199 results about "Hall effect" patented technology

The invention discloses a three-dimensional magnetic field bionic seal beard sensor based on a Hall effect. The sensor comprises a mounting frame, a Hall chip, a universal joint component, bionic beards and magnets, wherein the Hall chip and the universal joint component are arranged on the mounting frame; the bionic beards are arranged on the universal joint component; the universal joint component is used for enabling the bionic beard to swing in a first direction and a second direction in a reference plane perpendicular to the center line of the bionic beard after the bionic beard is subjected to the acting force of fluid, the first direction is perpendicular to the second direction, and the universal joint component enables the bionic beard to reset after the bionic beard is not subjected to the acting force of the fluid; the magnetic flux density of the magnets changes along with the movement of the bionic beards; the Hall chip is used for sensing magnetic field information. While the characteristics of strong environmental adaptability and high sensitivity of a conventional bionic beard sensor are reserved, the limitation of one-way sensing of the sensor is broken through, the synchronous detection capability of the flow velocity, the flow direction and the vortex street frequency is improved, and the application range of the sensor in a complex underwater scene is widened.

A dendrometer, comprising a single mechanical element functionally holds a sample under test via a spring-element in the element that draws two arms firmly against the sample. The spring section of the single mechanical element can be serpentine, or any other shape providing the desired spring constant and range of motion. The one or more spring members extend between the first frame member and the second frame member, wherein the one or more spring structures are nonrigid (extensible and compressible) such that the second frame member is movable relative to the first frame member. The dendrometer comprises a toothed socket on an end of each arm to allow adjustment of the range of clamping. In at least one example, a magnet or actuator attached to one arm, and a Hall effect or other positional sensor, is attached to the alternate arm.

A system is described that includes a sputter target and a magnetic element array including multiple sets of magnets arranged to have a Hall-Effect region that extends along a length of the sputter target. The elongated sputtering electrode material tube is interposed between the magnetic array and an object to be deposited with a sputtered material from the sputter target. During a direct current high-power impulse magnetron sputtering operation, the system performs a depositing on a surface of the object by generating and controlling an ion and neutral particle flux by: providing a vacuum apparatus containing a sputter target holder electrode; first generating a high-power pulsed plasma magnetron discharge with a high-current negative direct current (DC) pulse to the sputter a target holder electrode; and second generating a configurable positive voltage kick pulse to the sputter target holder electrode after terminating the negative DC pulse.

The invention discloses a Hall device and a manufacturing method thereof. The Hall device comprises a substrate; the active region extends into the substrate from the first surface of the substrate, and the active region has a first conduction type; the functional areas are located on the surface layer of the active area, and the adjacent functional areas are arranged at intervals; a plurality of first isolation structures, wherein one first isolation structure is arranged on the surface layer of the active region between the adjacent functional regions; a plurality of field injection regions, one field injection region is arranged in the active region below each first isolation structure, and the field injection region has a second conduction type; wherein a first distance is formed between the bottom of the functional region and the bottom of the active region, a second distance is formed between the bottom of the field injection region and the bottom of the active region, and the second distance is smaller than the first distance. According to the invention, the effective thickness teff of a carrier circulation region in the active region can be reduced, and the detection sensitivity of the Hall device is improved.

The invention discloses a magnetic electronic device for generating track torque by using a metal vanadium or titanium track Hall effect and a manufacturing method thereof. The device comprises a substrate, a track Hall structure containing a vanadium or titanium layer, and a heavy metal layer and a ferromagnetic layer which are adjacent to the track Hall structure, when a charge current passes through the vanadium or titanium layer, a transverse track current is generated based on the track Hall effect, and the track current is injected into the ferromagnetic layer and then converted into an effective track torque for controlling the magnetization state of the ferromagnetic layer. Preferably, the ferromagnetic layer has a perpendicular magnetic anisotropy. According to the invention, the light transition metal vanadium or titanium is used as the track Hall material, the experiment proves that a huge track Hall angle greater than 0.45 can be obtained, and meanwhile, the resistivity of the material is lower, so that the shunting phenomenon can be reduced in an actual device, and the critical current density for realizing write-in flipping can be obviously reduced. The device is simple in structure and compatible with an existing semiconductor process, and a brand new material platform is provided for developing a low-power-consumption and high-density magnetic random access memory (MRAM).

