Induced Voltage-type Sensor Patents (Class 324/239)
  • Patent number: 11320400
    Abstract: The invention relates to a method for observing a magnetic field of a material volume, in particular for determining properties of a workpiece under, in particular, magnetic, mechanical, thermal, and/or electrical excitation of a material volume of the workpiece, wherein the magnetic field of the material volume is sensed as a function of time and of frequency with high frequency resolution.
    Type: Grant
    Filed: November 18, 2020
    Date of Patent: May 3, 2022
    Assignee: QASS GMBH
    Inventor: Ulrich Seuthe
  • Patent number: 11287495
    Abstract: A particle alignment method in accordance with at least one of the present inventions includes the step of positioning a cochlear implant, which is implanted within a patient's head and which includes a magnet apparatus with a central axis and magnetic material particles, at a location outside of the scanning area of an MRI system, adjacent to the MRI system, and within the MRI magnetic field in such a manner that the central axis of the magnet apparatus is at least substantially parallel to the MRI magnetic field.
    Type: Grant
    Filed: May 22, 2017
    Date of Patent: March 29, 2022
    Assignee: Advanced Bionics AG
    Inventors: James George Elcoate Smith, Sung Jin Lee, Jeryle L. Walter, Uli Gommel, Stephanie M. Reed
  • Patent number: 11270045
    Abstract: Aiming at a hardness mismatch phenomenon in the existing structure hardness design process according to an integral intensity viewpoint, the invention provides a quantitative matching design method for structure heat treatment-hardness distribution. The specific method comprises determining an ideal static intensity field distribution of the dangerous section of the structure according to a limit static stress distribution of a dangerous section of the structure; determining an ideal hardness distribution of the dangerous section of the structure by utilizing an intensity-hardness conversion relation; determining heat treatment requirements such as surface hardness, core hardness and the like by combining material and heat treatment mode; determining an actual hardness distribution of the dangerous section of the structure according to a material end quenching curve and the heat treatment requirement.
    Type: Grant
    Filed: March 13, 2020
    Date of Patent: March 8, 2022
    Assignee: University of Shanghai for Science and Technology
    Inventor: Xi Lu
  • Patent number: 11215584
    Abstract: A material defect detection device that detects a material defect in a predetermined region of metallic equipment using a magnetic field distribution in the predetermined region measured by a magnetic sensor array including a plurality of magnetic sensors, the material defect detection device including: a processor that calculates a density distribution of magnetic dipoles in the predetermined region based on the magnetic field distribution and calculates a depth distribution of material defect in the predetermined region based on the density distribution of the magnetic dipoles.
    Type: Grant
    Filed: October 23, 2017
    Date of Patent: January 4, 2022
    Assignee: YOKOGAWA ELECTRIC CORPORATION
    Inventors: Tetsuya Ishikawa, Hideki Yoshida
  • Patent number: 11193839
    Abstract: A system for measuring torque on a component having a residually magnetized region is provided. The system includes a torque sensor for sensing an electromagnetic characteristic of the component and transmitting a plurality of signals that are indicative of the electromagnetic characteristic. The system also includes a computer communicatively coupled to the torque sensor for receiving the signals. The computer includes a processor and a memory. The processor is programmed to determine, using the signals, that the torque sensor is affected by the residually magnetized region of the component.
    Type: Grant
    Filed: March 6, 2020
    Date of Patent: December 7, 2021
    Assignee: Baker Hughes, a GE Company, LLC
    Inventors: Dan Tho Lu, Brant Wilhelm
  • Patent number: 11165014
    Abstract: A semiconductor device includes a semiconductor substrate; a vertical Hall element including a magnetosensitive portion, and formed in the semiconductor substrate; and an excitation wiring provided above a surface of the semiconductor substrate and apart from the magnetosensitive portion. The excitation wiring is formed of a single wiring with a plurality of turns. The excitation wiring includes a plurality of main wiring portions arranged side by side, and apart from one another in an overlapping region that overlaps the magnetosensitive portion as viewed in plan view from a direction orthogonal to the surface of the semiconductor substrate; and auxiliary wiring portions connecting each of the plurality of main wiring portions to one another in series.
    Type: Grant
    Filed: March 20, 2020
    Date of Patent: November 2, 2021
    Assignee: ABLIC INC.
    Inventors: Yohei Ogawa, Hirotaka Uemura
  • Patent number: 11146121
    Abstract: A foreign material detection apparatus has, between a transmitter coil of a power transmitting apparatus and a receiver coil of a power receiving apparatus between which power is transmitted contactlessly, a plurality of first detection coils arranged to be inductively couplable with each other and each constituting a resonant circuit having a first resonant frequency together with a first capacitor, a plurality of second detection coils arranged to be inductively couplable with each other and each constituting a resonant circuit having a second resonant frequency together with a second capacitor, a power supply circuit that supplies, to each detection coil, AC power having a frequency at which the detection coil resonates, and a detection circuit that detects foreign material contamination between the transmitter coil and the receiver coil according to a voltage of the AC power transmitted via the detection coils.
