330results about "Magnetic sensor arrays" patented technology

The invention discloses a Hall sensor combination system and method for magnetic imaging stability optimization. The system comprises a three-dimensional orthogonal Hall sensor array; the embedded encoder module is used for converting the analog magnetic field signals acquired by the sensor array into digital encoding signals with timestamps; the control module constructs an electromagnetic feature extraction model and is used for carrying out time-frequency domain conjoint analysis on the digital coding signals to obtain magnetic environment disturbance feature parameters; generating a compensation magnetic field parameter opposite to the magnetic environment disturbance characteristic parameter by adopting a closed-loop feedback mechanism; establishing a real-time data channel with a preset electromagnetic imaging module and a preset magnetic field generation module through a preset communication protocol; and constructing a magnetic environment state space model corresponding to the three-dimensional orthogonal Hall sensor array, and obtaining magnetic field distribution data to dynamically adjust and compensate magnetic field parameters so as to realize active magnetic interference cancellation in a three-dimensional space. Problems in the prior art can be effectively solved, and the precision and stability of magnetic imaging are improved.

The invention discloses a crane steel wire rope flaw detection device and a flaw detection method, and belongs to the technical field of nondestructive flaw detection. The device comprises a magnetic memory flaw detection module and a wheel type rope climbing robot device for driving the magnetic memory flaw detection module to move along a crane steel wire rope, the magnetic memory flaw detection module comprises a hollow flaw detection shell, the flaw detection shell is longitudinally provided with a central through hole for a crane steel wire rope to penetrate through, and a plurality of giant magneto-impedance effect magnetic sensors are evenly arranged in the flaw detection shell in the circumferential direction of the central through hole. Therefore, a sensor array used for detecting the leakage magnetic field intensity of the crane steel wire rope is formed, and the giant magneto-impedance effect magnetic sensors are arranged in a coplanar mode. The device is mainly based on the giant magneto-impedance effect magnetic sensor and the metal magnetic memory principle, extremely weak magnetic nondestructive testing is conducted on the crane steel wire rope, and the device is convenient to use, high in detection precision, simple in structure and suitable for various steel wire rope detection environments.

The invention belongs to the technical field of magnetic particle imaging, particularly relates to a magnetic particle imaging system and method based on a flexible receiving coil array, and aims to solve the problems that an existing rigid receiving coil is poor in biological surface adaptability and low in signal-to-noise ratio for micro geometric texture imaging. According to the structure, a receiving coil array adheres to the surface of an object to be measured, the receiving coil array and a compensation coil array are distributed on the two sides of a flexible substrate, the receiving coil array is used for receiving magnetic nanoparticle signals, and the partitioned small compensation coil array is used for conducting feed-through interference and electromagnetic interference compensation on a receiving coil; the reconstruction method comprises the following steps: sequentially carrying out Fourier transform on the collected receiving signals, extracting in-phase third harmonics and superposing to obtain processed signals, interpolating to construct a sinogram for Cartesian coordinate distribution, and reconstructing the three-dimensional particle concentration distribution of a measured object by a filtering back projection method. A flexible receiving coil array strategy is adopted, an adaptive reconstruction method is provided, and the imaging signal-to-noise ratio is improved.

The invention discloses a temperature drift compensation method for a miniature crystal oscillator chip, and particularly relates to the field of temperature drift compensation for electromagnetic interference signal measurement, which comprises the following steps of: arranging a double-shaft Hall sensor array around a temperature sampling channel of the miniature crystal oscillator chip, and carrying out spatial distribution acquisition on a low-frequency electromagnetic field in a chip operation environment; generating an electromagnetic disturbance signal for representing a parasitic electromagnetic interference behavior; and pilot frequency convolution processing is carried out on the electromagnetic disturbance signal and a thermal response signal obtained in a temperature sampling channel, coupling response characteristics related to an electromagnetic interference behavior are extracted, and a spectrum fitting template of an electromagnetic parasitic injection behavior is constructed. A low-frequency electromagnetic disturbance sensing channel is synchronously introduced outside a temperature sampling path, and an interference identification, stripping and compensation dynamic linkage mechanism is constructed to realize active detection and correction of latent electromagnetic interference components in a temperature response signal, so that the problems of frequency compensation error and long-term offset accumulation in the prior art are solved.

