307 results about "Magnetoresistive sensor" patented technology

The invention provides an electrical equipment remote maintenance guidance method and system. The method comprises the following steps: capturing an aperiodic torque waveform and a magnetic field gradient abnormal signal by deploying a torque fluctuation sensor and a magnetoresistive sensor; performing multi-scale frequency band division on the non-periodic torque waveform, screening out a transient high-frequency component in a start-stop stage of equipment, and separating out a magnetic field polarity reversal characteristic from a magnetic field gradient abnormal signal; performing cross-domain matching on the occurrence time of the transient high-frequency component and the spatial orientation of the magnetic field polarity reversal feature to generate a mixed feature mark; calculating a frequency band overlapping degree based on the time-frequency energy distribution marked by the mixed features and generating a coherence map; and matching a fault historical case library according to the coherence map, and outputting a maintenance strategy set aiming at the rotating shaft dynamic unbalance and electromagnetic interference superposition fault. According to the invention, through fusion of torque fluctuation and magnetic field distortion collaborative analysis, the precision of mechanical and electromagnetic composite fault diagnosis of the rotating shaft is improved.

The invention discloses a high-sensitivity detection method for the safety of a battery cell, and the method comprises the following steps: S1, collecting the data of the battery cell in real time through a tunnel magnetoresistive sensor, and outputting a preliminary detection data set; s2, generating a micro-short circuit risk identification signal based on the preliminary detection data set; s3, generating a temperature anomaly distribution map by using the preliminary detection data set; s4, generating a thermal runaway early warning signal based on the temperature anomaly distribution map; s5, performing magnetic field scanning on the pole piece to generate a magnetic distortion data atlas; s6, constructing battery cell multi-source detection data, inputting the data into the physical information neural network, and training to obtain a final battery cell aging evolution model; s7, outputting a charging and discharging strategy optimization instruction based on the final cell aging evolution model; and S8, uniformly fusing the micro short circuit risk identification signal, the thermal runaway early warning signal and the charging and discharging strategy optimization instruction to generate a comprehensive response control instruction. According to the method, magnetic resistance sensing and physical modeling are fused, and intelligent prediction and response control optimization of the risk of the battery cell are realized.

The invention relates to the technical field of magnetic suspension conveying, in particular to an AI-based intelligent multi-rotor magnetic suspension conveying system which comprises an assembly rail base, six linear guide rails, two annular guide rails and a rotor trolley. Damping rings are embedded in the side walls of the two annular guide rails and the six linear guide rails at equal intervals; two opposite L-shaped supports are fixedly installed on the two sides of the bottom of the mover trolley, and adjustable guide magnets are movably installed on the side walls of the L-shaped supports. Through the action of the damping ring and the adjustable guide magnet, transverse vibration of the rotor trolley in the moving process can be remarkably restrained, and then the stability and the operation efficiency of the system are improved; the magnetoresistive sensor receives a magnetic field signal sent by the magnetic field sensor, the magnetic field signal is converted into position information through a decoding algorithm of the AI controller, the position and state information of each mover trolley is accurately detected, collaborative operation of the multiple mover trolleys is achieved, and it is ensured that the mover trolleys efficiently and stably operate according to a preset path and sequence.

The invention discloses a molded case circuit breaker short-circuit fault positioning method, and the method comprises the steps: obtaining the current differential response data of all branches of a molded case circuit breaker control loop when a short-circuit fault occurs based on a magnetoresistive sensor, obtaining a first data set, analyzing the first data set, and extracting the wavefront features of each branch; wavefront arrival time is obtained based on wavefront features, the first data set is input into a wave velocity calibration model to obtain frequency-dependent wave velocities of all branches, and the wavefront arrival time and the frequency-dependent wave velocities are input into a short-circuit fault positioning model to obtain space coordinates of fault points; and carrying out confidence evaluation on the fault point space coordinates to obtain an evaluation result, and judging whether to send the fault point space coordinates to a terminal user based on the evaluation result. The current differential response data is obtained based on the magnetoresistive sensor, the wavefront features are extracted, the frequency-varying wave velocity calibration and path compensation optimization model is combined, the problems of insufficient signal capture, wave velocity modeling deviation and low time difference detection precision in a traditional method are solved, and the short-circuit fault positioning method has the advantage of improving the short-circuit fault positioning precision and reliability.

