140 results about "Helmholtz coil" patented technology

The invention provides a device and method for testing the reliability of a power sensor, and the device comprises a magnetic field generation unit which is used for providing an alternating current for a Helmholtz coil through a power frequency current source, and generating a controllable magnetic field; the electric field generating unit is used for providing a high-voltage direct current or power frequency alternating current power supply for the parallel-plate capacitor through a high-voltage generator to generate a uniform electric field; the tested unit is used for providing a standard excitation signal through a standard source matched with the to-be-tested sensor, simulating an input condition of the to-be-tested sensor under an actual working condition and collecting output data of the to-be-tested sensor; and the control unit is used for setting test parameters, generating a control instruction according to the test parameters and generating a test result according to the output data. According to the device and the method, by simulating a strong magnetic field and a strong electric field environment and combining application of various measured parameters and an automatic control system, the reliability evaluation requirement of the sensor under the actual working condition is fully met.

The invention discloses an optical element measurement centering tool for a ship clutch shaft, and relates to the technical field of centering measurement tools, the optical element measurement centering tool comprises a fixing part, a shaft fixing assembly and a laser detection assembly, a mounting groove is formed in the surface of the fixing part, and under the cooperation of the laser detection assembly, a Helmholtz coil generates a uniform magnetic field to drive a magnetic needle to be oriented; the perpendicularity error of the reflective mirror and the axis of the magnetic needle is small, a dynamic vertical reference is provided for a laser beam, the problem of reference drift caused by ship vibration and shaft system inclination is solved, the laser beam is converted into parallel light through the collimating lens, the optical axis overlap ratio error is low, and then through cooperation of the pneumatic hinge and the vertical lead screw guide rail, the laser beam can be accurately measured. Initial alignment of the laser beams is completed in a very short time, fine trimming of light spots is achieved, efficiency is effectively improved compared with manual adjustment, the reflection angles of the reflectors are synchronously adjusted, it is ensured that the laser beams are perpendicular to the surface of the shaft all the time, physical contact errors of traditional contact type measurement are avoided, and measurement accuracy is improved.

The invention relates to the technical field of micro-nano robots, and provides a motion control method and system for a magnetic control micro-nano robot carrying medicine in a simulation environment, and the method comprises the steps: obtaining a motion image of a magnetic control silicon dioxide-based micro-nano robot cluster in the simulation environment in real time; according to a preset transportation task, the current state of the micro-nano robot cluster is judged; based on the current state of the micro-nano robot cluster, establishing a magnetic field generated by the micro-nano robot cluster and the three-dimensional Helmholtz coil, a fluid resistance field of a simulation environment and a dynamic model of a simulation environment channel boundary condition; and based on the motion image acquired in real time, using a deep learning model to identify real-time pose information of the micro-nano robot cluster and the simulated environment channel boundary information, and using a path planning algorithm to perform trajectory planning according to the real-time pose information and the simulated environment channel boundary information. And the magnetic field is adjusted to control the movement of the micro-nano robot cluster.

The invention provides a geomagnetic compensation and bias magnetic field generation system and method for cold atom interference. The system comprises a triaxial magnetometer, a triaxial Helmholtz coil, a voltage-controlled current source and an FPGA regulation and control module. The three-axis magnetometer is used for collecting space magnetic field data at a plurality of monitoring positions in the space where the three-axis Helmholtz coil is located in real time; the FPGA regulation and control module is used for calculating control voltage data required by the voltage-controlled current source according to a target magnetic field and any space magnetic field data collected by the three-axis magnetometer in each sampling period, controlling coil current transmitted to the three-axis Helmholtz coil, and outputting the coil current to the three-axis Helmholtz coil. And loop iteration is carried out until the three-axis Helmholtz coil generates a target magnetic field at a plurality of monitoring positions, wherein the target magnetic field is a near-zero magnetic field in the X / Y direction, and the magnetic field intensity in the Z direction is constant and is a non-zero value. The device can respond to the change of the environmental magnetic field in real time, and provides a stable and accurate magnetic field environment for the cold atom interference test on the basis of compensating the influence brought by the geomagnetic field.

