公开(公告)号：US11893885B2

公开(公告)日：2024-02-06

申请号：US17358747

申请日：2021-06-25

申请人： National Central University

发明人： Chien-Chih Chen

IPC分类号： G01R33/04 ,  G01R33/09 ,  G08G1/042 ,  G01R33/022 ,  G01R33/00

CPC分类号： G08G1/042 ,  G01R33/0094 ,  G01R33/022 ,  G01R33/04 ,  G01R33/091

摘要： A method for parking detection and identification of moveable apparatus, comprising following steps of: generating a magnetic field signal containing an unique identifier for identifying the moveable apparatus by a magnetic field generator disposed in the moveable apparatus; measuring magnetic field respectively by two magnetic field sensors of a magnetic field sensing apparatus disposed in a moveable-apparatus parking place or its peripheral area, wherein a first and a second magnetic field measurements are measured; and calculating a magnetic field measurement difference for obtaining the unique identifier, wherein the magnetic field measurement difference is a magnitude of a difference of the first and the second magnetic field measurements, or a magnitude of a difference of a first magnetic field component of the first magnetic field measurement along a characteristic direction and a second magnetic field component of the second magnetic field measurement along the characteristic direction.

公开(公告)号：US20230400534A1

公开(公告)日：2023-12-14

申请号：US18035255

申请日：2021-11-04

申请人： The University of Warwick

发明人： Gavin Morley ,  Rajesh Patel ,  Leiqing Zhou

IPC分类号： G01R33/07 ,  G01R33/04

CPC分类号： G01R33/07 ,  G01R33/04

摘要： Sensor A device is disclosed. The device comprises a magnet (15) arranged to apply an inhomogeneous magnetic field (B) to a given volume (16) and a magnetometer having an active element (8) for sensing magnetic field in a volume which includes the given volume (16).

公开(公告)号：US20230213598A1

公开(公告)日：2023-07-06

申请号：US18000846

申请日：2020-07-15

申请人： NINGBO CRRC TIMES TRANSDUCER TECHNOLOGY CO., LTD.

发明人： Xiaowei HOU ,  Yang LV ,  Liangguang ZHENG ,  Juping LI ,  Po ZHANG ,  Peng WU

IPC分类号： G01R33/00 ,  G01R33/04 ,  G01R33/3873

CPC分类号： G01R33/0052 ,  G01R33/04 ,  G01R33/3873

摘要： A manufacturing method for a fluxgate chip, comprising: firstly, selecting two high-resistance silicon wafers, electroplating a ferromagnetic core on the surface of one of the two high-resistance silicon wafers, and providing a ferromagnetic core cavity on the surface of the other high-resistance silicon wafer; then, bonding the two high-resistance silicon wafers up and down; next, respectively providing coil grooves, through grooves and electrode windows on the surfaces of opposite sides of the two high-resistance silicon wafers to form a silicon wafer mold; and finally, filling the surface of the silicon wafer mold with alloy. By means of electroplating, post-bonding and final etching, on the one hand, the formed fluxgate chip has both small thickness and sufficient strength, on the other hand, large-scale batch production of the fluxgate chip can be achieved, the working efficiency is improved, and the production cost is reduced.

公开(公告)号：US20230084963A1

公开(公告)日：2023-03-16

申请号：US17917480

申请日：2021-04-09

申请人： HATCH LTD.

发明人： Matthew Gorczyca ,  Mark James Mitchell ,  Patrick Henry McGinn ,  Michael Morgan Campbell ,  Matthew Douglas Brown

IPC分类号： G01R31/52 ,  B60M3/00 ,  B61D15/12 ,  B61K9/08 ,  B61L27/53 ,  G01R33/07 ,  G01R31/00 ,  G01R31/11 ,  G01R33/00 ,  G01R33/028 ,  G01R33/04 ,  G01R33/09

摘要： A method, device, and system for detecting a current leak in a traction power rail. Magnetic or electrical properties of the rail are measured. The measurements are performed using a rail instrument that senses the properties around the rail at various times while the instrument is being moved down the rail, such as using a cart or train. The rail instrument may be a flux concentrator or open Rogowski coil. The locations of the rail, about which the readings are taken by the rail instrument, may be determined and correlated with the measurements themselves. The method may comprise measuring the magnetic field of the rail along a length of the rail, and identifying a leak based on differences between the magnetic field measurements. The system may comprise a cart comprising the rail instrument and a location instrument.

公开(公告)号：US11480633B2

公开(公告)日：2022-10-25

申请号：US16493000

申请日：2017-12-27

申请人： Gill Corporate Limited

发明人： Michael John Gill

IPC分类号： G01R33/04 ,  G01C17/38 ,  G01R33/09

摘要： A compass includes a magnetic sensing element in the form of a coil surrounding magnetic material. Electric current is supplied to the coil in opposite directions, depending on the state of switches operated at times T0, for a first direction, and T5, for a reverse current direction. A voltmeter measures voltages across the coil, namely at least V1 at time T1, after T0, and V2 at time T2, after T5, with T1−T0=T2−T5=predetermined ΔT. A processor indicates V1−V2, the magnitude and sign of which indicate the strength and direction of the earth's magnetic field respectively.

