219 results about "High magnetic field" patented technology

The invention discloses a sensor array multi-objective optimization method for magnetic field signal denoising, and the method comprises the implementation steps: building a magnetic field interference model in a constraint mode, carrying out the transient analysis, and obtaining the time sequence data of magnetic field signals collected by all sensors; setting an optimization index, taking the optimization index as a multi-target fitness function, optimizing the multi-target fitness function, and obtaining an optimal auxiliary sensor layout scheme under the condition that the fitness function value is maximum; establishing a main sensor and an optimal auxiliary sensor array based on the optimal auxiliary sensor layout scheme; and in an interference source influence environment, processing a noise signal of the optimal auxiliary sensor array based on the trained deep learning network model to obtain a denoised magnetic field signal of the main sensor, reconstructing a main position noise through sensor layout optimization and auxiliary sensor array noise, and obtaining an optimal auxiliary sensor array. Magnetic field signal denoising under the condition that an object is disturbed is realized, and the precision of magnetic field testing is improved.

The invention provides a power communication network risk identification method and system and a storage medium. The method comprises the following steps: acquiring electromagnetic interference environment parameters, acquiring optical cable laying path and tower structure data, and analyzing a distribution rule of grounding points of an electromagnetic shielding layer; the influence of electromagnetic interference on signals is eliminated according to a grounding point distribution rule; acquiring optical cable strain information, and extracting optical cable strain change characteristics; determining an optical cable fault and a fault point initial position; correcting the position of a fault point; evaluating the damage degree caused by the magnetic field; and generating a fault point repair suggestion, updating the optical cable state database, and generating an optical cable health state report focusing high magnetic field influence. By implementing the method, the optical cable fault can be effectively positioned, the damage degree of the optical cable can be accurately evaluated, and the stability of a power communication network can be improved.

The invention provides an electro-permanent magnet uncoiling composite magnetic field multi-mode adjustment system which comprises a data acquisition and preprocessing module, a graph structure construction module, a dynamic prediction module, a historical matching prediction module, a magnetic force adjustment strategy module and an electro-permanent magnet execution mechanism. The data acquisition module constructs a multi-modal data cube through a temperature field, deformation, stress and magnesium powder concentration sensing network; the graph structure module discretizes the steel strip coil into a node network and calculates a mechanical association edge weight; the dynamic prediction module updates node features through the graph neural network and then outputs a sliding probability vector through the LSTM network; the historical matching module screens similar working conditions based on a dynamic time warping algorithm and generates magnetic force preset parameters; the strategy model fuses the probability vector and a preset parameter to generate a partition magnetic matrix; and the execution mechanism realizes millisecond-level magnetic field regulation and control through the reconfigurable magnetic pole array. According to the system, the magnetic field control precision can be improved, the interlayer sliding risk is reduced, and the self-adaptive adjustment effect is achieved.

The invention discloses a water-cooling pulsed high-intensity magnetic field coil, and belongs to the technical field of pulsed high-intensity magnetic fields. The coil adopts a laminated structure, each laminated sheet is provided with an opening and a boss, and a spiral structure is formed through electrical connection of the bosses. Each lamination is divided into a through-flow part, a water cooling part and a fixed part; the through-flow part is made of red copper, the water cooling part and the fixing part are made of stainless steel, and an integrated copper-steel composite structure is formed through welding. The water-cooling part is provided with water-cooling grooves welded and sealed by a cover plate; and the water-cooling grooves of the laminations are connected in series through water inlet and outlet holes to form a cooling flow channel. The fixing part is provided with a semicircular fixing hole used for limiting and flow guiding. And an insulating sheet is arranged between the adjacent laminations. The coil is pressed tightly through the upper and lower pressing plates and an insulated fixing stud. Through lamination partitioning and copper-steel compounding, the high-strength and efficient water-cooling capacity is achieved, and the problems of insufficient strength and cooling of the pulse high-intensity magnetic field coil under repetition frequency work are effectively solved.