    Type: Grant
    Filed: August 24, 2020
    Date of Patent: October 12, 2021
    Assignee: OMRON Corporation
    Inventors: Goro Nakao, Takanori Imazawa
  • Patent number: 11125721
    Abstract: Provided are a method for measuring the magnetic transformation rate of a steel sheet in an annealing furnace and an apparatus for measuring the same, and a continuous annealing process and a continuous galvanizing process which utilize the method and the apparatus. One such method includes delivering an alternating-current driving signal to the surface of the steel sheet by using an air-core driving coil having a size larger than, a width of the steel sheet, measuring the driving signal reflected by the steel sheet by using air-core receiving coils having a size larger than the width of the steel sheet, and determining the magnetic transformation rate of the steel sheet by using a measurement processing unit based on a distance between the steel sheet and the driving coil which has been corrected by using the measured values of the driving signal obtained by using the receiving coils.
    Type: Grant
    Filed: May 23, 2018
    Date of Patent: September 21, 2021
    Assignee: JFE Steel Corporation
    Inventors: Yoshimichi Hino, Hirokazu Sugihara
  • Patent number: 10989680
    Abstract: In one embodiment, assessing the quality of an adhesive bond of a composite material includes passing a vector electric field through a thickness of the composite material, measuring dielectric properties of the composite material, determining one or more dielectric parameters of the composite material, and comparing the one or more dielectric parameters with one or more reference dielectric parameters.
    Type: Grant
    Filed: May 25, 2018
    Date of Patent: April 27, 2021
    Assignee: Board or Regents, The University of Texas Systems
    Inventors: Kenneth L. Reifsnider, Md Rassel Raihan, Muthu Ram Prabhu Elenchezhian, Priyanshu Kumar Banerjee, Chaitanya Dave, Vamsee Vadlamudi
  • Patent number: 10989805
    Abstract: Methods and systems for outdoor advertising optimization and/or adaptive outdoor advertising are presented. One or more node signal receivers receive signals emitted by wireless network that are affected by physical phenomena such as reflections and scattering in the surrounding area. The received signals are processed to provide detection and tracking information regarding objects within a target volume. This information can then be employed to determine the optimal placement location or the optimal route for advertising platforms, and/or to select one or more advertisements on outdoor advertising platforms.
    Type: Grant
    Filed: July 18, 2019
    Date of Patent: April 27, 2021
    Inventor: Gil Zwirn
  • Patent number: 10809411
    Abstract: A metal detection system includes a detection module, a control module, a positioning module, and a computer module. The detection module includes an electromagnetic wave emitter that emits electromagnetic waves, and an electromagnetic wave receiver that senses electromagnetic signals emitted by underground metal in response to the electromagnetic waves emitted by the electromagnetic wave emitter. The control module processes the electromagnetic signals received by the electromagnetic wave receiver and generates metal detection data based on the received electromagnetic signals, or processes output signals provided by the detection module and generates metal detection data based on the output signals provided by the detection module. The positioning module generates information about positions of the metal detection device over time.
    Type: Grant
    Filed: December 12, 2017
    Date of Patent: October 20, 2020
    Inventor: Maoquan Deng
  • Patent number: 10775346
    Abstract: Disclosed is an apparatus and method for generating virtual inspection channels mid-way between the physical inspection channels of an eddy current array probe, thereby reducing the coverage loss and improving defect sizing and imaging. The method is based upon a calibration to determine the mid-channel coverage loss for parallel defects having their long axis parallel to the scanning direction. Based on the coverage loss measurement, a vector analysis system is constructed enabling generation of virtual channel signals which are available for processing in the same way as physical channels, with impedance plane representation including real and/or imaginary signal components. The system differentiates between parallel and perpendicular defects and employs different algorithms to generate virtual channel signals for parallel and perpendicular defect orientations.
    Type: Grant
    Filed: January 30, 2017
    Date of Patent: September 15, 2020
    Assignee: OLYMPUS AMERICA INC.
    Inventor: Benoit Lepage
  • Patent number: 10662758
    Abstract: A method includes introducing a pipe inspection tool into a first pipe positioned within a wellbore and further positioned within at least a second pipe. The pipe inspection tool includes an electromagnetic sensor having a coil antenna that includes a coil winding extending axially along at least a portion of the electromagnetic sensor. An excitation signal is transmitted between a first terminal and a second terminal of the coil antenna. A first response signal is measured between a third terminal and a fourth terminal of the coil antenna, wherein at least one of the third and fourth terminals is different from the first and second terminals. The first response signal is then processed to determine a characteristic of the first pipe.
    Type: Grant
    Filed: September 27, 2018
    Date of Patent: May 26, 2020
    Assignee: Halliburton Energy Services, Inc.