The embodiment of the invention provides a container transportation state monitoring method based on multi-parameter perception, which is applied to the technical field of logistics monitoring and comprises the following steps: by taking a Hall switch trigger signal as a time reference and a logic starting point, acquiring acceleration, attitude angle, position and temperature and humidity signals in a time window before and after triggering; performing time sequence correlation analysis on the acceleration, the attitude angle and the position signal to generate initial event judgment; when the initial event is determined to be physical door opening or hoisting start, extracting an impact decay time constant and an attitude angle deviation retention amount, and constructing a two-dimensional feature space to perform mechanical impact classification; asynchronously calling a temperature and humidity signal according to a judgment result for root verification; and generating a joint event code and executing differentiated resource control. According to the invention, triggering events with different properties can be accurately distinguished, risk grading of mechanical impact and source tracing of environmental abnormity are realized, terminal endurance time is obviously prolonged, and monitoring reliability is ensured.

This invention belongs to the field of pipe testing and discloses an automatic pipe wall thickness detection device and method. The detection device includes a frame, a clamping and rotating mechanism, a horizontal moving mechanism, a spring clamping mechanism, and a Hall effect measuring mechanism. The clamping and rotating mechanism is mounted on the frame and is used to clamp the pipe to be tested and drive it to rotate circumferentially. The horizontal moving mechanism is movably mounted on the frame along the length of the pipe to be tested and is located below the clamping and rotating mechanism. The spring clamping mechanism is mounted on the horizontal moving mechanism. The Hall effect measuring mechanism includes a steel ball, a measuring rod, and a main unit. The steel ball is placed inside the pipe to be tested. The measuring rod is electrically connected to the main unit and is mounted on the spring clamping mechanism with its head abutting against the bottom of the pipe to be tested, used to measure the distance between the head and the steel ball placed inside the pipe. The main unit is fixedly connected to the horizontal moving mechanism. This invention is particularly effective for non-destructive testing of the wall thickness of sintered plastic pipes containing micropores.

The headphone comprises a head beam, two ends of the head beam are respectively connected with an ear shell, a PCBA circuit board, a loudspeaker and a noise reduction microphone are installed in the ear shells, the PCBA circuit board is electrically connected with the loudspeaker and the noise reduction microphone, the PCBA circuit board is located on the rear side of the loudspeaker, and the loudspeaker is electrically connected with the noise reduction microphone. A Hall switch and a control module are arranged; a lifting air bag is installed in the rear end of the ear shell, the rear end of the lifting air bag is connected with a lifting cover, when the lifting air bag ascends backwards, the lifting cover can be opened backwards from the rear end of the ear shell, and when the lifting air bag descends forwards, the lifting cover can cover the rear end of the ear shell forwards. A permanent magnet is mounted at the joint of the lifting cover and the lifting air bag; and the Hall switch and the permanent magnet are opposite in position and are in magnetic induction fit. According to the invention, the headphone can be switched between the noise reduction mode and the transparent mode by raising or lowering the lifting air bag, so that external personnel can conveniently observe and judge whether the headphone is in the noise reduction mode or the transparent mode.

Disclosed is a Hall-effect propulsion system comprising a Hall-effect thruster (10), a cathode (40), and an electrical power supply (80) including an engine power supply (81) delivering an engine discharge current (Id) to the cathode (40) allowing an engine discharge (DM) to be created in a gas contained in the Hall-effect thruster (10), and a secondary power supply (82) delivering a secondary discharge current (Ik) to the cathode (40). The Hall-effect propulsion system comprises means (90) for controlling the electrical power supply (80), which are configured to command delivery of a secondary discharge current (Ik) by the secondary power supply (82) to the cathode (40) in order to keep the cathode (40) at a minimum operating temperature between two activations of the engine power supply (81).

In one aspect, a Hall effect device includes an implantation layer; an epitaxial layer located above the implantation layer; a trench filled with a dielectric material and extending from a top surface of the epitaxial layer into the implantation layer and defining an enclosed region; a buried layer the epitaxial layer from the implantation layer within the enclosed region; and a contact pad located on the epitaxial layer. The trench reduces a current from the contact pad from traveling in a lateral direction orthogonal to a vertical direction and enables the current to travel in the vertical direction.