The invention relates to the technical field of superconducting material processing, in particular to a preparation method of an Nb3Sn superconducting wire. The method mainly comprises the steps that Nb-Zr alloy is loaded into the exterior and / or the center of a Sn-Cu single-core rod, oxide powder is filled between the Nb-Zr alloy and the Sn-Cu single-core rod, then the Sn-Cu single-core rod and the Nb-Zr alloy are loaded into a copper substrate, and Nb3Sn subcomponents are obtained after multi-pass stretching, forming and fixed-length cutting; and uniformly arranging the Nb3Sn sub-components in the copper pipe along the circumferential direction to form a bundle, and after multi-pass stretching, carrying out heat treatment and cutting to obtain the Nb3Sn superconducting wire. By introducing the artificial point pinning array in density gradient distribution, the critical current density of the Nb3Sn superconducting wire in a high magnetic field of 8T-16T is enhanced, the problems that an existing uniform artificial point pinning center scheme generates a matching effect and limits the actual application of the superconducting wire are solved, and the decline degree of the critical current density of the Nb3Sn superconducting wire in the high field is relieved.

The invention relates to the technical field of industrial detection, in particular to an electromagnetic ultrasonic double-wave transducer for detecting residual stress of a pipeline. The problems that in the prior art, single-wave detection errors are large, the fitting degree of a sensor and a pipeline curved surface is poor, and impact force affects an internal structure are solved. The invention provides an electromagnetic ultrasonic double-wave transducer. The electromagnetic ultrasonic double-wave transducer comprises a shell, a magnet assembly, a coil and other components. The magnet assembly is composed of a transversely-arranged first magnet, a longitudinally-symmetrical second magnet and a longitudinally-symmetrical third magnet, the included angle between the magnets is adjusted through a hinge, and vertical and horizontal magnetic fields are formed to excite transverse waves and longitudinal waves at the same time. The lower portion of the shell is arc-shaped and attached to the curved surface of the pipeline, and an elastic supporting structure and a flexible buffering layer are arranged at the joint to buffer impact force. In addition, a grounding lead is arranged to improve the signal-to-noise ratio. Through multi-magnet combination, the arc-shaped shell and the grounding wire buffer design, the magnetic field uniformity and the detection signal strength are effectively improved, and transverse and longitudinal wave integrated high-precision residual stress detection is realized.

The utility model discloses a protection box for high magnetic field chip test, which is used for installing a chip test carrier plate and comprises a shielding box body and an end cover, an accommodating cavity is arranged in the shielding box body, at least one end of the accommodating cavity is open, and the end cover is detachably and fixedly connected to one side of the opening of the accommodating cavity. The end cover is provided with a through groove corresponding to an opening of the containing cavity, the wall of the containing groove is provided with a clamping groove, the groove wall of the through groove is provided with a slot corresponding to the clamping groove, one end, provided with an electronic component, of the chip testing carrier plate penetrates through the slot and then is inserted into the clamping groove, and one end, provided with a chip to be tested, of the chip testing carrier plate is located outside the shielding box body. According to the protection box for the high-magnetic-field chip test, the magnetic shielding effect on the electronic components can be realized only by inserting the electronic components on the chip test carrier plate into the clamping grooves of the shielding box body in a matched manner, the operation is simple, the installation is convenient, and the test efficiency is greatly improved.

An electromagnetic shielding and heat-conducting multi-layer material and a preparation method thereof. The multi-layer material includes an electric field shielding layer, an epoxy heat-conducting adhesive layer, and a magnetic field shielding layer. The electric field shielding layer includes a copper foil layer with a thickness of 5-12 μm. The magnetic field shielding layer has a thickness of 1-3 mm and includes a resin matrix A and carbon fiber cloth. By weight, the resin matrix A includes: 100 parts of bismaleimide resin, 60-68 parts of 3,3-diallylbisphenol A, 32-40 parts of triallyl isocyanurate, 18-20 parts of N,N-dimethylformamide, 100-160 parts of magnetic field shielding filler, 8-10 parts of di-sec-octyl phthalate, and 0.3-0.8 parts of cobalt naphthenate. The magnetic field shielding filler is compounded by nano-manganese zinc ferrite and micron nickel powder in a mass ratio of (80-120):(30-40). The electromagnetic shielding and heat-conducting multi-layer material of the present invention has both electric field and magnetic field shielding functions and is particularly suitable for high magnetic field and high electric field application environments.