Provided is a magnetic moment measurement system and method, which belong to the technical field of magnetic moment measurement, and solve the problems of insufficient accuracy, low efficiency, and vulnerability to disturbance from an external magnetic field in the existing magnetic moment measurement technique. The magnetic moment measurement method includes the following steps: acquiring a magnetic field vector and a magnetic gradient tensor at a center of a magnetic sensor array through the magnetic sensor array; calculating an angle of a magnetic moment vector; and according to the angle of the magnetic moment vector, selecting a corresponding magnetic moment inversion formula, and calculating the magnetic moment vector. By constructing the magnetic sensor array, and using the advanced inversion algorithm, this application not only significantly improves the magnetic moment measurement accuracy, but also greatly shortens the measurement cycle, simplifies the measurement system, and reduces the measurement error.

The invention provides a method for plasma bombardment energy distribution detection and life prediction of a silicon carbide part, and belongs to the technical field of semiconductor processing based on deep learning. The method comprises the following steps: firstly, arranging a magnetic probe array to obtain local electromagnetic parameters, and obtaining plasma luminescence characteristics by using optical imaging and spectrum acquisition equipment; preprocessing the acquired data to obtain multi-source fusion features; designing an energy distribution reconstruction framework based on a generative adversarial network, wherein a generator is used for deducing a three-dimensional energy distribution field of plasma; and inputting the three-dimensional energy distribution field time sequence characteristics into a bombardment dynamic characteristic modeling time sequence depth network, establishing a nonlinear mapping relation between energy distribution and material aging, further obtaining life prediction parameters, and finally obtaining the remaining service life of the silicon carbide part. According to the method, a complex degradation mechanism can be reflected more accurately, and the precision and robustness of life prediction are remarkably improved.

A system for measuring magnetic fields from a subject's organ comprises a plurality of unshielded magnetometers in a three-dimensional arrangement and an electromagnetic source. The system is configured to simultaneously collect, via each magnetometer of the plurality of magnetometers, (i) a biomagnetic field from at least a portion of the subject's organ, (ii) an electromagnetic signal from the electromagnetic source, and (iii) a background magnetic field. The system is configured to synchronize a plurality of magnetic signals collected by the plurality of magnetometers according to the electromagnetic signal from the electromagnetic source. The system is configured to output a signal indicative of the collected biomagnetic field and the background magnetic field in accordance with the synchronizing. The system is configured to operate without magnetic shielding.

To provide a magnetic sensor device in which influence of stress applied is suppressed.SOLUTION: A magnetic sensor device 1 comprises magnetic sensors 10, 20, 30, and a support medium 4. The center of mass of an element arrangement area of the magnetic sensors 10, 20, 30 is displaced from center of mass C4 of a reference plane 4a of the support medium 4. Each of the magnetic sensors 10, 20, 30 includes four resistance parts composed of a plurality of MR elements. Magnetization of a free layer 54 in two resistance parts contains a component in a third magnetization direction. Magnetization of the free layer 54 in each of the remaining two resistance parts contains a component in a fourth magnetization direction opposite to the third magnetization direction.SELECTED DRAWING: Figure 8

Methods and apparatus for a magnetic field sensor having a first set of MR elements configured to change in resistance due to an applied magnetic field having an orientation in a sensitive axis of the first set of MR elements and a second set of MR elements that are immune to the applied magnetic field. The second set of MR elements is configured to change in resistance due to temperature. A processor can compensate for the response of the first set of MR elements based on the temperature information from the second set of MR elements.

A method for extracting information about one or more magnetic sources includes obtaining a first plurality of signals corresponding to magnetic sensor data generated by one or more magnetometers in an unshielded environment at a first time; receiving second information of a direction and a magnitude of a first known magnetic field applied to the one or more magnetometer, the first plurality of signals is acquired while the first known magnetic field is applied and wherein the first known magnetic field encodes directional information of the one or more magnetic sources into the first plurality of signals; extracting the information comprising three-dimensional spatial information of the one or more magnetic sources, respective orientations and strengths of the one or more magnetic sources based on the first information, the second information, and the plurality of signals corresponding to the magnetic sensor data.

The invention discloses a ferromagnetic material internal defect leakage magnetic field increasing method based on alternating current and direct current composite magnetization, which comprises the following steps of: fixing a workpiece at the center of a composite exciting coil, and synchronously applying direct current and high-frequency alternating current; after pure direct current magnetization is saturated, current is locked, and a basic leakage magnetic field is established; the surface magnetic conductivity is dynamically reduced by overlapping alternating current, and the magnetic shielding effect is weakened; a leakage magnetic field signal is scanned and collected through a differential Hall sensor array, and background magnetic field deduction, peak value comparison and adaptive filtering processing are carried out; and determining an optimal magnetization parameter combination by adopting a gradient descent method and Bayesian optimization. The system is integrated with a composite excitation coil and a signal conditioning unit, so that synchronous excitation, signal acquisition and real-time analysis are realized. The leakage magnetic field signal at the deep defect is enhanced through alternating-current and direct-current composite magnetization, the problem of signal weakening caused by traditional direct-current saturation is solved, the defect detection sensitivity and efficiency are improved, and the method is suitable for non-destructive detection scenes of ferromagnetic materials.