    Inventors: Burkay Donderici, Luis Sanmartin
  • Patent number: 10666927
    Abstract: A method and device for inspection of a rotating asset is disclosed. In one embodiment, the inspection device can include textured pattern projection system for projecting a textured pattern onto an object surface to provide additional surface details to improve stereoscopic image matching. In another embodiment, the inspection device can be configured to save selected images a rotating object when the object is located in a selected or trigger position in different illumination modes. The saved selected images can be transmitted and stored in a cloud-based server and analyzed in an automated fashion.
    Type: Grant
    Filed: March 15, 2017
    Date of Patent: May 26, 2020
    Assignee: Baker Hughes, a GE Company, LLC
    Inventor: Clark Alexander Bendall
  • Patent number: 10649020
    Abstract: A conductor-mounted device (CMD) used to signal an intelligent electronic device (IED) of the existence of a fault on a portion of the electric power delivery system is described herein. The CMD may provide a heartbeat signal to the IED. The CMD may provide a fault signal to the IED. The CMD may be powered via a parasitic current draw on the conductor to which it is mounted. An IED may use a fault signal and/or LOC signal from a CMD to coordinate a high-impedance fault detection and/or downed line events.
    Type: Grant
    Filed: May 9, 2017
    Date of Patent: May 12, 2020
    Assignee: Schweitzer Engineering Laboratories, Inc.
    Inventor: Shankar V. Achanta
  • Patent number: 10629357
    Abstract: Inductive elements comprising anisotropic media and biasing coils for magnetically biasing thereof and methods of manufacture and operation for use in applications such as microelectronics. Application of an electrical current through the bias coils generates a magnetic field that biases the magnetic material such that a desirable orientation of anisotropy is achieved throughout the magnetic core and enables modulation of the inductive response of the device. Electrical conductors coupled to interconnects are magnetically coupled to magnetic core layers to produce self and/or mutual inductors.
    Type: Grant
    Filed: March 5, 2018
    Date of Patent: April 21, 2020
    Assignee: Ferric Inc.
    Inventors: Noah Sturcken, Ryan Davies, Hao Wu
  • Patent number: 10605946
    Abstract: A metal detection apparatus has a passage channel (100) through which products (P) that may contain metal contaminants (C) pass. The apparatus has at least one transmitter unit (1) that provides transmitter signals to a transmitter coil (2) that is inductively coupled to a first and a second receiver coil (31; 32). The receiver coils are balanced and connected separately or combined to an input of a receiver unit (4). The transmitter coil has at least two coil sections (211, 212; 221, 222) that are arranged inclined to one another, with each coil section generating at least a first and a second magnetic field (My; MZ). Each of the first and the second receiver coils has at least a first coil section (311; 321) that is engaged in the first magnetic field and at least a second coil section (312; 322) that is engaged in the second magnetic field.
    Type: Grant
    Filed: May 9, 2017
    Date of Patent: March 31, 2020
    Assignee: Mettler-Toledo Safeline Ltd.
    Inventor: Yifei Zhao
  • Patent number: 10577922
    Abstract: Interrogation tools and methods are used to efficiently locate cable behind casing. The interrogation tool has at least one electromagnetic transmitter and receiver. An electromagnetic field is emitted from inside the tubular, whereby it interacts with the tubular and cable to produce a secondary electromagnetic field. The secondary electromagnetic field is measured by the receiver(s) from at least two different positions inside the tubular to produce corresponding response signals. The interrogation tool then compares the response signals to baseline response signals, whereby the position of the cable is determined. The electromagnetic measurements can be acquired simultaneously or sequentially.
    Type: Grant
    Filed: September 27, 2016
    Date of Patent: March 3, 2020
    Assignee: Halliburton Energy Services, Inc.
    Inventors: Luis San Martin, Burkay Donderici, Aixa Maria River-Rios
  • Patent number: 10538695
    Abstract: Electrically conductive proppants and methods for detecting, locating, and characterizing same are provided. The electrically conductive proppant can include a substantially uniform coating of an electrically conductive material having a thickness of at least 500 nm. The method can include injecting a hydraulic fluid into a wellbore extending into a subterranean formation at a rate and pressure sufficient to open a fracture therein, injecting into the fracture a fluid containing the electrically conductive proppant, electrically energizing the earth at or near the fracture, and measuring three dimensional (x, y, and z) components of electric and magnetic field responses at a surface of the earth or in an adjacent wellbore.
    Type: Grant
    Filed: January 9, 2015
    Date of Patent: January 21, 2020
    Assignee: CARBO CERAMICS INC.