The invention provides an error correction method suitable for a three-component magnetic sensor, and the method comprises the steps: building a comprehensive error model of a non-orthogonal error, a sensitivity error and a zero offset error, and solving an error parameter through an intelligent optimization strategy fusing a particle swarm optimization algorithm and a firefly algorithm, thereby achieving the error correction of the three-component magnetic sensor. The method specifically comprises the steps of using a magnetometer to synchronously measure a geomagnetic field module value as a reference standard, combining collected three-component magnetic field data to construct a fitness function, searching an optimal error parameter set by using a particle swarm optimization and firefly fusion algorithm, and compensating the magnetic field data; according to the method, an intelligent optimization strategy based on particle swarm optimization and firefly algorithm fusion is adopted, the magnetic field measurement precision can be effectively improved, and high-precision solving of error parameters and accurate compensation of magnetic field data are achieved.

A magnetic field measurement method based on multi-focus array laser pumping atomic spinning comprises the steps that pumping light is subjected to phase modulation through a spatial light modulator to generate a multi-focus circularly polarized light array, light intensity distribution of focuses of the multi-focus circularly polarized light array on a transverse plane is uniform, and the distances between the focuses of the multi-focus circularly polarized light array are consistent; therefore, the problem of non-uniform distribution of the laser in the transverse direction due to Gaussian light intensity is effectively compensated. In the longitudinal direction, according to the law of energy attenuation caused by the action of light and atoms, the focus light intensity is designed to be gradually enhanced along with the z-axis depth in combination with an anti-Lambert-W function, and a focus array is uniformly focused at the center of an alkali metal gas chamber by expanding the focus depth, so that the transverse and longitudinal polarizability uniformity of alkali metal atoms is remarkably improved, the optical frequency shift virtual magnetic field gradient is inhibited, and the stability of the alkali metal gas chamber is improved. And the common-mode rejection ratio, the signal-to-noise ratio and the response sensitivity of the SERF magnetic field measuring device are improved. The focus array is optimized in real time through detection feedback, efficient compensation and regulation are achieved, and the method is suitable for accurate measurement of the sub-fT-level weak magnetic field.

A mounting opening is arranged on a mounting flange, a mounting step extending along the inner edge of the mounting opening is formed on one side of the mounting opening, a transition ring extends along the inner edge of the mounting step, and quartz glass is positioned on the mounting step and is fixedly welded with the mounting flange through the transition ring. And the quartz glass is welded and fixed at the mounting step of the mounting flange through the transition ring, so that vacuum sealing is realized, sealing materials with poor irradiance such as rubber are effectively replaced, and the device is suitable for ultrahigh vacuum, strong magnetic and irradiation environments such as accelerators, strong magnetic fields, magnetic confinement fusion and the like.

The invention discloses an insert magnetic field automatic debugging system and a debugging method thereof. The system comprises a guide rail two-dimensional adjusting structure used for adjusting the straightness of a guide rail structure, and a Z-direction moving motor reducer structure provides power for a moving trolley structure so that the moving trolley structure can move and be positioned on the guide rail structure; the X-direction piezoelectric ceramic and the Y-direction piezoelectric ceramic drive the debugging head motor reducer structure and the debugging head structure to perform X-direction and Y-direction movement and accurate positioning, so that meshing and separation of the debugging head structure and an insertion piece magnetic array magnetic field debugging bolt are realized; the debugging head motor reducer structure drives the insertion piece magnetic array magnetic field debugging bolt to rotate through the debugging head structure to complete magnetic field debugging; the corrugated pipe flange structure and the magnetofluid sealing transmission structure are communicated with the inside and outside of the vacuum barrel of the vacuum inner insert to realize straightness adjustment and power transmission of the guide rail structure; when the system is used for debugging, the speed is high, the precision is high, the magnetic field quality is good, in-situ debugging of the vacuum inner insert can be achieved, the efficiency is high, and the equipment risk is low.