The invention discloses a zero magnetic shielding device and a use method thereof, and the device comprises a magnetic shielding cylinder which is composed of a shielding cylinder body and a shielding cover detachably connected with the shielding cylinder body. And the non-magnetic multifunctional test frame is arranged in the magnetic shielding cylinder and consists of an arc-shaped seat, a lifting mechanism, a test bedplate, a track, a storage rack, a Helmholtz coil and a folding nylon magnetic sensing assembly. When the magnetic flux and residual magnetism switching test is carried out on the object to be tested in the magnetic shielding cylinder, the non-magnetic multifunctional test frame does not need to be replaced, the efficiency of the magnetic flux and residual magnetism switching test on the object to be tested in the magnetic shielding cylinder is improved, and the advantage of convenient switching test is achieved. And the method has the advantages of high measurement precision and wide application range.

The invention discloses liquid dressing production equipment, and relates to the technical field of medical instrument production equipment.The liquid dressing production equipment is characterized in that firstly, neodymium iron boron magnets of a driving rotary disc and a driven rotary disc are in coupling transmission, and a middle isolation sleeve is matched, so that complete physical isolation inside and outside a kettle is achieved; a uniform magnetic field generated by Helmholtz coils is used for weakening attraction force among particles, a dynamic magnetic field gradient formed by rotation of a permanent magnet arranged in a stirring paddle can cooperate with mechanical shearing, so that the internal structure of an aggregate is deeply destroyed, meanwhile, the Helmholtz coils in three orthogonal directions provide a global uniform static magnetic field, and the aggregate is fully dispersed. The stability of the magnetic background in the kettle can be ensured, the global effect of the dynamic magnetic field gradient is matched, the local defect caused by purely depending on mechanical shearing is avoided, the dispersion uniformity is remarkably improved, the influence of the concentration gradient on the physical and chemical properties is reduced, and the influence of initial agglomeration on the subsequent process can be reduced by utilizing the efficient dispersion capacity of the magnetic mixing assembly.

A calibration system leverages a 3-axis Helmholtz coil device for generating a referential magnetic field for calibrating the magnetometer on-board a vehicle. The calibration system may include the magnetic field generator, a vehicle platform, and a computing device to determine the calibration parameters. The vehicle platform supports the vehicle with the magnetometer being calibrated. The magnetic field generator generates a referential magnetic field in three-dimensional space for calibration of the magnetometer. The computing device is configured to: receive magnetometer measurements from the magnetometer on-board the vehicle during generation of the referential magnetic field, and determine calibration parameters for calibrating the magnetometer based on the magnetometer measurements and the referential magnetic field generated by the magnetic field generator.

An inductive heater assembly for heating a power tool battery pack, the inductive heater assembly comprising a housing, a battery pack interface configured to receive the power tool battery pack, a charging base, a coil portion located within the housing. The coil portion including a first coil winding and a second coil winding configured to generate an electromagnetic field, wherein the first coil winding and the second coil winding to form a Helmholtz coil.

The invention discloses a design method of a multistage nested Helmholtz coil system, and relates to the technical field of general instrument and meter manufacturing. According to the reciprocal analysis design method for the coil structure parameters and the magnetic field characteristics of the multistage nested Helmholtz coil system under the global sensitivity, the optimal design expression of each design parameter of the multistage nested Helmholtz coil system can be determined based on the reciprocal analysis design method, and the multi-parameter expression of the magnetic field characteristics can be obtained; the coil parameter design priority is defined, and an optimization design strategy for the magnetic field design indexes is provided. When a macroscopic design requirement of a target uniform magnetic field is provided, an optimal solution of each design parameter of the multistage nested Helmholtz coil system can be directly obtained. According to the method, the Helmholtz coil can be efficiently and accurately improved and designed according to needs.