The invention provides a fault positioning method and system for an overhead line of a power distribution network, and a storage medium. The method comprises the steps of obtaining a plurality of fault traveling wave magnetic field signals; performing the following steps on any signal: performing phase-mode transformation on the signal, extracting and decomposing a line mode component, determining a modulus maximum point, and determining the time corresponding to the point as a first fault traveling wave head arrival moment; carrying out clock synchronization on the moment, and obtaining a wave head arrival moment of a second fault traveling wave; obtaining a to-be-detected fault point and a line parameter; based on the wave head arrival moments of the plurality of second fault traveling waves, extracting a head end arrival moment and a tail end arrival moment; and performing fault positioning on the overhead line of the power distribution network based on the head end arrival time, the tail end arrival time and the fault line parameters. According to the fault positioning method for the overhead line of the power distribution network, interference to normal operation of the power distribution network can be avoided, and high-precision non-intrusive positioning of the overhead line of the power distribution network is realized through the tunneling magnetoresistive sensor.

The invention provides a self-calibration method of a TMR (Tunnel Magnetoresistive) sensor and a TMR sensor array for current measurement, and relates to the technical field of quantum current sensors. According to the method, a double Wheatstone bridge structure is adopted, a to-be-measured bridge is used for measuring a to-be-measured magnetic field, and a reference bridge is used for measuring a known reference magnetic field; the self-calibration of the TMR sensor is realized by calculating the ratio of the output voltages of the two bridges, so that measurement errors caused by environmental factors such as temperature, humidity and mechanical vibration are eliminated; moreover, the invention provides a TMR sensor array for current measurement, the application of the TMR sensor array further enhances the adaptive capacity of the TMR sensor array in a complex environment, and the array is formed by a plurality of TMR sensor units, so that not only can the spatial resolution of measurement be improved, but also the fault-tolerant capability of the system can be improved through redundancy configuration, and the system reliability is improved. The array structure enables the TMR sensor to perform accurate measurement at a plurality of measurement points at the same time to obtain accurate measurement current.

The invention relates to a current measurement method and device, computer equipment, a storage medium and a program product. The method comprises the following steps: acquiring the magnetic field intensity of the two sides of a monitoring point at the current moment through a first magnetoresistive sensor and a second magnetoresistive sensor which are deployed on the two sides of the same monitoring point of a power transmission line to obtain first magnetic induction intensity and second magnetic induction intensity; wherein the first magnetoresistive sensor and the second magnetoresistive sensor are located in the same electromagnetic environment; according to the first magnetic induction intensity, the second magnetic induction intensity and the error coefficient of the first magnetoresistive sensor and the second magnetoresistive sensor, the initial current value of the monitoring point at the current moment is determined, and the influence of the hysteresis effect on the current value is eliminated; and Kalman filtering processing is carried out on the initial current value of the monitoring point at the current moment to obtain the target current value of the monitoring point at the current moment, so that the accuracy of the measured current value is further improved.

The invention provides a magnetic encoder. The magnetic encoder comprises a magnetic code disc and an in-plane orientation magnetoresistive sensor, two in-plane orthogonal magnetic fields generated by the magnetic code disc can saturate the magnetoresistive sensor, and the distance between the sensing center of the magnetoresistive sensor on the opposite plane and the midline of the corresponding magnetic track on the magnetic code disc is not smaller than one fourth of the width of the magnetic track. Wherein the opposite plane is parallel to the magnetic code disc; the sensing center of the magnetoresistive sensor module is the center of a sensing area formed by the plurality of magnetoresistive sensors; the center line of the magnetic track is a line formed by the center points of the magnetic track in the width direction. The precision of the magnetic encoder can be improved.