Systems, devices, and methods for localizing magnets are useful for biological tissue analysis and other applications. Tissue analysis systems for use with a tissue analysis device may include a storage medium storing computer readable instructions that cause the execution of magnet localization methods. The system may include the tissue analysis device, which includes a magnet and a magnetometer array disposed adjacent to the magnet. When executed by a processor, the instructions cause operations, including recording a magnetic field of the magnet with the magnetometer array, simulating a simulated magnetic field at each magnetometer of the magnetometer array, and estimating positional information of the magnet based upon iterating simulated positional information of the simulated magnet.

The invention relates to the technical field of power equipment detection, and discloses a power equipment prediction and early warning device, which comprises a data acquisition module, a voltage and current two-port impedance matrix construction module, a voltage and current two-port impedance matrix construction module, a voltage and current two-port impedance matrix construction module and a voltage and current two-port impedance matrix construction module, wherein the data acquisition module is used for acquiring power equipment transformer coil turn voltage and transformer coil temperature; the dual-port network is used for acquiring impedance characteristics of the power equipment and predicting faults of the power equipment according to the impedance characteristics of the power equipment, and the fault analysis module is used for analyzing the faults of the power equipment through a voltage and current two-port impedance matrix, processing the faults of the power equipment according to nodes, carrying out cluster processing on multiple nodes and processing cluster processing conflicts. And the fault analysis module realizes intelligent detection and intelligent fault detection of the transformer of the power equipment, and greatly reduces the complexity of the detection system.

A magnetic sensor element includes a pinned layer, a first non-magnetic layer, a first magnetic layer, and a free layer. The pinned layer has a fixed magnetization direction. The first non-magnetic layer is laminated on the pinned layer. The first magnetic layer holds the first non-magnetic layer with the pinned layer. The free layer is disposed along a lamination direction in which the first non-magnetic layer is laminated on the pinned layer. Each of the first magnetic layer and the free layer has a magnetization direction more easily changed by an external magnetic field than that of the pinned layer. The pinned layer and the first magnetic layer are coupled by indirect exchange interaction.

To provide a magnetic field detection system capable of achieving wide-range magnetic field measurement while reducing the number of magnetic sensors to be used. A magnetic field detection system includes: a shield box having magnetic shields surrounding ameasurement space; a magnetic sensor fixed to the shield box in the measurement space; a sample stage inserted at least at a part thereof into the measurement space; and drive mechanisms for varying the relative positional relationship between the sample stage and shield box. The relative positional relationship between the sample stage and shield box can thus be varied by the drive mechanisms, thus enabling magnetic field measurement over a wide range by using a single or a small number of magnetic sensors.

The invention provides an anti-stray magnetic field rotation angle detection method and system for a three-way sensor, and relates to the technical field of sensor signal processing and motor control, and the method comprises the steps: enabling the three-way sensor to be fixed on a circuit board at an interval of 120 degrees, the sensing axes of the sensors face the rotating part with the permanent magnet together, and the magnetic field direction of the permanent magnet is perpendicular to the sensing axes. The sensor collects three paths of mixed signals containing real angle signals and spurious interference generated when the rotating component rotates, then the signals are subjected to Clark transformation to generate two-phase orthogonal signals, and then anti-interference digital signals are obtained through differential processing and analog-to-digital conversion. Then, a deep learning network based on an attention mechanism is adopted to perform feature enhancement on the signals, and finally, the angle of the rotating part is accurately determined by using an angle calculation algorithm based on the enhanced signals. According to the invention, the accuracy and reliability of angle detection in a strong stray magnetic field interference environment are improved.