The present invention relates to the field of magnetron sputtering technology, and specifically discloses a magnetron sputtering silver-coated conductive material powder device based on an ultrasonic-electromagnetic suspension composite dispersion system and its application. In response to the technical difficulties of powder agglomeration, low target utilization rate and poor uniformity in large-scale production, the present invention uses a porous ceramic tooling disk as the core carrier, integrates a high-frequency ultrasonic vibrator array (adjustable at 20-100kHz), a planar rectangular cathode (tilt angle 0-15°) and a Helmholtz coil (0.1-0.5T rotating magnetic field), and realizes non-contact dispersion of powder and precise coating of silver layer through cavitation effect, electromagnetic suspension and multi-target collaborative sputtering. The tooling disk adopts a gradient aperture design, combined with liquid nitrogen microchannel cooling and modular cavity structure, so that the powder dispersion uniformity (CV value <5%), silver layer porosity (<1%), target utilization rate (52%) and single furnace production capacity (72kg / 8h) are significantly optimized, providing an efficient and environmentally friendly industrial solution for the field of electronic materials.

The invention relates to the technical field of miniature medical robots, and discloses a magnetic liquid metal-based soft drug-loaded capsule robot, which comprises a soft capsule robot main body, a soft capsule robot cover and a degradable sealing sleeve, the soft capsule soft robot main body comprises a bottom fan-shaped magnetic liquid metal storage cabin, a left fan-shaped medicine storage cabin, a left rectangular medicine release port, a right fan-shaped medicine storage cabin and a right rectangular medicine release port. According to the soft drug-loaded capsule robot based on the magnetic liquid metal and the preparation and driving method of the soft drug-loaded capsule robot, a Helmholtz coil is used for generating a clockwise rotating composite magnetic field on a YZ plane, and anticlockwise rolling of a capsule is achieved through magnetic response of the magnetic liquid metal; the problem of limited energy supply of the micro-robot is solved through driving of an external magnetic field, and movement in any direction and accurate positioning are supported; the gelatin sealing sleeve is melted through external laser irradiation, and instant release of the medicine is achieved (suitable for emergency treatment).

The invention discloses a Helmholtz coil material lightning magnetic field shielding performance measuring device, which comprises a magnetic field generation device, a shielding test box is arranged in a magnetic field coverage range of the magnetic field generation device, an open hole is formed in the shielding test box, and the open hole enables a magnetic line of force of the magnetic field generation device to transversely penetrate through the shielding test box. The shielding test box is internally provided with the signal measurement unit, the signal measurement unit measures the magnetic field in the shielding test box, the lightning stroke magnetic field environment is accurately simulated, and the repeatability and accuracy of the shielding performance test are improved. The invention further discloses a method for measuring the lightning magnetic field shielding performance of the Helmholtz coil material, the lightning magnetic field shielding performance of the measured shielding material is measured by applying the device for measuring the lightning magnetic field shielding performance of the Helmholtz coil material, and the problem that traditional measurement is poor in accuracy is effectively solved.

The application discloses a geomagnetic vector measurement system compensation method based on a three-dimensional helmholtz coil, and steps include: S01. Constructing a geomagnetic vector measurement system interference magnetic field compensation model; S02. Placing the geomagnetic vector measurement system in the center region of the three-dimensional helmholtz coil, and generating magnetic field data of different directions and different sizes through the three-dimensional helmholtz coil, so as to obtain multiple groups of measurement data, wherein the measurement data include output values of three-axis magnetic field sensors, true values generated by the three-dimensional helmholtz coil and a change rate of the true values generated by the three-dimensional helmholtz coil with time; S03. Obtaining an error model equation group according to the data obtained in the step S02 and the geomagnetic vector measurement system interference magnetic field compensation model; and S04. Solving parameters in the error model equation group, and compensating the magnetic interference field of the geomagnetic vector measurement system by using the solved parameters. The application has the advantages of simple operation, low cost, high compensation precision, strong flexibility and the like.