The invention relates to a gamma sector distinguishing method for a near-bit, and relates to the technical field of oil-gas exploration and development. According to the method provided by the embodiment of the invention, the angular difference problem of the near-bit instrument is automatically processed through the processing of the initial angular difference, the free configuration of the angular difference is realized, and if the mounting position is changed, the trouble in the dismounting process can be reduced. And the difference value between the gravity tool face and the magnetic tool face is collected through an external pump stopping signal to serve as the calibration offset. Meanwhile, the theory that the components of the magnetoresistive sensor in the positive and negative directions of the standard magnetic field are opposite numbers is used, and a certain magnetoresistive component is linear accumulation of all axial components in the standard magnetic field. And respectively corresponding component coefficients can be calculated through composite operation between standard positions. The calibration precision is improved, errors caused by component differences or component installation errors in the installation and debugging process are reduced, the influence on the magnetic tool face is reduced, and the linearity and precision of the tool face are improved.

The invention discloses a pipeline detection probe which comprises a supporting pipe, a metal sleeve, a TMR magnetoresistive sensor, a coil assembly, a signal processing circuit board and a pouring sealant. The open end of the metal sleeve is in butt joint with the supporting pipe. The TMR magnetoresistive sensor and the signal processing circuit board are arranged in the metal sleeve in the axial direction of the metal sleeve, and the coil assemblies are symmetrically distributed on the two opposite sides of the TMR magnetoresistive sensor. The pouring sealant is filled in the metal sleeve, and the TMR magnetoresistive sensor, the coil assembly and the signal processing circuit board are positioned and sealed in the metal sleeve; a wire of the signal processing circuit board is externally connected through the supporting pipe. The metal sleeve is used as an end shell of the probe, so that the anti-collision and anti-pollution capabilities of the probe are improved; the TMR magnetoresistive sensor with the TMR arranged in the annular shape is matched with the coil assemblies symmetrically distributed on the two sides, the sensitivity of the sensor in the low-frequency band is improved, the loss of eddy current in the metal sleeve is reduced, and the problem of signal attenuation caused by the metal sleeve is solved.

A signal processing circuit for a tunneling magnetoresistance sensor comprises thirty-eight MOS transistors, two capacitors and ten switches. A first switch, a second switch, a third switch, a fourth switch, a first MOS transistor, a second MOS transistor, a third MOS transistor and a fourth MOS transistor form a high-frequency modulation circuit. A fifth switch, a sixth switch, a seventh switch, an eighth switch, a seventeenth transistor, a twenty-second MOS transistor and a twenty-third MOS transistor form a high-frequency demodulation circuit. A signal output by a tunneling magnetoresistance sensor is modulated to a chopping frequency by the high-frequency modulation circuit, and is then demodulated by the high-frequency demodulation circuit.

The invention relates to a tunnel magnetoresistive sensor temperature compensation method and device based on an alternating reference magnetic field, computer equipment, a storage medium and a computer program product. The method comprises the following steps: acquiring surrounding magnetic field information, an alternating current signal amplification coefficient, a reference alternating current, an alternating coil parameter and a current temperature error voltage of the tunnel magnetoresistive sensor; separating to-be-measured magnetic field information and reference magnetic field information from the surrounding magnetic field information according to the reference alternating current and the alternating coil parameters; and according to the reference magnetic field information, the to-be-measured magnetic field information, the AC signal amplification coefficient and the current temperature error voltage, adjusting the reference sensitivity of the tunnel magnetoresistive sensor to obtain temperature compensation information. By adopting the method, the sensitivity loss of the tunnel magnetoresistive sensor can be reduced.

A point-of-care device and method for simultaneously and quantitatively assessing a magnetically-labelled analyte immobilised on a lateral flow test strip are provided. The method comprises the steps of sensing a magnetic signal from the magnetically-labelled analyte on the test strip and converting the magnetic signal into an electric signal; processing the electric signal to obtain a quantitative value of the amount of analyte; and processing the values to provide a differential assessment between the magnetically-labelled analyte. The device includes a magnetic reader with at least one magnetic sensor, such as a giant magnetoresistive sensor. The magnetic sensor can be directly or indirectly coupled to a lock-in amplifier configured to perform phase-sensitive detection and enhance the signal-to-noise ratio of weak magnetic signals. A system, microfluidics device, lateral flow immunoassay test strip and kit are also provided.