A fully integrated micro search coil magnetometer (μSCM) with a low-noise instrumentation amplifier is provided for low-frequency magnetic field measurements in the range of 1Hz to 1kHz. A micro search coil formed by stacking planar spiral inductors and serially connecting them with an in-phase configuration is used for magnetic field measurements. The critical line width and inner diameter of a planar spiral inductor are theoretically calculated and experimentally verified, enabling the development of a unique CMOS layout. This layout incorporates the calculated critical inner diameter, significantly optimizing the area utilization on the CMOS die. Additionally, the CMOS die includes a polysilicon-layer inductor for on-chip calibration, a Hall effect sensor for DC magnetic field measurement, and a temperature sensor for enhanced functionality. The μSCM delivers a compact, energy-efficient, and highly sensitive solution for low-frequency magnetic field measurements, surpassing the performance of most commercially available Hall effect sensors.

The invention discloses a low-power-consumption planar three-dimensional magnetic sensor based on a graphene microcoil / magnetic composite film and a three-dimensional magnetic field measurement method thereof. The sensor is formed by sequentially laminating a substrate, a bottom-layer soft magnetic composite film, an insulating layer, a graphene microcoil, a passivation layer and a top-layer soft magnetic composite film. The sensor utilizes a planar structure to realize three-dimensional magnetic field detection, on one hand, the sensor is based on an inductive giant magneto-impedance mechanism, and high-precision detection of a magnetic field in a plane (X / Y axis) is realized by utilizing the change of inductive reactance between excitation and induction graphene coils along with the magnetic field; on the other hand, by means of the excellent Hall effect of graphene, magnetic field components in the vertical direction (Z axis) can be sensed at the same time. According to the sensor, real-time decoupling of a three-dimensional magnetic field can be realized by using a planar structure through one-time measurement, and angle and space errors introduced in the conventional three-dimensional sensor assembling process are avoided. In addition, due to the collaborative optimization design of the graphene coil and the soft magnetic thin film, power consumption is reduced, and the resolution ratio is improved.

This invention relates to an electric motor and a cleaning device. The electric motor includes a housing assembly, a fixing assembly, a stator assembly, a rotor assembly, a circuit board, and a Hall effect detection assembly. The fixing assembly is at least partially located within a receiving cavity of the housing assembly; the stator assembly is located within the receiving cavity and fitted over the fixing assembly; the rotor assembly is located outside the stator assembly and connected to the housing assembly to rotate synchronously with it; the circuit board is located within the receiving cavity; the Hall effect detection assembly includes a Hall sensor and a magnetic component, the Hall sensor being disposed on a control board, and the magnetic component being disposed on the housing assembly, the magnetic component, the control board, and the stator assembly being arranged side-by-side along the axial direction of the fixing assembly; the fixing assembly includes a coaxially arranged fixing member and a sleeve, the sleeve being located outside the fixing member, the sleeve having a higher machining precision than the fixing member, and the circuit board being fitted snugly over the sleeve. The higher-precision sleeve limits the circuit board, improving the reliability of the circuit board's fixation, thereby improving the accuracy of the Hall sensor detection.

The invention provides a layered Van der Waals material with full-compensation ferrimagnetism and a topological Hall effect as well as a preparation method and application of the layered Van der Waals material. The chemical formula of the material is MnxCrTe2, wherein 0 lt; and x is 1. The material provided by the invention has a wide compensation temperature range, a large magnetoresistance effect, anisotropy and a topological Hall effect, is a CrTe2 intercalation ferromagnetic material doped in different proportions, and can realize optimization and continuous adjustability of performances such as magnetism, Curie temperature and Hall parameters of the material through regulation and control of mechanisms such as the doping proportion, the temperature and the magnetic field; and a material basis is provided for researching the application of the Mn intercalation CrTe2 crystal material in the field of magnetic induced storage.

The utility model discloses an intelligent water cup capable of monitoring water intake, which relates to the technical field of water cups, and comprises a cup body and a cup cover arranged at a cup opening of the cup body, a suction nozzle assembly is arranged in the cup cover, the suction nozzle assembly comprises a protective shell, an interaction control module is arranged on one side of a cavity of the protective shell, and a suction nozzle is arranged on the other side of the cavity of the protective shell. A bottom pipe opening of the suction nozzle is provided with a suction pipe extending into the cup body, and a Hall flowmeter connected with the interaction control module is arranged between the suction nozzle and the suction pipe. According to the design, the suction nozzle assembly is arranged, the Hall flow meter is arranged between the suction nozzle and the suction pipe, the water drinking amount sucked by a user is metered, a metering signal is transmitted to the interaction control module to be monitored and metered, the mode that a water drinking amount metering module is arranged in a traditional water cup is replaced, and the water drinking amount of the user can be accurately and effectively monitored; the misjudgment influence caused by external operation is reduced, and the drinking water metering and monitoring are more accurate.