The invention provides an electromagnetic field constraint system and constraint method for a CO2 laser amplifier, and the system comprises a spiral electrode which is wound on a discharge tube of the CO2 laser amplifier, the spiral electrode comprises a first DC positive electrode, a radio frequency positive electrode, a second DC positive electrode and a ground electrode which are sequentially and adjacently arranged, and the current flows through the first DC positive electrode in the electric field direction from the first DC positive electrode to the ground electrode. The electric field direction of the current from the second direct current positive electrode to the ground electrode is partially perpendicular to the electric field direction of the current from the radio frequency positive electrode to the ground electrode; the CO2 laser amplifier discharge tube and the Helmholtz coil are coaxially arranged, and the magnetic field direction of the Helmholtz coil is perpendicular to the electric field direction from the radio frequency positive electrode to the ground electrode. In the discharge area of the CO2 laser amplifier, the strong electromagnetic field restraint system is adopted, the vertical alternating high-voltage electric field and the vertical alternating high-voltage magnetic field are used for restraining plasma movement, the electro-optical conversion efficiency can reach about 20%, the CO2 laser power can be effectively improved, and the arc discharge problem under the high radio frequency power injection condition is avoided.

The invention discloses an array coil excitation coupling eddy current detection probe, system and method and a related device, and relates to the technical field of nondestructive testing. The probe comprises a double-coil excitation module and a sensing module; the double-coil excitation module comprises two semicircular Helmholtz coils; the two semicircular Helmholtz coils are symmetrically arranged, are parallel and coaxial, and are electrified with alternating-current excitation current with the same direction, the same frequency and the same phase; the distance between the two semicircular Helmholtz coils is adjustable; and the sensing module is arranged in the central area of the two semicircular Helmholtz coils and is used for detecting the magnetic field change caused by the eddy current field at the defect. According to the invention, the detection precision of pipeline corrosion, cracks and composite defects can be improved.

The invention provides a method for detecting the residual magnetic quantity of a permanent magnetic ferrite magnetic shoe. The method comprises the following steps: carrying out surface cleaning treatment on a permanent magnetic ferrite magnetic shoe to be detected; measuring the volume of the magnetic tile; peelable soft magnetic auxiliary layers are uniformly coated on the inner cambered surface, the outer cambered surface and the bottoms and the side walls of the grooves at the two ends of the magnetic tile, the relative permeability of the soft magnetic auxiliary layers is 10-100 times that of the magnetic tile body, and the spraying thickness is 0.2-0.6 mm; after the soft magnetic auxiliary layer is naturally aired, performing constant-temperature treatment on the magnetic tile; the magnetic shoe is placed in the center of a magnetizing coil, saturation magnetizing is carried out, and the magnetizing direction is consistent with the thickness direction of the magnetic shoe; stripping the soft magnetic auxiliary layer after magnetizing; a Helmholtz coil method is adopted to measure the magnetic flux of the magnetic shoe, and volume data is combined to convert the residual magnetic quantity.

The invention provides a three-axis coil error parameter identification method and device based on Kalman filtering, a medium and electronic equipment, and belongs to the technical field of motor control. According to the method, an error parameter identification model of a three-axis Helmholtz coil under the condition that a single-group coil offset error and a three-axis non-orthogonal error are superposed is constructed, and interference parameters in the error parameter identification model are identified by adopting a Kalman algorithm; according to identification interference parameters obtained through identification, a central uniform region vector magnetic field of the same three-axis Helmholtz coil under all current conditions is obtained through calculation; the method can effectively solve the problem that a traditional least square method or a neural network method is low in reliability of magnetic field simulation of the three-axis Helmholtz coil, magnetic field calculation errors caused by interference coefficient errors of the three-axis Helmholtz coil are remarkably reduced, and the identification accuracy is greatly improved.