The invention discloses an AMR magnetoresistive sensor, and mainly solves the technical problem that the detection precision of an existing AMR sensor is easily affected by an external interference magnetic field. Each bridge arm of the Wheatstone bridge is correspondingly connected with a magnetoresistive element in series, and the angle difference of the magnetization directions of the magnetoresistive elements at the adjacent bridge arms is within the range of 180 + / -delta degrees. According to the AMR sensor, the anti-ferromagnetic layer is arranged, and the shape of the anti-ferromagnetic layer is the same as that of the magnetoresistive effect layer, so that compared with an existing AMR sensor, a tedious and complicated exposure process can be omitted, and the purpose of simplifying the process is achieved. And the magnetization directions of the magnetoresistive elements at the adjacent bridge arms in the sensor bridge circuit are basically opposite, so that adverse effects caused by an interference magnetic field can be counteracted when the external interference magnetic field exists, the sensitivity of the sensor is prevented from being greatly changed, and the magnetic field measurement accuracy of the sensor is ensured.

The invention provides an absolute position magnetic encoder, which comprises a double-track vernier code disc, the double-track vernier code disc comprises an inner track code disc and an outer track code disc which are concentrically arranged, the inner track code disc comprises n pairs of magnetic poles which are annularly arranged, the outer track code disc comprises m pairs of magnetic poles which are annularly arranged, m-n = 1, n is a positive integer, n is a positive integer, n is a positive integer, n is a positive integer, and n is a positive integer. The first tunneling magnetoresistive sensor corresponds to the inner rail coded disc, so that the first tunneling magnetoresistive sensor obtains the magnetic field change of the inner rail coded disc; and the second tunneling magnetoresistive sensor corresponds to the outer rail coded disc, so that the second tunneling magnetoresistive sensor obtains the magnetic field change of the outer rail coded disc. According to the absolute position magnetic encoder provided by the invention, the absolute position of the tunneling magnetoresistive sensor on the double-track vernier code disc can be determined by using the magnetic pole phase difference between the inner track code disc and the outer track code disc.

The invention discloses a low-noise, high-precision and low-power-consumption tunnel magnetoresistance array type magnetic anomaly detection device, and relates to the field of geomagnetic field magnetic anomaly detection. In order to overcome the defects that in the prior art, the detection precision is insufficient, the noise level is high, power consumption is large, and long-time stable operation is difficult to consider, the technical scheme provided by the invention is that a signal acquisition and amplification circuit is composed of a plurality of triaxial tunnel magnetoresistive sensors, an isolation circuit, an instrument amplification circuit and a passive filter circuit; the master control and signal processing circuit is composed of a high-precision analog-to-digital conversion circuit, a clock circuit and a microprocessor circuit. The signal transmission circuit is composed of an Ethernet module and is used for transmitting the processed data to an upper computer; the power supply module is composed of a low-noise low-dropout voltage stabilizing circuit and a reference voltage circuit, and is used for providing a stable power supply and a unified reference voltage. The method is suitable for long-time high-precision geomagnetic anomaly detection work in geophysical exploration, national defense safety monitoring and complex environments.

The invention discloses a current sensor structure based on tunnel junction magnetoresistance and a manufacturing method, the current sensor structure comprises a first array group and a second array group, and the first array group and the second array group are composed of a first tunnel junction magnetoresistance array unit and a second tunnel junction magnetoresistance array unit which are arranged along the same sensing direction, and a first electrode unit and a second electrode unit; the sensitive axis directions of the first array group and the second array group are opposite to each other, and the second array group rotates by 180 degrees relative to the first array group in the physical space and then is in cross connection through metal electrodes. The tunnel junction magnetoresistive sensor has the beneficial effects that the tunnel junction magnetoresistive sensor comprises the first array group and the second array group, and the first tunnel junction magnetoresistive array unit and the second tunnel junction magnetoresistive array unit in the first array group and the second array group respectively comprise eight arrays, so that the tunnel junction magnetoresistive sensor has higher physical reliability and stability; the measurement error of the tunnel junction magnetoresistive sensor caused by the magnetic field gradient can be reduced; when the magnetic field and the current are measured, the magnetic field with the magnitude as low as 17 nT / Hz can be measured.