    Inventors: Chad Cannan, Lewis Bartel, Terrence Palisch, David Aldridge
  • Patent number: 10488472
    Abstract: A method for evaluating a uniformity of a magnetic field generated by a magnetic coil is disclosed. The method may include providing an electrical current to the magnetic coil to generate a magnetic field; scanning and obtaining a set of signals of the magnetic field by moving a measurement probe of a scanning tool point by point within a scanning region of the magnetic field and at a scanning height; performing a spectrum analysis on the set of signals by a spectrum analyzer to extract spectrum information of the magnetic field; transferring the set of signals and the extracted spectrum information to a computer system; selecting signals of the magnetic field with one or more frequencies from the set of signals based on the extracted spectrum information by the computer system; and analyzing the uniformity of the magnetic field by analyzing the selected signals by the computer system.
    Type: Grant
    Filed: June 28, 2017
    Date of Patent: November 26, 2019
    Assignee: SICHUAN ENERGY INTERNET RESEARCH INSTITUTE, TSINGHUA UNIVERSITY
    Inventors: Jun Fan, Siming Pan, Dawei He, Yi Liu, Jingdong Sun
  • Patent number: 10459106
    Abstract: An airborne electromagnetic survey system includes: a transmitter arrangement comprising at least one current source configured to connect with a transmitter coil arrangement, and a switch arrangement between the at least one current source and the transmitter coil arrangement, the switch arrangement configured to (1) connect the at least one current source with the transmitter coil arrangement to build up a connecting secondary electromagnetic field, and (2) disconnect the at least one current source from the transmitter coil arrangement to build up a disconnecting secondary electromagnetic field; and a receiver arrangement comprising at least one receiver coil; wherein the airborne electromagnetic survey system further comprises an additional transmitter coil arrangement and a switch arrangement controller, the switch arrangement controller configured to disconnect the at least one current source from the transmitter coil arrangement and the additional transmitter coil arrangement at substantially a same ti
    Type: Grant
    Filed: December 11, 2018
    Date of Patent: October 29, 2019
    Assignee: Selskabet af 6. April 2010 ApS
    Inventor: Kurt I. Sorenson
  • Patent number: 10416244
    Abstract: A planar sensor array capable of three-dimensional magnetic field sensing is disclosed. The sensor array may be utilized, for example, in connection with security inspections and detection of concealed electronics and contraband. Each sensor pixel may comprise a planar spiral inductor to measure a magnetic field of interest in a first dimension, a first Hall effect sensor to measure the magnetic field of interest in a second dimension, and a second Hall effect sensor to measure the magnetic field of interest in the third dimension.
    Type: Grant
    Filed: September 27, 2017
    Date of Patent: September 17, 2019
    Assignee: Arizona Board of Regents on behalf of Arizona State University
    Inventors: David R. Allee, Gregory P. Spell, Brett Larsen, Anthony M. Wilson, Owen C. Ma
  • Patent number: 10345445
    Abstract: In one form, an acoustic signal is generated for an acoustic transducer, where the acoustic transducer is susceptible to reverberation that defines a close proximity indication zone. The start of a close proximity indication zone window is defined after the generation of the acoustic signal at a first time. During the close proximity indication zone window, a signal is received from the acoustic transducer. When the signal is received, an obstacle is detected in the close proximity indication zone if the magnitude of a first pulse received from the transducer at a second time is less than a first threshold but greater than a second threshold for a debounce time. Additionally, a magnitude of a second pulse received from the transducer outside the close proximity indication zone window at a third time should be less than the second threshold but greater than a third threshold for the debounce time.
    Type: Grant
    Filed: July 18, 2016
    Date of Patent: July 9, 2019
    Assignee: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC
    Inventors: Marek Hustava, Tomas Pikula, Tomas Suchy
  • Patent number: 10324062
    Abstract: System and method for characterizing material condition. The system includes a sensor, impedance instrument and processing unit to collect measurements and assess material properties. A model of the system may be used to enable accurate measurements of multiple material properties. A cylindrical model for an electromagnetic field sensor is disclosed for modeling substantially cylindrically symmetric material systems. Sensor designs and data processing approaches are provided to focus the sensitivity of the sensor to localize material conditions. Improved calibration methods are shown. Sizing algorithms are provided to estimate the size of defects such as cracks and corrosion. Corrective measures are provided where the actual material configuration differs from the data processing assumptions. Methods are provided for use of the system to characterize material condition, and detailed illustration is given for corrosion, stress, weld, heat treat, and mechanical damage assessment.
    Type: Grant
    Filed: October 22, 2014
    Date of Patent: June 18, 2019
    Assignee: JENTEK Sensors, Inc.
    Inventors: Scott A Denenberg, Yanko K Sheiretov, Neil J Goldfine, Don Straney, Leon B Kristal
  • Patent number: 10319386
    Abstract: Transmitting node and receiving node for audio coding and methods therein. The nodes being operable to encode/decode speech and to apply a discontinuous transmission (DTX) scheme comprising transmission/reception of Silence Insertion Descriptor (SID) frames during speech inactivity. The method in the transmitting node comprising determining, from amongst a number N of hangover frames, a set Y of frames being representative of background noise, and further transmitting the N hangover frames, comprising at least said set Y of frames, to the receiving node. The method further comprises transmitting a first SID frame to the receiving node in association with the transmission of the N hangover frames, where the SID frame comprises information indicating the determined set Y of hangover frames to the receiving node. The method enables the receiving node to generate comfort noise based on the hangover frames most adequate for the purpose.