The invention discloses a multi-magnetization direction selection optimization method and device based on magnetoacoustic emission stress detection, and the method comprises the steps: applying excitation to two pairs of orthogonal Helmholtz coils based on two excitation sources with the same frequency but different amplitudes, so as to generate an alternating magnetic field to magnetize a to-be-tested test piece; the method comprises the following steps: acquiring a magnetoacoustic emission signal of a test piece to be tested, processing the magnetoacoustic emission signal to obtain an enhanced magnetoacoustic emission signal, carrying out Wiener filtering processing on the magnetoacoustic emission signal under a stress group corresponding to each magnetization direction, extracting an envelope line, extracting a plurality of peak signals from the envelope line, and calculating an average peak value of the plurality of peak signals. A multidirectional equal dynamic adjustment magnetization mode is adopted, magnetic fields in different directions are generated by using an orthogonal coil, the optimal magnetization direction is selected by comparing stress changes, multidimensional stress components can be captured, the detection sensitivity and accuracy are improved, information omission is avoided, and the method is suitable for complex stress fields.

The invention relates to an amorphous alloy wire continuous annealing device and method based on an alternating load auxiliary magnetic field. In magnetic field equipment of the device, a transverse Helmholtz coil transversely surrounds the periphery of a heat treatment furnace, the axial direction of the transverse Helmholtz coil is perpendicular to the wire penetrating direction, and a longitudinal Helmholtz coil longitudinally surrounds the periphery of the heat treatment furnace, and the axial direction of the longitudinal Helmholtz coil is parallel to the wire penetrating direction; in the heat treatment furnace, a hearth is arranged in a furnace box, and heating equipment is arranged on the hearth; in the alternating load equipment, a clamp is arranged on a three-dimensional combined table to clamp the amorphous alloy wire, and the tensile load is detected; in the winding device, a wire feeding roller winds the amorphous alloy wire and feeds the wire to the heat treatment furnace before annealing is started, after the amorphous alloy wire is clamped by the alternating load devices on the two sides, annealing is conducted under the conditions of a dynamic magnetic field and alternating loads, and a wire winding motor drives a wire winding roller to complete wire winding. Compared with the prior art, isotropic release of an internal stress field of the amorphous alloy wire is effectively promoted, and the amorphous alloy wire is better designed for materials with specific magnetic anisotropy requirements.

The utility model discloses a device for measuring two-dimensional magnetic induction intensity on an axial plane of a Helmholtz coil, and belongs to the technical field of electronic components. The device comprises a two-dimensional Hall probe, a stepping motor guide rail moving circuit and a high-precision voltage acquisition module, wherein the two-dimensional Hall probe consists of a two-dimensional Hall probe mounting base and two linear Hall sensors which are orthogonally mounted on the two-dimensional Hall probe mounting base; the stepping motor guide rail moving circuit and the high-precision voltage acquisition module are connected with the two-dimensional Hall probe; two ends of the high-precision voltage acquisition module are respectively connected with the two-dimensional Hall probe and the computer. According to the utility model, the symmetrical distribution characteristic of the Helmholtz coil magnetic field is utilized, the two-dimensional Hall probe is designed by using the two mutually orthogonal Hall sensors, and the three-dimensional space magnetic field distribution is reflected by measuring the two-dimensional magnetic field of the 1 / 4 axis plane of the Helmholtz coil; the high-precision voltage acquisition module is designed based on the single-chip microcomputer, so that measurement errors are effectively Compared with an existing device of the same type, measurement is easier and more convenient, experimental data processing is easier and more intelligent, and the expandability of the device is higher.