The invention discloses a full-stroke linear absolute position detection method, and belongs to the technical field of position detection. The invention aims to solve the problems of complex circuit structure and low detection precision of the existing full-travel rotor cable-free absolute position detection method. Comprising the steps that a permanent magnet array is installed on a rotor, an anisotropic magnetoresistive sensor array is correspondingly arranged on a stator, and the length of the anisotropic magnetoresistive sensor array is the position detection total stroke; the polar distance between adjacent permanent magnets is the same as the distance between adjacent sensors; determining a main sensor in a middle position in a coupling state according to the current sensor coupling number and the permanent magnet pole number, and calculating the current absolute position initial value of the rotor according to the angle reading of the main sensor; and position compensation is carried out on the current absolute position initial value of the rotor according to the pole number of the permanent magnets, the total number of the sensors and the relative position relation between the main sensor and the permanent magnet array, and the final detection position of the rotor is obtained. The method is used for absolute position detection.

The invention provides a chest drainage amount data display method and device, electronic equipment and a storage medium, and the method is characterized in that magnetoresistive sensor groups are arranged on two opposite sides outside a drainage bottle, a height data group of a magnetic floating ball is obtained through the magnetoresistive sensor groups, and an inclination angle is calculated; the chest drainage data at each moment is directly calculated according to the height data set at each moment and is displayed at the first frequency, the display accuracy and timeliness of the chest drainage data can be ensured, when the inclination angle is larger than the preset angle, the height data sets at n continuous moments are firstly taken, then m target height data sets are selected, and the target height data sets are displayed at the same time. The chest drainage volume data is calculated on the basis and displayed at the second frequency, calculation errors caused by the fact that single-point value taking is affected by shaking can be solved, display jumping caused by frequent change of the drainage volume data can be relieved, and display of the chest drainage volume data is more accurate through integration of the two.

The invention provides a Hall circuit and a Hall chip, which are applied to the technical field of electromagnetic signals. According to the invention, the switch module can be in a continuous opening state, so that the magnetic induction intensity of a surrounding magnetic field can be detected and the working state of the linear Hall sensor can be controlled in real time; as the switch module only needs to realize the functions of detecting the magnetic induction intensity of the surrounding magnetic field in real time and starting the linear Hall sensor switch, the resistance value of the magnetoresistive sensor of the switch module can be set to be large, and the purpose of reducing the quiescent current and power consumption of the Hall circuit can be achieved; secondly, the linear Hall sensor can be used for carrying out high-precision detection on the key stroke of the magnetic axis keyboard, so that the resistance value of a Hall element of the linear Hall sensor can be set to be small, and the detection precision of the linear Hall sensor meets the requirement; moreover, seamless linkage between the press stroke of the key and the brightness of the load LED lamp can be realized by using the load driving module, so that the user experience is enhanced, and software intervention is not needed.

The invention provides a tunnel magnetoresistive sensor based on a Wheatstone full-bridge structure and a manufacturing method thereof, and the tunnel magnetoresistive sensor comprises two tunnel magnetoresistive unit structures which comprise heavy metal layers; two magnetic tunnel junctions are deposited on the heavy metal layer; the antiferromagnetic layer is deposited on the surface of the reference layer of the magnetic tunnel junction so as to fix the pinning direction of the magnetic tunnel junction; the pinning directions of the four magnetic tunnel junctions in the two tunnel magnetic resistance unit structures are the same, the four magnetic tunnel junctions are connected according to a Wheatstone full-bridge structure, currents in different directions are introduced into the heavy metal layer, the magnetization directions of the free layers in the magnetic tunnel junctions are biased through the spin-orbit moment effect, and the magnetic resistance of the magnetic tunnel junctions is improved. The magnetization directions of the free layers in two adjacent magnetic tunnel junctions are symmetrical about the X axis in the XY plane. The magnetoresistive sensor is high in sensitivity and wide in linear interval, the spin orbit moment is used instead of the process bias magnetization direction, the machining process is simplified, errors generated by different processes are eliminated, and the accuracy of magnetic field measurement is improved.