According to the vector vortex beam generation method applied to the SERF magnetic field measurement device, a vector vortex beam is generated according to a light field distribution formula of the vortex beam in combination with a computer-generated holography method and a polarization mode decomposition method, then iterative optimization is carried out on parameters such as the phase, the amplitude and the polarization direction in the beam in a global NSGA-II algorithm and local SPGD algorithm combination mode, and finally the vector vortex beam is generated. And then judging whether the electron steady-state polarizability uniformity meets the expectation or not, if so, ending the optimization, taking the optimized light beam as a pumping light beam to pump alkali metal atoms, and carrying out subsequent magnetic field measurement, and if not, changing parameters and continuing optimization until the electron steady-state polarizability uniformity meets the expectation. Compared with a traditional Gaussian beam, the atomic polarizability in the air chamber is stabilized at a required value, the atomic spin gradient field of the device is effectively inhibited, the differential performance of the device is enhanced, and the sensitivity of the SERF magnetic field measurement device is improved.

The invention discloses a magneto-rheological damping spring vibration isolator, which relates to the technical field of dampers and comprises an upper shell and a lower shell, vibration isolation springs are distributed between the upper shell and the lower shell, an oil cylinder is arranged in the center of the lower shell, a cavity is formed in the oil cylinder, a piston is arranged in the cavity, a gap is reserved between the oil cylinder and the piston, and the magneto-rheological damping spring vibration isolator further comprises an auxiliary opening. An auxiliary opening is formed in the piston, an iron core is fixedly arranged in the auxiliary opening, the magnet exciting coil is arranged on the outer side of the iron core, the outer portion of the magnet exciting coil is connected with a control circuit, and the magnet exciting coil is used for controlling the damping of the spring vibration isolator. The damping response speed is increased, the effective action size is reduced in the working state, energy consumption is reduced, when the piston moves to a certain degree due to external impact, the limiting rod and the coil form mechanical contact, displacement is automatically limited, and therefore the effect of protecting circuit components is achieved.

The invention discloses an aluminum smelting high magnetic field area flue gas monitoring signal anti-interference transmission system, which comprises a signal acquisition module, a signal filtering module, a signal correction module and a signal transmission module, and relates to the technical field of aluminum smelting high magnetic field area flue gas monitoring. And by combining a dynamic parameter adjusting mechanism, electromagnetic interference of an aluminum smelting high magnetic field area is effectively filtered out. Meanwhile, the signal correction module corrects error data through trend analysis and CRC verification, distortion components caused by electromagnetic interference are eliminated in combination with spectral analysis and band elimination filtering, the accuracy and integrity of the smoke monitoring signal are remarkably improved, and the problem that noise, errors and distortion in an original signal affect the monitoring precision is solved; and anti-interference of signal transmission is realized through grading marking and path adaptation design of the signal transmission module.

The invention relates to the technical field of magnetic field monitoring, and discloses an aluminum smelting high magnetic field environment operation data real-time monitoring system and method.The aluminum smelting high magnetic field environment operation data real-time monitoring system comprises a difference sequence calculation module, a noise scale calculation module and a difference noise scale calculation module; the step starting point positioning module is used for determining suspected step starting point time; the least square fitting module is used for performing least square fitting to obtain a fitting model; the same-direction lagging wake calculation module is used for calculating a same-direction lagging wake index; the self-adaptive suppression module is used for calculating a decompensated magnetic field amplitude sequence; and the abnormity judgment module judges whether abnormity exists or not according to the mixed energy. According to the method, interference of slow drift of a magnetic field on noise judgment is suppressed through robust noise estimation, then suspected step starting point time is accurately captured through double-index moving average, compensation components are deducted through a fitting model, and a suppression mask is constructed to eliminate wake interference.