A method and device for measuring the magnetic field intensity of a high-temperature superconducting maglev transportation system. The method comprises: determining the upper surface of a permanent magnet track as a magnetic field intensity reference (S1); constructing a chord reference-multi-point chord measurement system to detect irregularities on the upper surface of the permanent magnet track, chord measurement system configurations including a system sampling interval, a system order and a chord measurement configuration (S2); calculating chord measurement values of a plurality of measurement point positions in middle on the basis of the multi-point chord measurement system, and in combination with a least squares method, constructing an inversion model of the measurement system, wherein the inversion model refers to reconstructing an original track irregularity waveform from the chord measurement values of the chord reference, and track irregularities recovered on the basis of the inversion model represent the vertical displacement of the chord reference (S3); on the basis of an optimal chord measurement configuration of the multi-point chord system, determining arrangement positions of gap sensors, and arranging a Hall sensor array in a magnetic field intensity measurement direction (S4); and correcting a reference position on the basis of the vertical displacement of the chord reference, and on the basis of Hall sensor measurement results, using an interpolation method to calculate a magnetic field intensity distribution at any height above the reference (S5). The present invention proposes for the first time to combine a multi-point chord measurement principle to measure magnetic field intensity distribution irregularities of the permanent magnet track in high-temperature superconducting maglev transportation, and the measurement results can be used for evaluating magnetic field intensity irregularities of the permanent magnet track of a high-temperature superconducting maglev transportation system and adjusting the attitude of the permanent magnet track.

In described examples, an integrated circuit (IC) written on a substrate that includes a substrate surface includes a magnetic concentrator, a Hall sensor, a primary coil, and a secondary coil. The Hall sensor at least partially overlaps the magnetic concentrator. The primary coil at least partially overlaps the magnetic concentrator. The secondary coil at least partially overlaps the magnetic concentrator and the primary coil, and surrounds the Hall sensor.

The invention belongs to the technical field of battery detection, and particularly relates to a battery module internal short circuit detection method and system based on magnetic field detection. Comprising the steps of constructing a three-dimensional magnetic field sensing array; screening an effective observation window based on quasi-static logic, and triggering a magnetic sensor in the effective observation window to carry out magnetic induction intensity data acquisition; decoupling of background magnetic field and topology current-carrying contribution magnetism is carried out on the original magnetic induction intensity data, and residual magnetic field features are obtained; inputting the residual magnetic field features into the constructed physical constraint neural network model, and inverting the reconstructed current density based on physical driving; and dividing the battery states into different safety levels by adopting a multi-level fault response strategy based on the reconstruction current density, and completing the internal short circuit detection of the battery module. According to the invention, short circuit detection in the battery module is realized based on magnetic field three-dimensional array perception in combination with a physical constraint deep learning model, and an optional implementation path is provided for early accurate diagnosis of short circuit faults in the battery module.

The present disclosure relates to a method (100) of magnetically calibrating a magnetometer sensing system (30) with respect to an electronic device (50), the method (100) comprising: detecting (110) a disturbing magnetic source (520) in the electronic device (50) relative to a reference coordinate system (X, Y, Z) of the magnetometer sensing system (30); identifying (120) one or more magnetometers (Sk,l) of the magnetometer sensing system (30) which are magnetically affected by the detected disturbing magnetic source (520); selecting (130) one or more balancing magnetic sources (400) to reduce a magnetic effect of the detected disturbing magnetic source (520) on the one or more identified magnetometers (Sk,l); and placing (140) the one or more selected balancing magnetic sources (400) in a fixed relation to the magnetometer sensing system (30) and / or to the disturbing magnetic source (520).

The present disclosure can include an ultrasonic generating unit, a transfer unit coupled to the ultrasonic generating unit to move the ultrasonic generating unit in a preset pattern, a sensor that senses a magnetic force generated when the ultrasonic generating unit moves, and a control unit that determines the position of the ultrasonic generating unit based on the magnetic force sensing result information by the sensor, and determines that the ultrasonic generating unit is in any one of a state of being separated from the transfer unit, a state of being detached, or a stopped state when the position of the ultrasonic generating unit is not changed during driving of the transfer unit.

In an embodiment, a method includes wirelessly transmitting power using a transmitter LC tank of a wireless power transmitter, wirelessly receiving power from the transmitter LC tank using a receiver LC tank of a wireless power receiver, interrupting wirelessly transmitting power for a slot period, during the slot period, measuring a receiver signal associated with the receiver LC tank, transmitting receiver data based on the measured receiver signal to the wireless power transmitter, determining a power loss associated with the wirelessly transmitting power based on the measured receiver signal and detecting a metallic object based on the determined power loss.