The invention discloses a motion intention pre-judgment method for a dynamic fuzzy trajectory, and relates to the technical field of automatic driving, and the method comprises sensor data collection, multi-source data fusion and motion intention decision-making, and specifically comprises the steps: building a physical field induction network, integrating a magnetoresistive sensor array and an acoustic resonance sensor through a composite sensor unit, and obtaining a motion intention pre-judgment result; carrying out low-delay acquisition and transmission on a physical field signal by combining spectrum modulation of a vehicle-end composite antenna; according to the invention, low-delay data acquisition is realized through a composite sensor and a collaborative acquisition network, the data processing efficiency is improved by combining a distributed database and a three-layer reasoning network, parameters are optimized by utilizing edge-cloud collaborative feedback and a hybrid algorithm, and the problems of high delay, poor adaptability and the like in the traditional technology are solved. The detection precision is improved, millisecond-level response is inquired, the pre-judgment accuracy is improved, and the automatic driving safety is remarkably enhanced.

The invention provides a field calibration method based on a wireless clamp buckle type three-phase electric energy calibration device. The field calibration method comprises the following steps: establishing a wireless communication link between a three-phase electric energy meter and a portable calibration host through a wireless synchronous trigger module; three groups of split-core type current transformers are respectively connected with a detected three-phase line in a clamping manner, a Hall effect sensor and a dual-mode sampling unit of a magnetoresistive sensor are arranged in each group of split-core type current transformers, and current signal fusion processing is realized through a Kalman filtering algorithm; synchronously acquiring the three-phase voltage signals; and generating a three-dimensional verification report comprising the time mark information, the harmonic distribution diagram and the error trend curve, wherein the three-dimensional verification report is packaged by adopting an extensible markup language format and is embedded with a digital signature. According to the invention, power-off-free online verification can be realized, the current measurement precision and the communication reliability are remarkably improved, the anti-interference capability is enhanced, the complex electric energy quality analysis requirement of a new energy access scene is met, and an efficient and reliable technical means is provided for electric energy metering verification of an electric power system.

The invention provides a defect detection system for a ferromagnetic metal device, which is characterized in that a magnetic flux leakage detection excitation coil winds around a C-shaped magnetic core to apply a first magnetic field to a to-be-detected ferromagnetic metal device, and an eddy current detection excitation coil applies a second magnetic field to the to-be-detected ferromagnetic metal device, the tunneling effect magnetoresistive sensor array collects a first magnetic signal under the action of a first magnetic field and collects a second magnetic signal under the action of a second magnetic field; each signal processing circuit receives a first magnetic signal and a second magnetic signal from the connected tunneling effect magnetoresistive sensor; and the FPGA main control module is used for respectively determining a magnetic flux leakage detection result and an eddy current detection result based on the first magnetic signals and the second magnetic signals received by all the signal processing circuits. According to the technical scheme, eddy current detection and magnetic flux leakage detection methods are combined, the high-sensitivity TMR sensor array and the efficient FPGA data processing system are adopted, and the detection capacity of the buried defects in the ferromagnetic metal material is improved.

The invention provides an implantable medical device and a positioning method of a wireless energy transmission coil thereof, and the method comprises the steps: re-exciting a magnetic field through a transmitting coil in a process that the spatial position of the transmitting coil is adjusted; acquiring an induced electrical signal at the receiving coil corresponding to the process of re-exciting the magnetic field; and extracting slope characteristics from the acquired induction electric signals, and judging whether the receiving coil is aligned with the transmitting coil or not according to the slope characteristics. Sensors (such as a magnetoresistive sensor and an electronic compass) hardware do not need to be additionally arranged, the size of the implantation end is small, trauma to a patient in the implantation process is reduced, the coil alignment state is judged by extracting slope characteristics instead of judging the coil alignment state based on signal intensity (such as an absolute value of induced voltage), and the accuracy of the coil alignment state is improved. The judgment method based on the slope characteristics is higher in accuracy and better in anti-interference performance.

A manufacturing method for a magneto resistive sensor includes a first magnetization step for magnetizing a first area of an antiferromagnetic layer by applying a magnetic field in a first magnetization direction and irradiating the first area with a laser beam, and a second magnetization step for magnetizing a second area of the antiferromagnetic layer, the second area not overlapping the first area, after the first magnetization step by applying a magnetic field in a second magnetization direction that differs from the first magnetization direction and irradiating the second area with the laser beam.