This invention relates to the field of magnetic field detection technology and discloses a magnetic field detection method using a CrTe / ZnTe semi-metallic heterojunction grating structure. The method involves establishing a CrTe / ZnTe semi-metallic heterojunction grating structure through material preparation processes and detector operating frequency bands. A magnetic field is then applied to the CrTe / ZnTe grating structure, establishing a theoretical model that correlates the magnetic field strength with the response spectrum characteristics. The designed structure is fabricated using an etching process, and the sample is then packaged and tested. The invention proposes designing a CrTe / ZnTe semi-metallic heterojunction grating structure and utilizing changes in the response spectrum of the CrTe / ZnTe grating structure to detect the magnitude of the external magnetic field. Even slight changes in the magnetic field can affect the magnetoresistance and other properties of the CrTe / ZnTe material, thereby further altering the resonant frequency of the response spectrum of the CrTe / ZnTe grating structure. This method effectively improves the sensitivity, resonant mechanical properties, and temperature stability of magnetic field detection, providing a novel solution for highly sensitive weak magnetic field detection.

The purpose of this disclosure is to provide a heat-assisted magnetic recording (HAMR) writer head with high magnetic field reliability and high accuracy. [Solution] Disclosed are a writer head for a heat-assisted magnetic recording device and a method for manufacturing a writer head. The writer head comprises a plurality of layers, including a waveguide cutoff layer, a waveguide layer, a near-field transducer layer, a heat sink layer, and a peg layer. Each layer has a tapered angle near the air bearing surface. The writer head further has a principal axis pole adjacent to an optical component having a similar tapered angle near the air bearing surface.

The application relates to a relay, a first avoiding part can play the roles of separating, lengthening and blocking an arc, the arc burning time is reduced, and the position of an arc starting point can be controlled. In addition, the first avoiding part is formed at a position with relatively weak magnetic field intensity of at least one of the first contact part and the second contact part, so that the arc starting point position can be controlled at a position with relatively high magnetic field intensity, thereby having a strong arc starting effect, meanwhile, the first avoiding part is adjacent to the arc starting point position, quick arc breaking can be realized, the arc separation effect is obvious, arc ablation of an inner cavity and explosion of the relay and other defects can be effectively avoided, the product performance can be ensured even under high load, and the product failure probability can be reduced.

The utility model discloses a kind of magnetic field generator based on mechanical wave, it is related to electromagnetic induction technical field, the utility model is by being arranged between ultrasonic wave transmitting unit and magnet cantilever beam of strip structure, when ultrasonic wave transmitting unit sends ultrasonic wave, when the frequency of ultrasonic wave and the natural frequency of cantilever beam match consistent, cantilever beam will appear resonance phenomenon with ultrasonic wave, it can be based on the resonance enhancement characteristics of cantilever beam, in the divergent space surrounded by cantilever beam, the amplitude of ultrasonic wave is caused to increase, to drive magnet substantially moves, produce the alternating magnetic field of higher magnetic field intensity, it can be widely applied in ultrasonic wave transducer and many other fields.

According to the integral blade type oil-immersed transformer and the temperature control method, a plurality of propeller type rotating blades with the outer diameter not smaller than 1 / 2 of the minimum size of the cross section of the box body in the vertical direction are arranged in the transformer box body, and transformer oil is driven to form circulating oil flow during rotation; the turbulence effect in an oil cavity is enhanced through axial eddy generated by the large-size blades, oil products in different areas in the box body are promoted to integrally flow in a turbulent mode, the heat exchange and soaking process of upper and lower layers and high and low temperature areas is accelerated, and the heat dissipation efficiency is improved; and the defoaming rods are arranged between the adjacent propeller type rotating blades, and the defoaming vertical rods are densely and vertically arranged on the surfaces of the defoaming rods, so that bubbles generated at the rotating tails or edges of the blades can be broken, the bridging discharge risk caused by bubble aggregation in a high-voltage and high-magnetic-field environment is effectively eliminated, the burning accident of the transformer is avoided, and the operation safety is guaranteed.