This utility model discloses a monitoring matrix for monitoring water levels in dams, relating to the field of water level monitoring technology. It includes a dam sidewall with multiple extension plates installed on it. Each extension plate has a sliding groove inside, which communicates with the interior of the dam. A bracket is installed on each of the upper ends of the extension plates, located on either side of the sliding groove. A first fixed shaft is connected between two brackets, and a traction rope is mounted on the surface of the first fixed shaft. One end of the traction rope extends into the sliding groove and is fitted with a float. A longitudinal groove is formed at the upper end of the dam sidewall. This utility model, through a series of structures and the cooperation of multiple Hall effect sensors and floats, overcomes the limitations of traditional single-point monitoring. It achieves full-area coverage of dam water levels using a mechanical transmission matrix. Compared to purely electric monitoring equipment, it has lower maintenance costs and frequency, and the mechanical structure is less susceptible to the effects of extreme environments.

The utility model provides an external battery and electronic equipment for identifying the external battery. The external battery comprises: a magnetic element for generating a magnetic field greater than a preset magnetic field intensity threshold; after the external battery is connected to the electronic equipment, the electronic equipment can identify whether the external battery is provided with a coulombmeter chip or not by detecting whether a magnetic field larger than a preset magnetic field intensity threshold value is generated in the electronic equipment or not. The external battery with the coulombmeter chip is defaulted to comprise the magnetic element, and the external battery without the coulombmeter chip does not comprise the magnetic element; the electronic equipment comprises a Hall device which is used for detecting the magnetic field intensity around the Hall device, generating a Hall output signal when the magnetic field intensity around the Hall device is greater than a preset magnetic field intensity threshold value, and sending the Hall output signal to a CPU (Central Processing Unit); and the CPU is used for judging whether an external battery connected to the electronic equipment is provided with a coulombmeter chip or not by detecting whether the Hall output signal is received or not.

The application discloses an electric read-write memory device based on 180-degree flip of anti-ferromagnetic Neel vector, a preparation method and a read-write method. The electric read-write memory device comprises a substrate layer, an anti-ferromagnetic layer and a spin source layer which are sequentially stacked from bottom to top and constitute a heterostructure. The material of the substrate layer is a single crystal wafer capable of epitaxially growing the anti-ferromagnetic layer. The material of the anti-ferromagnetic layer is a collinear anti-ferromagnetic material with abnormal Hall effect or a staggered magnet with abnormal Hall effect. The material of the spin source layer has a spin current generation capability. The memory utilizes a current pulse to drive 180-degree flip of the Neel vector. The Neel vector before and after the 180-degree flip has two abnormal Hall resistance states of high and low, and can be used for storing information "0" and "1". The application not only enriches the connotation of the interaction between the spin current and the anti-ferromagnetic Neel vector, but also lays a foundation for constructing a high-density, high read-write speed and low-power nonvolatile magnetic random memory.

This utility model discloses a Hall effect adjustable structure and a brushless sensor motor for an RC car model, including an induction plate adjustment seat, a fixed bracket, a cover plate, and a Hall plate assembly. The induction plate adjustment seat includes an adjustment base plate and a fixed cylinder, with the fixed cylinder disposed on the adjustment base plate. The adjustment base plate has several arc-shaped slots. The fixed bracket is disposed on one end face of the adjustment base plate. The cover plate is disposed on the end face of the adjustment base plate away from the fixed bracket, and the cover plate also has scale lines. The adjustment base plate has markings that correspond to the scale lines. The Hall plate assembly includes a large PCB board and a small PCB board, with the small PCB board disposed on the large PCB board. The large PCB board is mounted on the adjustment base plate, and the large PCB board has a central through hole. The fixed cylinder passes through the central through hole and abuts against the small PCB board. This utility model, by also providing scale lines on the cover plate and markings on the adjustment base plate that correspond to the scale lines, can effectively and precisely adjust the angle position of the induction plate adjustment seat.