    Type: Grant
    Filed: December 12, 2013
    Date of Patent: June 11, 2019
    Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
    Inventors: Stefan Bruhn, Tomas Jansson Toftgård, Martin Sehlstedt
  • Patent number: 10274718
    Abstract: Internal components of power generation machinery, such as gas turbine engines, are inspected with a spherical, optical-camera inspection system, mounted within a camera housing on a distal end of a compact diameter, single-axis inspection scope. The inspection scope includes nested, non-rotatable telescoping tubes, which define an extension axis. Circumscribing, telescoping tubes have anti-rotation collars, which are in sliding engagement with extension tracks on a circumferential surface of an opposing, nested tube, for ease of extension and retraction of the camera during visual inspections of power generation machinery. The camera is advanced and/or retracted along a scope extension axis by nested, drive tubes, which incorporate at least one external drive screw on a circumscribed drive tube and corresponding female threads formed in a circumscribing drive tube. The spherical camera has a 360-degree field of view, and captures images without rotation about the scope extension axis.
    Type: Grant
    Filed: April 21, 2017
    Date of Patent: April 30, 2019
    Assignee: SIEMENS ENERGY, INC.
    Inventors: David Letter, Isaac Piersall, Clifford Hatcher, Jr.
  • Patent number: 10215877
    Abstract: An airborne electromagnetic survey system includes: a transmitter arrangement comprising at least one current source configured to connect with a transmitter coil arrangement, and a switch arrangement between the at least one current source and the transmitter coil arrangement, the switch arrangement configured to (1) connect the at least one current source with the transmitter coil arrangement to build up a connecting secondary electromagnetic field, and (2) disconnect the at least one current source from the transmitter coil arrangement to build up a disconnecting secondary electromagnetic field; and a receiver arrangement comprising at least one receiver coil; wherein the airborne electromagnetic survey system further comprises an additional transmitter coil arrangement and a switch arrangement controller, the switch arrangement controller configured to disconnect the at least one current source from the transmitter coil arrangement and the additional transmitter coil arrangement at substantially a same ti
    Type: Grant
    Filed: March 16, 2015
    Date of Patent: February 26, 2019
    Assignee: SELSKABET AF 6. APRIL 2010 APS
    Inventor: Kurt I. Sorensen
  • Patent number: 10197396
    Abstract: A method for performing continuous calibration of a magnetometer in a device includes during operation of a device, continually performing magnetometer measurements; continuously determining a state of the device; determining a magnetometer calibration model based on the magnetometer measurements and the state of the device; continually evaluating an accuracy of the magnetometer calibration model based the magnetometer measurements and the state of the device; and updating the magnetometer calibration model based on the evaluation of the accuracy magnetometer calibration model, the magnetometer measurements, and the state of the device.
    Type: Grant
    Filed: January 26, 2017
    Date of Patent: February 5, 2019
    Assignee: Apple Inc.
    Inventors: Adam Howell, Hung A. Pham, Xiaoyuan Tu
  • Patent number: 10181720
    Abstract: A circuit uses a high voltage diode to automatically block high voltage flyback pulses of either polarity from the transmit coil of a pulse induction type metal detector from its sensitive receive circuitry. The circuit being fully automatic requires no control signals and permits the receive circuitry to sample the signal being received immediately following the termination of the flyback pulse.
    Type: Grant
    Filed: July 3, 2017
    Date of Patent: January 15, 2019
    Inventor: David Lawrence Emery
  • Patent number: 10101301
    Abstract: A rotating magnetic field probe includes three (or more) windings that work in both transmit and receive mode, to form an eddy current detection transceiver. In a transmit mode, the windings are driven with a drive signal (e.g., an alternating current) having similar or the same magnitude at each winding, but differing in phase from one another. In a receive mode, the terminal voltages of the windings is measured and summed to determine the location of a defect.
    Type: Grant
    Filed: March 21, 2016
    Date of Patent: October 16, 2018
    Assignee: BOARD OF TRUSTEES OF MICHIGAN STATE UNIVERSITY
    Inventors: Chaofeng Ye, Satish S. Udpa, Lalita Udpa
  • Patent number: 9986936
    Abstract: A coil device is provided having a member adapted to extend around and conform to an outer surface of a subject and a conductor adapted to extend only once around a first portion of the subject. The coil device can be positioned about the subject in order to measure a volume of the subject. When placed about the subject in the presence of a relatively homogeneous magnetic field, the conductor can generate a signal indicative of a volume of the first portion of the subject. The coil device may also include two or more conductors separately generating signals indicating volumes of two or more corresponding portions of the subject. In some cases the coil device includes associated authorization data that can limit use of the coil device. Systems and methods incorporating the coil device are also provided.
