (5) facing away from the micronozzle (4).
    Type: Application
    Filed: April 11, 2007
    Publication date: November 22, 2007
    Applicant: DRAEGER SAFETY AG & CO. KGAA
    Inventors: Christian Luebbert, Harald Heyer, Andreas Mohrmann
  • Patent number: 7091727
    Abstract: A method and an integrated circuit for detecting capacitance variation includes the steps of: generating a detection frequency for capacitance variation and a detection frequency which lags the detection frequency by k times, wherein the detection frequencies are based on a time divisional format; operating the detection frequencies to produce a difference frequency; operating variation rate of the difference frequency; and comparing the variation rate of the difference frequency with a predetermined detection level, and outputting a signal indicative of capacitance variation if the variation rate of the difference frequency is greater than the detection level.
    Type: Grant
    Filed: September 1, 2005
    Date of Patent: August 15, 2006
    Assignee: AD Semiconductor Co., Ltd.
    Inventor: Sang-Chuel Lee
  • Patent number: 7042230
    Abstract: Systems and methodologies that provide for multi-parameter sensing via micro fabricated sensing structures operatively connected to oscillators, each micro-fabricated sensing structure in part defines a frequency of a respective associated oscillator. Output from such oscillators can be combined together, and then AC coupled with an incoming DC voltage that feeds the oscillators. The wiring arrangement includes two conducting paths/wires that carry a direct current to the oscillators as well as outputting the combined signal to external measurement devices. In addition, arrangements for pressure sensors are provided that mitigate errors from temperature variations and the induced stress/strains.
    Type: Grant
    Filed: February 28, 2005
    Date of Patent: May 9, 2006
    Inventor: Alain Izadnegahdar
  • Patent number: 6982560
    Abstract: According to an aspect of the invention, a method for determining near-end cross-talk effects is provided. A periodic test signal having a frequency increasing in predetermined steps is input into a conductor of a transmission cable. A raw cross-talk signal is received from another conductor of the transmission cable and the received cross-talk signal is processed in the frequency domain to determine a combination of near-end cross-talk components of the received cross-talk signal. The combination of near-end cross-talk components represents the characteristic of the near-end cross-talk effects.
    Type: Grant
    Filed: July 18, 2003
    Date of Patent: January 3, 2006
    Assignee: Agilent Technologies, Inc.
    Inventors: Harshang Pandya, Kanwaljeet Singh
  • Patent number: 6937951
    Abstract: Some embodiments provide a sensor element, a shield element capacitively coupled to the sensor element and to ground, a coupling circuit to receive an input signal, and to electrically couple the received input signal to the sensor element and to the shield element, an output circuit to generate an output signal, the output signal based on a capacitance between the sensor element and an object, and a classifier to determine a material based on the output signal, and to transmit a material signal to the output circuit based on the determined material, wherein the output circuit is adjustable based on the material signal.
    Type: Grant
    Filed: June 3, 2003
    Date of Patent: August 30, 2005
    Assignee: Siemens Medical Solutions USA, Inc.
    Inventors: William J. Gibb, Michael Smidebush, Francisco Miguel Hernandez-Guerra
  • Patent number: 6864691
    Abstract: A circuit arrangement for detecting the capacitance or capacitance change of a capacitive circuit element or component, in which there is a capacitive noise voltage compensation element, which corresponds to the sensor capacitor, represented as a noise voltage compensation capacitor, and a noise voltage compensation electrode of the noise voltage compensation capacitor, which corresponds to the first electrode of the sensor capacitor, is connected to the second electrode of a storage capacitor. The noise voltage compensation capacitor can be influenced in the same way as the sensor capacitor by the LF noise voltage. In this way, the adulteration of the measurement result by LF noise voltages which otherwise occurs no longer takes place.
    Type: Grant
    Filed: December 13, 2002
    Date of Patent: March 8, 2005
    Assignee: i f m electronic GmbH
    Inventors: Jaromir Palata, Joerg Schulz
  • Publication number: 20040251919
    Abstract: A method of determining the concentration of a component of interest within a fluid (22) within a container (24) includes determining a permittivity of the fluid, determining a conductivity of the fluid and determining the concentration of the component of interest based on a direct relationship between the determined permittivity and the determined conductivity. An example sensor for making such a concentration determination includes a capacitor portion (26) and control electronics (30) that operate the capacitor in a first mode for making the permittivity determination and a second mode for making the conductivity determination. An example data set (32) includes at least one three dimensional polynomial that describes a relationship between permittivity, conductivity and temperature for a particular concentration value. A disclosed example is well suited for making urea concentration level determinations.
    Type: Application
    Filed: June 16, 2004
    Publication date: December 16, 2004
    Applicant: Siemens VDO Automotive Corporation
    Inventors: Daniel Stahlmann, Isabelle McKenzie, Ray Wildeson, Daniel L. Childs
  • Patent number: 6777958
    Abstract: A method for detecting a change in capacitance of a capacitive sensing element having a nominal capacitance value is disclosed. In an exemplary embodiment, the method includes coupling the sensing element to a first oscillator, the first oscillator generating a first frequency dependent upon the capacitance value of the sensing element. The first frequency is compared to a reference frequency generated by a second oscillator. The change in capacitance from the nominal capacitance value is detected if the first frequency differs from said reference frequency by a determined frequency value.
    Type: Grant
    Filed: May 10, 2002
    Date of Patent: August 17, 2004
    Assignees: Delphi Technologies, Inc., Hughes Aircraft Company
    Inventors: Ronald Helmut Haag, John Pasiecznik, Jr.
  • Patent number: 6741083
    Abstract: An oscillating device to determine the purity of single or multi-component liquids on the basis of their dielectric permittivity, in a continuous procedure through the frequency change in the static permittivity region and with strict temperature control. The oscillator is connected to a standard thermoregulated measuring cell, a frequency meter and a power source. The improved characteristic is that the circuit does not contain the usual micrometer and standard capacitors and that it has a previously determined inductance to improve measurement conditions. In this manner, and operating in the region of static frequencies to avoid relaxation phenomena, a continuous measurement is achieved with a high degree of precision that had never been previously obtained. A measurement procedure is also disclosed that is carried out with the device.
    Type: Grant
    Filed: November 7, 2001
    Date of Patent: May 25, 2004
    Inventor: Maximo Baron