In embodiments of the present disclosure, logic devices include magnetically coupled and electrically isolated perpendicular magnetic anisotropy (PMA) ferromagnet (FM) material layers. The logic devices may be read based on the anomalous Hall effect (AHE).

The utility model provides a flow sensor. The flow sensor comprises a first fan blade, an inductance coil and a pulse output circuit. Wherein the first fan blade is provided with more than two first blades which are circumferentially arranged at intervals, and the first fan blade rotates under the driving of fluid, so that the first blades and the inductance coil can be dynamically and alternately close to or far away from each other, and the inductance value of the inductance coil is changed. And the pulse output circuit is electrically connected with the inductance coil. Compared with an existing condition that a first pulse signal and a second pulse signal are respectively output when two adjacent first blades sequentially cut a magnetic induction line by utilizing a Hall effect principle, the first pulse signal can be output when the first blades are close to an inductance coil; and when the preset position (such as the middle position of the two adjacent blades) between the two adjacent first blades is close to the inductance coil, the second pulse signal is output, so that the number of pulse signals output in unit time can be multiplied, and the measurement sensitivity is improved.

The invention relates to the field of power monitoring and management, in particular to a power distribution room equipment internet of things monitoring system. The system comprises a distributed sensing node network, an edge computing gateway, a data center platform and a multi-stage early warning module, the distributed sensing node network comprises a temperature and humidity sensor, a Hall effect current sensor and a voltage sampling circuit, and a signal processing unit is arranged in the distributed sensing node network; the edge computing gateway is connected with the distributed sensing nodes through a communication bus; the data center platform constructs a digital twin model of the power distribution equipment, stores time sequence data and configures a waveform analysis engine; the multi-stage early warning module is configured with a three-stage threshold interval, establishes a communication link with the linkage control device, and is configured with an alarm signal conversion unit. According to the invention, the technical effects of effective monitoring of the distribution room, processing of sensing signals, dynamic rendering display, linkage instruction generation, waveform analysis and diagnosis, and the communication bus having a protocol conversion function are achieved.

This application discloses an adaptive control method, apparatus, and Hall device for a Hall effect device. The method includes: acquiring a sinusoidal signal and determining a maximum and minimum value in the sinusoidal signal; when the difference between the maximum and minimum values ​​exceeds a first threshold, determining a first signal value and a second signal value based on the maximum and minimum values; wherein the first signal value is the signal value corresponding to the center position of the sinusoidal signal, and the second signal value is the signal value when the pulse signal corresponding to the sinusoidal signal changes; and performing signal conversion on the sinusoidal signal using the first signal value and the second signal value to obtain a target pulse signal. Applying the technical solution provided in this application achieves simpler and more convenient adaptive control of the Hall effect device, effectively reducing the R&D cost of the Hall effect device while ensuring the accuracy of the output results.

The utility model provides a Hall effect demonstration instrument based on a cathode-ray tube. The Hall effect demonstration instrument comprises a high-voltage power supply module, wherein the high-voltage power supply module generates extra-high voltage to drive the cathode-ray tube on the right side. The experimental phenomenon visualization part comprises a cathode-ray tube, a permanent magnet and a light emitting diode, after the cathode and the anode of the cathode-ray tube are connected with high voltage, cathode ray beams, namely electron beams, are generated, and tracks of the electron beams are displayed through an internally arranged fluorescent screen; the two permanent magnets are respectively positioned on two sides of the cathode ray tube to provide a magnetic field; the light emitting diode is connected with a receiving pole plate in the vertical direction inside the cathode ray tube through a wire, the Hall voltage is visualized into an optical signal, the Hall effect demonstration instrument solves the defect that the Hall effect principle is difficult to visualize in the Hall effect teaching process to a certain extent, and the experiment teaching effect can be improved.

The invention discloses a high-voltage distribution box current detection system and method and a storage medium, and relates to the technical field of vehicle high-voltage system current detection. The system comprises a high-voltage distribution box and a processing assembly, the high-voltage distribution box is arranged to distribute high-voltage electric energy to at least one high-voltage electric appliance assembly in the vehicle, a Hall effect sensing assembly is arranged in the high-voltage distribution box, and the Hall effect sensing assembly is arranged to conduct Hall sensing on a high-voltage discharge loop in the high-voltage distribution box to obtain output voltage; and the processing assembly is connected with the Hall effect sensing assembly and is used for carrying out current conversion on the output voltage to obtain a current detection result. According to the invention, the technical problems of low current detection precision and high cost of the automobile high-voltage distribution box in the prior art are solved.