The invention discloses a high magnetic field permanent magnet orientation structure based on injection molding samarium-cobalt magnet molding, which comprises a polygonal first center magnet and a polygonal second center magnet, a lower mold orientation group is arranged outside the first center magnet, an upper mold orientation group is arranged outside the second center magnet, and according to the magnet structure and arrangement of the upper mold orientation group and the lower mold orientation group, the high magnetic field permanent magnet orientation structure is formed. The orientation of the N pole and the S pole is adjusted, the orientation magnetic field intensity of the permanent magnet orientation process is remarkably improved, and the problem of orientation unsaturation of a high-coercivity material is solved. The structure adopts a full permanent magnet orientation design, and compared with an electromagnetic orientation device, the mold manufacturing cost and the energy consumption cost are reduced by 30%.

The application discloses a kind of hyperpolarized inert gas FID signal resonance frequency accurate measurement method, belong to atomic molecule and optical physics, signal detection and analysis field.For the FID signal of hyperpolarized inert gas, since signal itself oscillation decay with time, the length of sampling time is limited therefore the resolution of spectrum is limited, in turn, the precision of magnetic field measurement is influenced.The present application significantly improves the frequency resolution by refining spectrum and frequency estimation in succession, and has important significance for improving the precision of magnetic field measurement.

The present invention provides a refrigeration system for a magneto-optical measurement device and its control method. The GM refrigerator is externally placed and a helium gas circulation throttling expansion structure is adopted to obtain ultra-low temperature liquid helium at 2K and below using the GM refrigerator without consuming a large amount of liquid helium. Moreover, a low-loss liquid delivery pipe is used to connect the GM refrigerator and the optical high magnetic field thermostat, and a fixing bracket is used to fix the low-loss liquid delivery pipe, thereby filtering out the vibration transmitted from the GM refrigerator part, achieving experimental conditions of ultra-low temperature, high magnetic field, and ultra-low vibration. At the same time, after the cooled liquid helium enters the optical high magnetic field thermostat, it is divided into two parts without mutual influence and is respectively used to cool the sample area and the magnet cold shield, thereby improving the cooling efficiency and reducing the consumption of liquid helium.

The invention discloses a method for separating correlation principal components of multiple noise sources in an atom magnetometer, which is used for quantitatively analyzing the influence of the multiple noise sources in the atom magnetometer on magnetic field measurement output noise by utilizing a correlation principle so as to identify the main noise sources of the atom magnetometer. The atomic gas chamber electric heating system is taken as an example, the influence of a noise source of the electric heating system on magnetic field measurement output noise is specifically quantified, and a correlation analysis method and a principal component analysis method are combined, so that principal components related to a main noise source of the electric heating system are separated from the magnetic field measurement output noise; and the signal-to-noise ratio of a magnetic field measurement output signal is improved. Compared with a traditional method, the main noise source of the magnetic field measurement system can be accurately positioned, and a basis is provided for improving the signal-to-noise ratio of a magnetic field measurement output signal. In addition, the method is not only suitable for noise analysis and separation of an electric heating system, but also suitable for noise analysis of other systems in magnetic field measurement.

The present invention belongs to the technical field related to refrigeration and cryogenic containers, and discloses a eddy-current-free liquid helium cryostat for use in a pulsed high-magnetic field environment. The cryostat comprises a sample rod, a helium chamber, a liquid nitrogen layer, a vacuum chamber, and a tail pipe. The tail pipe is composed of an inner epoxy tail pipe and an outer epoxy tail pipe, each of which is mounted via metal flanges. The epoxy tail pipe and the metal flanges are bonded together with epoxy sealant. The vacuum interlayer between the helium chamber and the vacuum chamber is interconnected with the vacuum interlayer between the inner epoxy tail pipe and the outer epoxy tail pipe. In addition, the metal flange of the inner tail pipe is precisely mounted concentrically from top to bottom, and a removable metal seal is achieved between the metal flange of the inner tail pipe and the bottom flange of the helium chamber. The present invention effectively solves the problem of liquid helium loss caused by Joule heat generated by induced eddy currents in a pulsed high-magnetic field environment in the prior art, while significantly improving the measurement accuracy of scientific experiments in a high-field pulsed high-magnetic field environment.