公开(公告)号：US11467228B2

公开(公告)日：2022-10-11

申请号：US17095271

申请日：2020-11-11

申请人： Texas Instruments Incorporated

发明人： Argyrios Dellis ,  Juan Alejandro Herbsommer ,  Adam Joseph Fruehling ,  Bichoy Waguih Bahr

IPC分类号： G01R33/02 ,  G01R33/04 ,  G01R15/20 ,  G01R15/18 ,  G01R33/07 ,  G01R33/09

摘要： In described examples, a magnetic sensor includes a waveguide that encapsulates dipolar molecules. A mm-wave electromagnetic field is launched into the waveguide, travels through the dipolar molecules, and is then received after passing through the dipolar molecules. The frequency of the mm-wave electromagnetic signal is swept across a range that includes an intrinsic quantum rotational state transition frequency (Fr) for the dipolar molecules. Absorption peaks in accordance with the Zeeman effect are determined. A strength of a magnetic field affecting the magnetic sensor is proportional to a difference in the frequencies of the absorption peaks.

公开(公告)号：US20220260613A1

公开(公告)日：2022-08-18

申请号：US17630716

申请日：2020-07-20

申请人： LEM INTERNATIONAL SA

发明人： Stephan Trombert

IPC分类号： G01R15/18 ,  G01R33/04

摘要： Fluxgate current transducer including a fluxgate device comprising a saturable soft magnetic core and an excitation coil, and a processing circuit comprising a control circuit and a voltage generator connected to the control circuit for generating an alternating current in the excitation coil, the voltage generator generating a voltage oscillating between a maximum positive voltage (+Umax) and a maximum negative voltage (−Umax) configured to alternatingly saturate the soft magnetic core. The control circuit is configured to generate a voltage having an absolute value of amplitude less than an absolute value of said maximum positive voltage (+Umax) and said maximum negative voltage (−Umax) voltage during a variable time window (Tn, Tn+1, Tn+2, Tn+3) after detection of the excitation coil current reaching a threshold current (S3) representative of saturation of the magnetic core during at least a subset of a plurality of alternating voltage periods (P).

公开(公告)号：US11269021B2

公开(公告)日：2022-03-08

申请号：US16910935

申请日：2020-06-24

申请人： Baker Hughes Oilfield Operations LLC

发明人： James David Ratcliffe ,  Andrew Smith ,  Jim Andrew Gulliver ,  Sushant Dutta

IPC分类号： G01R33/04 ,  G01R33/00 ,  G01R33/038 ,  G01R33/07 ,  E21B47/092 ,  G01R33/035

摘要： A system for determining a stuck point of a pipe positioned within a wellbore includes a tubular housing and a sensor array positioned within the tubular housing. The system also includes ferromagnetic flux collectors and flux concentrators on either side of the sensor array. The flux collectors collect a magnetic flux that has been written to a portion of pipe. The flux concentrators intensify the flux to improve measurements of the flux that are acquired by the sensor array.

公开(公告)号：US20210319693A1

公开(公告)日：2021-10-14

申请号：US17358747

申请日：2021-06-25

申请人： National Central University

发明人： Chien-Chih CHEN

IPC分类号： G08G1/042 ,  G01R33/022 ,  G01R33/04 ,  G01R33/00 ,  G01R33/09

摘要： Various aspects of methods, systems, and use cases include a robotic system and control or use of the robotic system. A method for autonomous movement of the robotic system may include receiving a target location, identifying robotic components of the robotic system that are in contact with a surface, and determining a robotic component of the robotic components to activate to cause the robotic system to move closer to the target location. The method may include activating, based on the determination, a motor of the robotic component to push against the surface to cause the robotic system to move towards the target location.

公开(公告)号：US20210239773A1

公开(公告)日：2021-08-05

申请号：US17050755

申请日：2019-04-25

申请人： Intelligent Wellhead Systems Inc.

发明人： Murad Mohammad ,  Sheldon Kryger

IPC分类号： G01R33/04 ,  G01R33/00 ,  G01K13/10

摘要： The present disclosure relates to a magnetic sensor that comprises a magnetic-sensing element and a magnetic-affecting element. The magnetic sensor is configured for detecting one or more properties, and/or changes therein, of a target magnetic-field. Further embodiments of the present disclosure relate to a sensor unit that houses and protects the magnetic sensor described herein. Further embodiments of the present disclosure relate to a system that comprises the magnetic sensor alone or the sensor unit described herein. Further embodiments of the present disclosure relate to a method for detecting changes in a target magnetic-field. The magnetic sensor described herein comprises a magnetic-sensing element and a magnetic-affecting element. The magnetic-affecting element attracts or attracts and focuses the target magnetic-field through the magnetic-sensing element.