    Type: Grant
    Filed: December 7, 2012
    Date of Patent: June 5, 2018
    Assignee: VOLUSENSE AS
    Inventor: Morten Eriksen
  • Patent number: 9810805
    Abstract: Various embodiments include apparatus and methods to detect and locate conductive bodies and/or provide steam-assisted gravity drainage (SAGD) steering operation. Tools can be configured with receiving sensors (310) arranged to cancel substantially a primary signal associated with a probe signal without rotating the receiving sensors to cancel the primary signal and to capture a secondary signal generated from a conductive body (301) below the earth's surface. Additional apparatus, systems, and methods are disclosed.
    Type: Grant
    Filed: August 3, 2011
    Date of Patent: November 7, 2017
    Assignee: Halliburton Energy Services, Inc.
    Inventors: Michael S. Bittar, Jing Li
  • Patent number: 9804285
    Abstract: A balanced coil system (2) of a metal detection system has a transmitter coil (21) connected to a first transmitter unit (1), to provide a transmitter signal (s1) comprising at least first and second operating frequencies (fTX1, fTX2). First and second receiver coils (22, 23), which compensate one another when the system is in balance, provide output signals (s22, s23) to a receiver unit (3). The respective operating frequencies are applied separately together each with a monitoring frequency (fMON) to inputs of first and second modulation units (52, 53), which provide first and a second modulated monitoring signals (sM1, sM2), each comprising a first or second modulated monitoring frequency (fMM1, fMM2) without a carrier. When applied to a summation unit (54), the modulated monitoring signals result in a combined output signal (sM12) that is applied to a monitoring coil (24), inductively coupled with at least one of the receiver coils.
    Type: Grant
    Filed: March 24, 2015
    Date of Patent: October 31, 2017
    Assignee: Mettler-Toledo Safeline Ltd.
    Inventor: Stephen McAdam
  • Patent number: 9763593
    Abstract: A system and method for measuring volumes and areas using electromagnetic induction techniques. A current is generated and fed into one of two coil assemblies to induce voltage into another coil assembly to provide accurate values for volume or area.
    Type: Grant
    Filed: August 5, 2013
    Date of Patent: September 19, 2017
    Assignee: VOLUSENSE AS
    Inventors: Morten Eriksen, Erik Eriksen
  • Patent number: 9753173
    Abstract: A system for generating a buffer zone around a buried asset at an above surface location is provided. The system includes an electromagnetic locator device for generating a plurality of buried asset data points via a plurality of radio frequency antennas. The system also includes a server for generating a plurality of connected line segments that represent a geographical position of the buried asset, wherein the plurality of connected line segments are generated by executing an optimization algorithm based on the plurality of buried asset data points, wherein the optimization algorithm: i) minimizes a total number of line segments, ii) minimizes a distance between a line segment and a corresponding buried asset data point, iii) minimizes instances of line segments that are parallel and iv) minimizes line segments shorter than a predefined threshold, and generates a first data structure that represents a two dimensional area comprising a buffer zone.
    Type: Grant
    Filed: November 29, 2016
    Date of Patent: September 5, 2017
    Inventor: Alan Haddy
  • Patent number: 9709690
    Abstract: Provided is a power receiving device including a power receiving coil which receives power supplied by electromagnetic waves, and a measurement coil which is disposed near the power receiving coil and measures an electromagnetic field.
    Type: Grant
    Filed: January 28, 2013
    Date of Patent: July 18, 2017
    Assignee: SONY CORPORATION
    Inventor: Shigeru Arisawa
  • Patent number: 9638823
    Abstract: A metal sensor includes a primary coil arranged in a first plane, a first compensation coil arranged in a second plane, a second compensation coil arranged in a third plane, and a magnetic field sensor arranged in a fourth plane. The first plane, the second plane, the third plane and the fourth plane are oriented parallel to one another and perpendicular to a common z-direction in each case.
    Type: Grant
    Filed: October 31, 2012
    Date of Patent: May 2, 2017
    Assignee: Robert Bosch GmbH
    Inventors: Andrej Albrecht, Tobias Zibold
  • Patent number: 9594040
    Abstract: A method for analyzing objects depending on their electromagnetic properties. The method including the steps of conveying the objects to be analyzed on a conveyer belt; scanning the electromagnetic properties of the objects and the conveyer belt by an electromagnetic sensor, wherein the electromagnetic properties of the conveyer belt are dependent on metallic contaminants which are stuck in the conveyer belt; generating belt properties data representing the electromagnetic properties of the conveyer belt, and analyzing the objects according to the scanned electromagnetic properties and the belt properties data. This has the benefits that the electromagnetic properties of the conveyer belt are considered when distinguishing between metallic and non-metallic objects which have to be sorted. This way, the objects which got stuck in the conveyer belt over time, may influence a sorting less, which may improve sorting results. Further, an apparatus for executing such a method.
