445results 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.

A sensor assembly is described, the sensor assembly comprising: a measurement bed for receiving an item to be measured; a supporting member vertically displaced from the measurement bed, when in use; a magnetic-field sensor connected to the supporting member; a motor for driving movement between the magnetic-field sensor and the measurement bed; and a controller configured to actuate the motor to cause the magnetic-field sensor to move relative to the measurement bed to scan the magnetic-field sensor across a measurement area. A method of measuring a magnetic field generated by an item using the sensor assembly is also described. The method comprises: positioning the item on the measurement bed such that it is within the measurement area; and scanning the magnetic-field sensor over the measurement area to measure the magnetic field generated by the item. A battery is described. The battery comprises one or more magnetic-field sensors within and / or around a respective magnetic and / or electrochemical component of the battery.

According to the single-fiber coupling type double-beam miniaturized high-sensitivity atom magnetometer device, pumping laser and detection laser are orthogonally coupled into a single polarization maintaining fiber through a polarization beam splitter, and miniaturization of a light source light path is achieved. Besides, the polarization maintaining optical fiber and the polarization beam splitter are adopted to combine and decouple the light beams, so that the problems that the miniaturization difficulty of the magnetometer probe is increased due to light guide of multiple collimating heads and extra noise is introduced by multiple optical fibers are avoided, and high sensitivity is realized in a small detection volume; and a great promotion effect is achieved in related detection application of high-density multi-atom magnetometer array type heart and brain magnetism.

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.

The invention relates to the technical field of weak magnetic detection, and provides a weld defect detection method which comprises the following steps: stacking six weak magnetic sensors in pairs to form an L shape, and positioning a second weak magnetic sensor and a fifth weak magnetic sensor which are stacked into a first group right above a weld, the first weak magnetic sensor and the fourth weak magnetic sensor which are stacked into the second group are located right behind the first group, and the third weak magnetic sensor and the sixth weak magnetic sensor which are stacked into the third group are arranged side by side and aligned at one side of the first group, namely, difference calculation is carried out on two magnetic induction intensity signal values of the same group; setting at least two conditions for judging defects according to the characteristics of the welding seam and a weak magnetic detection principle, substituting the magnetic induction intensity data after the background field is removed into the conditions for judging the defects by utilizing a redundancy detection principle to carry out defect feature recognition, and carrying out defect feature recognition according to a probability statistics principle. And the correct probability of defect judgment is calculated, so that the accuracy of a weld defect judgment result can be 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.

The present disclosure may include an ultrasonic generator; a transfer unit coupled to the ultrasonic generator and configured to move the ultrasonic generator in a preset pattern; a sensor configured to detect a movement of the ultrasonic generator; and a control unit configured to: determine a position of the ultrasonic generator based on detection result information by the sensor, and based on the position of the ultrasonic generator not changing while the transfer unit is being driven, determine that the ultrasonic generator is in one of a state of being separated from the transfer unit, a state of being detached, and a state of being stopped.

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.

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.

A system for detecting a target object including: a first and a second detector which have magnetic sensors configured to detect a magnetic field and to generate a signal which indicates a magnetic field intensity; a processing unit configured to receive the signals which indicate an intensity of a magnetic field detected by the sensors; and a communication interface which is configured to transmit the signals generated by the magnetic sensors to the processing unit, the processing unit additionally being configured to determine a corrected value of the signals generated by the magnetic sensors of the first and second detectors and, when the corrected value is greater than a predetermined threshold value, to send instructions for generating an alarm.

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 100 includes: a shield box 200 having magnetic shields S1 to S3 surrounding a measurement space 230; a magnetic sensor 40 fixed to the shield box 200 in the measurement space 230; a sample stage 300 inserted at least at a part thereof into the measurement space 230; and drive mechanisms 141 to 143 for varying the relative positional relationship between the sample stage 300 and shield box 200. The relative positional relationship between the sample stage 300 and shield box 200 can thus be varied by the drive mechanisms 141 to 143, thus enabling magnetic field measurement over a wide range by using a single or a small number of magnetic sensors 40.

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.

An apparatus for measuring magnetic fields from a subject's organ comprises a plurality of unshielded magnetometers in a three-dimensional arrangement. A respective pair of magnetometers, in the plurality of magnetometers, has a respective known separation. Each magnetometer in the plurality of magnetometers is configured to simultaneously detect a biomagnetic field from at least a portion of the subject's organ and a background magnetic field and output a signal indicative of the detected biomagnetic field and the background magnetic field.

Various embodiments disclosed herein comprise systems and methods to arrange magnetic field sensors. In some examples a magnetic field detection system comprises a sensor holder and magnetometers. The sensor holder mounts the magnetometers proximate to a magnetic field source that generates a magnetic field. The magnetometers measure the magnetic field in multiple directions. A first portion of the magnetometers measures a normal component of the magnetic field and a first tangential component of the magnetic field, and a second portion of the magnetometers measures the normal component of the magnetic field and a second tangential component of the magnetic field. The sensor holder distributes the first portion of the magnetometers and the second portion of the magnetometers, so the tangential components measured by neighboring ones of the magnetometers mounted to the sensor holder are orthogonal.

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.

The invention relates to the field of magnetic field strength detection technology, and in particular to an automatic detection device and method for residual magnetic field strength of concrete materials; the device comprises: a conveying mechanism, a magnetic shielding mechanism, and a magnetizing mechanism; a plurality of magnetic detection devices are evenly distributed in the magnetic shielding cylinder, the magnetic detection device detects the residual magnetic field strength of a concrete material sample, and a magnetizing component magnetizes the concrete material sample; a control system is used to control the magnetic detection device and the magnetizing mechanism, and calculate the data measured by the magnetic detection device to obtain the residual magnetic field strength of the sample before and after magnetization, and judge whether the detection result exceeds the standard, and display the residual magnetic field strength calculation result on a display; the assembly line type and cyclic automatic detection of the residual magnetic field strength of the concrete material is realized, and the problem of large workload and low detection efficiency of manual detection of a large number of concrete materials is solved; the conveying mechanism adopts non-magnetic material to avoid interference of ferromagnetic material on the detection process.

A metal detecting system using search-coil type sensor includes sensor modules that detect respective objects which move around the corresponding sensor modules, each sensor module having one or more sensors that include respective housings having respective inner spaces, respective cores formed to be inserted into the inner spaces of the housings, and respective coils which are each wound around a portion of an outer circumferential surface of each of the housings, the portion corresponding to a position of each of the cores; imaging units that image the respective objects that move around the corresponding sensor modules and image respective persons possessing the respective objects; impedance matching units that are connected to a plurality of the sensor modules, respectively, and perform impedance matching; and amplifiers that are connected to the impedance matching units, respectively, and amplify a fine current and voltage generated during approach of the objects to the sensor modules.

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.