The invention discloses a diamond particle NV axis coordinate system pointing calibration method comprising the following steps: adjusting the distance and angle of a permanent magnet relative to a diamond NV color center to obtain an eight-peak ODMR spectrum signal; carrying out magnetic field parameter calculation based on the eight-peak ODMR spectrum signal to respectively obtain magnetic field components of a permanent magnet magnetic field and a Helmholtz coil magnetic field in a diamond orthogonal three-axis coordinate system; generating magnetic field components with different intensities and directions by using a three-axis Helmholtz coil, and resolving a transformation matrix from a space rectangular coordinate system to a diamond orthogonal three-axis coordinate system; and according to the conversion matrix from the space rectangular coordinate system to the diamond orthogonal three-axis coordinate system, and in combination with the conversion matrix from the diamond orthogonal three-axis coordinate system to the NV-axis coordinate system, obtaining a conversion relation from the space rectangular coordinate system to the NV-axis coordinate system. According to the invention, through magnetic field parameter calculation and matrix conversion, calibration of the NV-axis coordinate system direction of the diamond particles is realized.

An example system for magnetic resonance imaging (MRI) guided proton therapy includes a source configured to generate and emit a heavy ion or proton beam; and an MRI assembly including at least one segmented coil magnet comprising a plurality of windings, where the plurality of windings of the at least one segmented coil magnet include a medium or high-temperature superconductor such that the at least one segmented coil magnet does not require a cryogenic liquid for cooling. An example magnet for MRI proton therapy includes field coils and shield coils arranged in Helmholtz coil pairs, where the field coils and the shield coils include a medium or high-temperature superconductor so the magnet does not require cryogenic liquid cooling, and where the field coils and the shield coils form a central opening through which a heavy ion or proton beam is directed during proton therapy.

The invention discloses a bionic camouflage briefcase with an electromagnetic emission function, the bionic camouflage briefcase comprises an outer bionic structure, a middle layer and an inner layer structure, the outer bionic structure comprises a rotatable handle and a layered shell, and the handle is internally provided with a firing button, an emission mode selection button and a fingerprint unlocking device; the inner layer control area comprises a laser rapid aiming device; the middle layer comprises a pulse transmitting device and a pulse energy storage device, the pulse transmitting device is composed of multiple stages of Helmholtz coils in an array mode, the pulse energy storage device is composed of multiple pulse capacitors in an array mode, the pulse capacitors and the multiple stages of Helmholtz coils are connected in parallel to provide transient electric energy, and a transmitting tube is arranged on one side of each stage of Helmholtz coil; unification of camouflage and functionality is realized, the concealment is high, and the exposure risk is reduced; and a multiple safety control mechanism is adopted, so that false triggering and unauthorized use are prevented.

The application relates to the field of laser additive manufacturing, and particularly discloses a laser coaxial wire additive manufacturing device and method based on double magnetic field cooperation, which comprises a motion system, a coaxial wire additive manufacturing system, a double magnetic field auxiliary system and a control monitoring system, and is externally provided with a wire feeding mechanism. The double magnetic field auxiliary system is composed of a magnetic pressure induction system and a symmetric sliding magnetic field generation system; the magnetic pressure induction system is arranged around a welding head to generate a vertical magnetic field; the symmetric sliding magnetic field generation system generates a horizontal magnetic field through Helmholtz coils on two sides; the two magnetic field systems are independently adjustable and are orthogonally arranged in space. The device is provided with a high-speed camera to monitor the molten pool state in real time, the magnetic field strength and proportion are dynamically adjusted through a controller and double electromagnetic generators, and accurate control of molten drop transition and molten pool flow is realized. The application improves the quality and stability of coaxial wire additive manufacturing.

This invention discloses an anti-clogging biofiltration device coupled with a microbial fuel cell, applied in the field of biofiltration technology. It includes: a biofilter consisting of a porous media coarse filter layer, a cathode region, and an anode region arranged sequentially from top to bottom; a Helmholtz coil array deployed around the biofilter; and an external circuit that, together with the anode and cathode regions, constitutes the microbial fuel cell. The microbial fuel cell provides self-sufficient power to the cathode region, anode region, and Helmholtz coil array for anti-clogging biofiltration. This invention effectively solves the problems of accumulated clogging in EPS (expanded power filters) and the inability to clean the bottom filter media, and realizes self-generated electricity for the microbial fuel cell.