A system, comprising: a sensing element including a plurality of resistive elements; a switching matrix that is configured to change a total resistance of the sensing element by bringing online or offline one or more of the plurality of resistive elements, the total resistance of the sensing element, at any point in time, being based on respective resistances of only those of the plurality of resistive elements that are currently online; a matrix controller that is configured to detect when a value of a counter signal is updated and cause the switching matrix to change the total resistance of the sensing element by bringing offline or online one or more of the plurality of resistive elements based on the value of the counter signal; and a counter signal generator configured to detect whether an offset signal satisfies a predetermined condition and update the value of the counter signal.

An autonomous driving control system (102) for a vehicle (101) that travels on a road provided with a marker (105) that emits a steady magnetic field or a quasi-steady magnetic field includes: a magnetic sensor array (104) that is equipped on the vehicle (101) and senses magnetism; and an information processing circuit (103) that generates an image showing a magnetic field in a region closer to the marker (105) than the magnetic sensor array (104), according to a sensing result of the magnetism and a fundamental equation of the steady magnetic field and the quasi-steady magnetic field, and controls travel of the vehicle (101) according to the image.

A magnetic sensor is provided for determining the three components X, Y, and Z of an incident magnetic field in a three-dimensional Cartesian coordinate system. The magnetic sensor comprises a pair of first magnetoelectric conversion elements located in the first and third quadrants, and a pair of second magnetoelectric conversion elements located in the second and fourth quadrants, wherein the pair of first magnetoelectric conversion elements have a magnetosensitive axis along a first axis obtained by rotating the X or Y axis by 45 degrees, and the pair of first magnetoelectric conversion elements are arranged so that the positive directions of their magnetosensitive axes are opposite to each other, and at least one of the pair of first magnetoelectric conversion elements has an electrode pair arranged along the first axis, and the pair of second magnetoelectric conversion elements have a magnetosensitive axis along a second axis perpendicular to the first axis, and the pair of second magnetoelectric conversion elements are arranged so that the positive directions of their magnetosensitive axes are opposite to each other, and in the XY plane, the area of ​​the virtual rectangle formed by connecting the adjacent points of the pair of first magnetoelectric conversion elements and the pair of second magnetoelectric conversion elements is smaller than the area of ​​the magnetoelectric conversion elements.

To provide a magnetic sensor applied to a magnetic field detection device that can accurately detect a magnetic field in a predetermined direction while being compact.SOLUTION: A magnetic sensor comprises a stacked structure in which a first layer including a magnetic yoke, and a second layer including a magnetic field detection element and a plurality of magnetic field generators each applying a magnetic field to the magnetic field detection element and arranged discretely along a first axis direction, are stacked in order in a second axis direction intersecting the first axis direction. The magnetic field detection element is interposed between two magnetic field generators selected from the plurality of magnetic field generators in the first axis direction. The magnetic yoke extends in the first axis direction, and is adjacent to the magnetic field detection element in a third axis direction intersecting both the first axis direction and the second axis direction in a plan view. Magnetization directions of the plurality of magnetic field generators are each inclined at less than 45° with respect to the first axis direction.SELECTED DRAWING: Figure 1B

A method for separating spacecraft generated magnetic noise from geomagnetic field data, comprising: detecting magnetic information and outputting a representative detection signal, the magnetic information comprising magnetic noise and geomagnetic field data; receiving the representative detection signal including the magnetic information and resolving the magnetic noise data and the geomagnetic field data; and outputting a resultant signal representative of at least a geomagnetic field data signal.

Various embodiments disclosed herein comprise systems and methods to conform magnetic field sensors to a target geometry. In some examples, an apparatus is configured to conform to a target geometry. The apparatus comprises a sensor mount and a sensor array. The sensor mount comprises a flexible state for a first environmental condition and a rigid state for a second environmental condition. The sensor mount transitions from the flexible state to the rigid state when the first environmental condition transitions to the second environmental condition. The sensor mount transitions from the rigid state to the flexible state when the second environmental condition transitions to the first environmental condition. The sensor array is coupled to the sensor mount.

A system, comprising: a sensing element including a plurality of resistive elements; a switching matrix that is configured to change a total resistance of the sensing element by bringing online or offline one or more of the plurality of resistive elements, the total resistance of the sensing element, at any point in time, being based on respective resistances of only those of the plurality of resistive elements that are currently online; a matrix controller that is configured to detect when a value of a counter signal is updated and cause the switching matrix to change the total resistance of the sensing element by bringing offline or online one or more of the plurality of resistive elements based on the value of the counter signal; and a counter signal generator configured to detect whether an offset signal satisfies a predetermined condition and update the value of the counter signal.