The application provides a full-bridge magnetoresistance sensor and an electronic device. The circuit structure of the full-bridge magnetoresistance sensor is a full-bridge circuit structure, and the long axis directions of each sensing unit on adjacent bridge arms in the full-bridge circuit structure are parallel. The sensing unit comprises a flip function layer, a dielectric layer and a magnetoresistance thin film arranged from bottom to top. The flip function layers of the sensing units on two parallel bridge arms are connected to the same current input end, and the flip function layers of the sensing units on the other two parallel bridge arms are connected to the same ground end. By applying a single current to the current input end, the current flowing through the flip function layers of the adjacent bridge arms is opposite, so that the pinning direction of the anti-ferromagnetic layer of the sensing unit in which the heat generated by the flip function layer and the local magnetic field are reversed is opposite, and then the magnetization direction of the reference layer in the sensing unit on the adjacent bridge arm is opposite, so that a complete full-bridge structure is realized on a single chip, and the effect of flexibly setting or resetting the reference layer direction after production or during use can be achieved.

The invention relates to the technical field of pressing equipment, and particularly discloses a protection device of a cubic press, which comprises a mounting shell mounted on the outer side of the cubic press, and a signal controller, a protection signal harness end and a connection harness group are mounted on one side of the mounting shell. The signal controller is in signal connection with a detection axial calibration assembly, a three-monitoring-point debugging mechanism and a self-locking signal response assembly through the protection signal wire harness end. According to the diameter of a crack generation area, the magnetoresistive sensors are driven by the driving motor to axially debug the positions around the regulation and control support, and the extension lengths of the magnetoresistive sensors are debugged by the extension mechanism according to the central point of the crack generation area as a symmetrical end point, so that the three groups of magnetoresistive sensors can adjust the positions of the magnetoresistive sensors even if the crack is not in a holding-up hammer central plane state. The center point of the crack can be reselected to set equilateral test distances among the three groups of magnetoresistive sensors, so that the stability of the output end of the magnetic field is ensured, and the damage state of the holding-up hammer is accurately confirmed.

The disclosure relates to a sensor device (100) for sensing a current (121) flowing through a busbar (120) in a battery-supplied vehicle, the sensor device (100) comprising: a carrier (110) configured for a placement above or under the busbar (120); and a Tunnel Magneto-Resistance, TMR, sensor (111) arranged on the carrier (110), the TMR sensor (111) being configured to sense a magnetic field (122) generated by the current (121) flowing through the busbar (120) and provide sensor data of the sensed magnetic field (122); wherein the TMR sensor (111) comprises a sensor interface (111a) configured to provide the sensor data to a controller (115) for determining the current (121) flowing through the busbar (120) based on the sensor data of the TMR sensor (111). The sensor device may comprise a second TMR sensor arranged on or above the carrier, the second TMR sensor being configured to sense the magnetic field and provide second sensor data of the sensed magnetic field; wherein the second TMR sensor comprises a sensor interface configured to provide the second sensor data to the controller for determining the current flowing through the busbar based on the second sensor data of the second TMR sensor. By using a second TMR sensor, sensing can be improved as two TMR sensors may cover wider measurement range than a single TMR sensor.

The invention belongs to the technical field of nondestructive testing, and discloses a special-shaped alternating current electromagnetic field detection probe, which comprises a 16-core plug connecting signal amplification circuit module, an excitation module and a tunnel magnetic resistance (TMR) sensor, the signal amplification circuit module is connected with the TMR sensor; the excitation module is connected with the signal amplification circuit module; the excitation module sends an excitation signal to a to-be-tested workpiece, the to-be-tested workpiece provides a feedback signal to the TMR sensor, the TMR sensor sends the feedback signal to the amplification circuit module for amplification, and the amplified feedback signal is transmitted to the computer through the 16-core plug. According to the invention, the sensitivity and precision of electromagnetic field detection are improved, the applicability and flexibility of the probe are enhanced, and the heat insulation medium arranged in the probe shell can effectively protect the working environment of electronic components. According to the invention, powerful technical support is provided for accurate detection in a complex electromagnetic environment.