This application belongs to the field of metal electromagnetic high-speed forming manufacturing technology, specifically disclosing a method and system for obtaining an electromagnetic forming actuator. The method includes: determining the basic structural parameters of the electromagnetic forming actuator with the goal of maximizing the magnetic energy utilization efficiency and the electromagnetic force impulse on the workpiece; obtaining the bottom morphology function of the electromagnetic forming actuator based on the electromagnetic forming force field requirements, and determining the parameters to be optimized and their value ranges in the bottom morphology function; determining a typical deformable workpiece configuration based on the workpiece deformation process and the target forming shape; calculating the weighted average of the magnetic field distribution uniformity index and magnetic energy efficiency of the electromagnetic forming actuator with different bottom morphology parameters on the typical deformable workpiece configuration; and selecting the optimal bottom morphology parameters based on a multi-objective optimization model with the goal of improving the magnetic field uniformity and magnetic energy efficiency. This application fundamentally solves the problem of uneven electromagnetic force caused by the structure of the electromagnetic forming actuator.

The present invention provides a Hall element and a current sensor that can achieve both high precision and high sensitivity, have low power consumption, and suppress reliability variations even when a high magnetic field is applied. The Hall element includes: a substrate (11) containing gallium arsenide; an active layer (12) formed on the substrate and containing indium arsenide, having a film thickness of 0.63 μm or more and less than 1.45 μm; and an inactive layer (13) formed on the active layer, having a film thickness of 3 nm or more and less than 100 nm, and the film thickness ratio of the inactive layer to the active layer is 0.005 or more and less than 0.067. Thereby, it is possible to provide a Hall element and a current sensor that can achieve both high precision and high sensitivity, have low power consumption, and suppress reliability variations even when a high magnetic field is applied.

The application discloses a quench characteristic test sample rod suitable for high magnetic field and quasi-adiabatic working conditions, which comprises a lead sleeve and a vacuum cavity module, the bottom end of the lead sleeve is detachably connected with the vacuum cavity module through a butt flange, the vacuum cavity module comprises a heat insulation centering mechanism arranged in an inner cavity, the upper and lower ends of the heat insulation centering mechanism are respectively provided with an upper copper ring and a lower oxygen-free copper ring, and an embedded copper heater is sleeved on the heat insulation centering mechanism, a plurality of superconducting tape samples to be tested are uniformly and circumferentially arranged on the outer wall of the embedded copper heater, and the two ends of each superconducting tape sample to be tested are respectively welded and fixedly connected with the upper copper ring and the lower oxygen-free copper ring. The application utilizes the indium compression sealing of the vacuum cavity module to provide quasi-adiabatic working conditions for testing, can reduce the heat exchange between the normal state region of the superconducting tape and the environment, reduce the heat loss of the superconducting tape in the conduction process, and thus improves the accuracy of the quench propagation characteristic test of the superconducting tape.

This application belongs to the technical field of pulsed high magnetic fields, and specifically discloses a single-turn coil type destructive pulsed magnet. The pulsed magnet includes: a magnet coil and two parallelly arranged discharge electrode plates; the magnet coil is a single-turn coil, and the single-turn coil includes an outer metal layer and an inner metal layer connected in sequence. The electrical conductivity of the inner metal layer is less than that of the outer metal layer, and in the radial direction perpendicular to the central axis passing through the single-turn coil, the first thickness of the inner metal layer is less than the second thickness of the outer metal layer; both ends of the single-turn coil are respectively connected to one of the discharge electrode plates for coil discharging. Through this application, the heat conduction process from the inner surface of the coil to the air domain can be effectively inhibited, preventing thermal damage to the sample within the coil aperture; at the same time, the situation where the magnetic field generated at the center point of the coil decreases can be prevented, ensuring the test performance.