    Type: Grant
    Filed: August 16, 2013
    Date of Patent: March 14, 2017
    Assignee: TOMRA SORTING AS
    Inventors: Dirk Balthasar, Thomas Erdmann, Volker Rehrmann, Stefan Jürgensen, Slah Gharbi
  • Patent number: 9523748
    Abstract: A probe for detecting magnetic particles. In one embodiment, the probe includes: a cylindrical probe core having a first end and a second end, the cylindrical probe core defining two channels for containing coils of wire, one of the channels being adjacent the first end of the cylindrical probe core; two sense coils, one each of the sense coils being located in a respective one of the channels; and two drive coils, one each of the drive coils being co-located with the respective sense coil in a respective one of the channels.
    Type: Grant
    Filed: January 11, 2016
    Date of Patent: December 20, 2016
    Assignee: Endomagnetics Ltd
    Inventors: Simon Richard Hattersley, Peter Georg Laitenberger
  • Patent number: 9448205
    Abstract: A coil arrangement for a magnetic induction impedance measurement apparatus includes an excitation coil configured to generate a magnetic excitation field in an object, a shimming coil configured to generate a shimming field, and a detection coil configured to detect a magnetic response field generated in response to the magnetic excitation field inducing a current in the object. In order to enhance an accuracy of a determination of a parameter of an object, a value of a field strength of a net magnetic excitation field in the detection coil, being the sum of the excitation field and the shimming field, is approximately within a magnitude range of an average value of a field strength of the magnetic response field in the detection coil.
    Type: Grant
    Filed: February 9, 2012
    Date of Patent: September 20, 2016
    Assignee: KONINKLIJKE PHILIPS N.V.
    Inventors: Claudia Hannelore Igney, Francisco Javier Rosell Ferrer, Matthias Hamsch
  • Patent number: 9328607
    Abstract: Explosion-proof magnetic flux leakage inspection apparatus for well tubing includes a hermetically sealed interior chamber with an inner wall assembly that forms and surrounds a central channel in a manner that separates the central channel from the hermetically sealed interior chamber by the inner wall assembly. The central channel has an open top and an open bottom to accommodate passage of the well tubing through the central channel. An electromagnetic coil, magnetic flux leakage detector assembly, and a shallow reading detector assembly are positioned in the hermetically sealed interior chamber around the inner wall assembly.
    Type: Grant
    Filed: June 4, 2015
    Date of Patent: May 3, 2016
    Inventor: William Lauf
  • Patent number: 9304225
    Abstract: The method and sensor unit allow the location and detection of metallic or metal-containing objects and materials. A coil arrangement (1.2) comprises a transmission coil and a reception coil, which are arranged on top of one another, wherein the reception coil generates a reception coil output signal. A closed compensation control regulates the reception coil output signal in the receiving coil for compensating changes which occur in the detection range of the reception coil and influence the reception coil. To this end, compensation currents are fed into the receiving branch of the reception coil and are controlled relative to each other such that the reception coil output signal or average values which are detected from the reception coil output signal after demodulation are continuously regulated relative to each other to zero even in the case of metal influence. As a result, a coil with an unregulated transmission current can be used, in which a zero output signal is continuously generated.
    Type: Grant
    Filed: October 2, 2013
    Date of Patent: April 5, 2016
    Inventor: Gerd Reime
  • Patent number: 9279784
    Abstract: A substantially planar eddy-current sensor having durability enhancing pillars in an active region is provided. The pillars are distributed and sized so as to have limited effect on the sensor's performance. When the sensor is mounted on a component such that the sensor experiences forces on a top and bottom surface, the pillars bear the load reducing the load bore by the active elements (e.g., drive winding, sense elements). A sensor with redundant drive windings and/or redundant sense elements is disclosed. The redundant elements may be connected to separate electronics. Another aspect relates to providing a reference transformer for calibration of a sensor. The secondary windings of the reference transformer are connected in series with the sense elements of the sensor to be calibrated. Transimpedance measurements are made when the drive winding of the reference transformer is excited. The measurements are used to correct transimpedance measurements made when the drive winding of the sensor is excited.
    Type: Grant
    Filed: August 11, 2014
    Date of Patent: March 8, 2016
    Assignee: JENTEK Sensors, Inc.
    Inventors: Neil J. Goldfine, David C. Grundy, Darrell E. Schlicker, Andrew P. Washabaugh
  • Patent number: 9239314
    Abstract: A probe and method for detecting magnetic particles. In one embodiment, the probe includes a probe core having a first end and a second end, the probe core defining two regions for containing coils of wire, one of the regions being adjacent the first end of the cylindrical probe core; two sense coils, one each of the sense coils being located in a respective one of the regions; and two drive coils, one each of the drive coils being located in a respective one of the regions, wherein the regions are separated by a distance equal to or greater than the diameter of one of the coils and a source of a secondary magnetic drive field. In another embodiment, the frequency of the drive signal of the secondary magnetic drive field is less than the frequency of the drive signal of the primary drive coils.