This utility model belongs to the field of marine technology, specifically relating to a multi-level equalization management system for marine lithium battery packs. It includes a main control chip, a voltage detection circuit, a current detection circuit, a temperature sensor, and an equalization switch array. By employing a voltage detection circuit composed of operational amplifiers and voltage divider resistors, a current detection circuit composed of Hall effect sensors and low-noise amplifiers, temperature sensors arranged at multiple locations within the battery pack, and an equalization switch array composed of transistors, it achieves high-precision acquisition and rapid response control of battery parameters. This solution improves the system's stability and equalization efficiency in complex environments, effectively solving the problems of untimely and inaccurate equalization control caused by insufficient monitoring accuracy and response lag in existing technologies, thereby significantly improving the safety and service life of marine lithium battery packs.

The invention provides a current sensor sensitivity temperature drift correction circuit, a chip and electronic equipment. The circuit comprises a primary side current frame, a Hall device, a control circuit, a conversion circuit, a signal conditioning circuit, a correction circuit and a demodulation amplification circuit. The Hall device outputs two paths of differential Hall voltages; the conversion circuit performs four-phase rotation on the Hall device; the differential Hall voltage is converted into a corresponding differential Hall current; the signal conditioning circuit outputs and amplifies the first differential voltage according to the differential Hall current to obtain a second differential voltage; the correction circuit processes the second differential voltage to obtain an excitation digital signal; comparing the signal with a preset digital reference signal to obtain an error control signal; adjusting the excitation voltage of the Hall device according to the error control signal so as to enable the sensitivity of the current sensor to be a fixed value; and the demodulation amplification circuit demodulates and amplifies the second differential voltage to obtain an output voltage. Therefore, the sensitivity temperature excursion of the current sensor chip is reduced.

The application relates to a two-dimensional ferromagnetic material and a preparation method of a Hall device, and belongs to the technical field of electronic materials. 0.29 TaS2, electrode preparation through ultraviolet lithography and magnetron sputtering, and Hall device preparation through mechanical peeling and transferring. Single-crystal Fe 0.29 The preparation method of the single-crystal Fe TaS2 is not only high in efficiency, but also has less iodine and impurities remaining on the single-crystal surface. The prepared Hall device exhibits good ferromagnetism and air stability. Under the action of an applied magnetic field, a huge topological Hall effect can be observed in the Hall device. Notably, even after relaxation effect measurement, the topological Hall effect still stably exists, showing excellent stability and reliability. The "robust" chiral spin texture brought by the huge topological Hall effect has application value in the fields of magnetic storage and magnetic information transmission.

The invention relates to the technical field of detection, in particular to a fault detection method and device, electronic equipment and a program product. The method is used for detecting a fault of a Hall sensor, the Hall sensor is used for measuring the rotating speed of a vehicle motor, the fault detection method comprises the steps that the rotating speed error of the motor is monitored, the rotating speed error is the error value between the first rotating speed of the motor and the second rotating speed of the motor, and the first rotating speed is determined based on a model of the motor; the second rotating speed is measured based on a Hall sensor; and when a preset condition is satisfied, determining that the Hall sensor has a fault, the preset condition comprising that the rotating speed error is continuously increased and the first rotating speed is greater than a preset first rotating speed threshold. Therefore, the accuracy of sensor fault detection can be improved, and an additional hardware detection circuit is not needed, so that the circuit cost is reduced.

The utility model discloses a non-contact full-automatic carrier Hall mobility test system for a radio frequency HEMT (High Electron Mobility Transistor) structure. The non-contact full-automatic carrier Hall mobility test system comprises an electromagnetic control assembly, a sample stage movement assembly, a microwave assembly, a signal detection assembly, a signal regulation assembly, a circuit control assembly, an industrial personal computer and data analysis software. According to the utility model, the total electromagnet intensity can be + / -1.2 T, the larger the magnetic field intensity is, the stronger the Hall effect is, and the test resolution and accuracy can be effectively improved; the back copper block lifting mechanism adopts a high-precision servo motor, the resolution ratio is higher, and accurate positioning of a measurement signal point can be realized through a software algorithm; according to the utility model, the price is reduced, the period is shortened, the consistency is better, the parameters are adjustable, and further improvement can be realized.