The application discloses a design method of a multi-stage nested Helmholtz coil system and relates to the technical field of general instrument manufacturing. The application provides a mutual inverse analysis and design method of coil structure parameters and global sensitivity of magnetic field characteristics of a multi-stage nested Helmholtz coil system, based on which, the optimal design expression of each design parameter of the multi-stage nested Helmholtz coil system can be determined, the multi-parameter expression of the magnetic field characteristics can be obtained, the priority of the coil parameter design is determined, and the optimization design strategy aiming at the magnetic field design index is provided. When the macro design requirement of the target uniform magnetic field is provided, the optimal solution of each design parameter of the multi-stage nested Helmholtz coil system can be directly obtained. The application can efficiently and accurately improve the design of the Helmholtz coil according to the requirement.

The invention relates to the field of biomedical research, and discloses a controllable magnetic field generation device which comprises a magnetic field generation device and a heat effect comparison device which are separated through a heat insulation plate. The magnetic field generation device and the heat effect comparison device comprise a magnetic field control table and a Helmholtz coil group mounted above the magnetic field control table; a transverse guide rod penetrates through the center of the movable base on the left side and the right side above the magnetic field control table, symmetrical transverse screws are arranged on the surfaces of the two ends of the transverse guide rod, the transverse screws are screwed to the center of the movable base through threads, and an adjusting rotary handle is fixedly connected to the end of the transverse guide rod. Compared with the prior art, the device has the advantages of concentrated and stable magnetic field intensity, convenience in magnetic field type regulation and control, weak heat effect and the like, and solves a series of problems of poor magnetic field uniformity, inconvenience in magnetic field type regulation and control, great influence of heat effect on experiments and the like.

The application provides a kind of magnetic shielding assembly shielding effectiveness evaluation method and device, it is related to magnetic shielding assembly shielding effectiveness evaluation technical field.Magnetic shielding assembly is placed in the axis center of helmholtz coil, and evaluation method includes: in the case where helmholtz coil is unloaded, with first set step, the magnetic field value inside N magnetic shielding assembly is measured, and unloaded magnetic field value is obtained;Control constant current source output current, so that helmholtz coil generates working magnetic field;In the case where helmholtz coil generates working magnetic field, first set step is measured again, and the magnetic field value inside N magnetic shielding assembly is obtained, and loading magnetic field value is obtained;According to the unloaded magnetic field value and loading magnetic field value of the same position of magnetic shielding assembly, the internal magnetic field difference value of magnetic shielding assembly is calculated;According to internal magnetic field difference value and working magnetic field, the shielding effectiveness value of magnetic shielding assembly is calculated, to determine whether the shielding effectiveness of magnetic shielding assembly is qualified.The application can realize efficient and accurate evaluation before magnetic shielding assembly assembly.

The present application relates to a kind of low-frequency magnetic field generator for rat electromagnetic experiment and its uniform area measuring method, the method includes the following steps: S1, analysis display terminal calculates the magnetic induction intensity distribution of Helmholtz coil under given condition, and according to the change of magnetic induction intensity relative error determines the uniform area of magnetic field distribution, is recorded as reference area, corresponding boundary is reference boundary;S2, using magnetic field probe coil measures the magnetic induction intensity on reference boundary;S3, least square method is applied to obtain the measured boundary of magnetic field distribution uniform area;S4, according to the average absolute percentage error of magnetic induction intensity at measured boundary and reference boundary determines its actual uniform boundary;S5, analysis display terminal displays the actual uniform area of Helmholtz coil magnetic field distribution under given current amplitude and frequency, for rat electromagnetic experiment.Compared with prior art, the present application has the advantages of obtaining accurate magnetic field uniform area, reducing test workload and the like.

A quantum sensor, and method and computer program product for creating a quantum sensor. A substrate may be fabricated. A microwave antenna may be coupled to the substrate. At least a portion of a 3D Helmholtz coil may be coupled to the substrate. One or more processors may be coupled to the substrate. One or more storage devices may be coupled to the substrate. A photonics integrated circuit may be coupled to the substrate.