    Type: Grant
    Filed: March 13, 2013
    Date of Patent: January 19, 2016
    Assignee: ENDOMAGNETICS LTD.
    Inventors: Simon Richard Hattersley, Peter Georg Laitenberger, Audrius Brazdeikis
  • Publication number: 20150091556
    Abstract: The present invention provides an apparatus and a method for analyzing materials by using pattern analysis of harmonic peaks. The apparatus for analyzing materials according to the present invention comprises a generating unit generating two or more electromagnetic fields, a detecting unit detecting a magnetization signal generated from a measurement target material as an electromagnetic field is applied to the measurement target material, and an analyzing unit analyzing type of the measurement target material based on a harmonic pattern obtained from the magnetization signal.
    Type: Application
    Filed: January 3, 2014
    Publication date: April 2, 2015
    Applicant: Electronics & Telecommunications Research Institute
    Inventors: Hyo Bong HONG, Jae Ho Lim, Sung Woong Shin
  • Patent number: 8988070
    Abstract: A pulse-induction type metal detector using a transmitter coil energizing pulse that selectively reduces the amplitude of background signals from conductive soils, ores and salt water. The detector can be operated with higher amplification of the received signals than conventional detectors, without driving the input amplifier into saturation. This makes it possible to detect land mines, tramp metal and gold in media whose characteristics make detection with conventional metal detectors difficult.
    Type: Grant
    Filed: January 23, 2012
    Date of Patent: March 24, 2015
    Inventor: Allan Westersten
  • Patent number: 8981018
    Abstract: The condition of internal or hidden material layers or interfaces is monitored and used for control of a process that changes a condition of a material system. The material system has multiple component materials, such as layers or embedded constituents, or can be represented with multiple layers to model spatial distributions in the material properties. The material condition changes as a result of a process performed on the material, such as by cold working, or from functional operation. Sensors placed proximate to the test material surface or embedded between material layers are used to monitor a material property using magnetic, electric, or thermal interrogation fields. The sensor responses are converted into states of the material condition, such as temperature or residual stress, typically with a precomputed database of sensor responses.
    Type: Grant
    Filed: March 14, 2005
    Date of Patent: March 17, 2015
    Assignee: Jentek Sensors, Inc.
    Inventors: Neil J. Goldfine, Vladimir A. Zilberstein, Ian C. Shay, Christopher A. Craven, David C. Grundy, Volker Weiss, Andrew P. Washabaugh
  • Patent number: 8970212
    Abstract: An eddy current probe 1 in accordance with the present invention has a structure in which a cross coil 7 is placed in a predetermined direction relative to permanent magnets 3 and 5 in the following manner. When the probe 1 is erected, the coil 7 is placed between the magnets 3 and 5 so that a direction CD in which the opposing portion 9a (9c) of the first coil 9 is extended intersects with a direction MD in which the magnets 3 and 5 are extended. In the same manner, when the probe 1 is erected, the coil 7 is placed between the magnets 3 and 5 so that a direction CD in which the opposing portion 11a (11c) of the second coil 11 is extended intersects with the direction MD in which the magnets 3 and 5 are extended.
    Type: Grant
    Filed: September 24, 2012
    Date of Patent: March 3, 2015
    Assignee: Mitsubishi Heavy Industries, Ltd.
    Inventor: Masaaki Kurokawa
  • Publication number: 20150035522
    Abstract: A sample holder and a coaxial method of measuring the permeability of magnetoelectric materials as a function of applied DC voltage are described. The sample holder reduces electromagnetic radiation losses as compared to conventional devices. The connections in the sample holder are electrically isolated from measuring equipment, preventing damage. A complementary algorithm to analyze the signal from the sample and calculate the permeability of the sample is described.
    Type: Application
    Filed: March 15, 2013
    Publication date: February 5, 2015
    Applicant: Northeastern University
    Inventors: Khabat Ebnabbasi, Carmine Vittoria
  • Publication number: 20150022193
    Abstract: Methods and apparatus for detecting a magnetic field include a magnetic source configured to provide a magnetic field to induce an eddy current in a non-ferromagnetic target, and a magnetic field sensing element configured to detect the magnetic field as a result of the eddy current. The magnetic field provided by the magnetic source can be a static (i.e. DC) field or a changing (i.e. non-DC) field.
    Type: Application
    Filed: July 19, 2013
    Publication date: January 22, 2015
    Applicant: ALLEGRO MICROSYSTEMS, LLC
    Inventors: Eric Burdette, William P. Taylor