512 results about "Magnetic orientation" patented technology

A method for determining an approach of a person toward a transportation vehicle, a computer program, an apparatus, and a system. In response to UWB technology or other radio-based distance systems being used for the Kessy access, the distance information relating to a user is gathered. In response to the access device containing an acceleration sensor, the movement sequence relating to the distance information is analyzed. The magnetic orientation of a transportation vehicle is known when the transportation vehicle is parked, and this information is included in the analysis. In the course of the calculation, directional vectors are included in the approach detection, and the individual positions are easily calculated.

A magnetic alignment system can include a primary annular magnetic alignment component and a secondary annular magnetic alignment component. The primary alignment component can include an inner annular region having a first magnetic orientation, an outer annular region having a second magnetic orientation opposite to the first magnetic orientation, and a non-magnetized central annular region disposed between the primary inner annular region and the primary outer annular region. The secondary alignment component can have a magnetic orientation with a radial component. Additional features, such as a rotational magnetic alignment component and / or an NFC coil and circuitry can be included.

The invention discloses a magnetic moment comparator device and a measurement method. The magnetic moment of the current-carrying standard coil is in direct proportion to the magnetic field generated at a fixed distance on the axis, and according to the principle that a magnetic dipole layer and the current-carrying coil have equivalence in electromagnetism, when the space magnetic field can be accurately measured, the current-carrying standard coil can be used for measuring the magnetic moment of a magnetic sample at the same position. A magnetic moment comparator is designed in a magnetic shielding cylinder, an atomic magnetometer is used for measuring an absolute magnetic field with high sensitivity, a current-carrying standard coil is placed at the position, with the distance being r0, of one side of an atomic gas chamber in the direction of a background magnetic field, and the axis of the current-carrying standard coil is parallel to the direction of the background magnetic field; the magnetic moment direction of the magnetic sample is parallel to the background magnetic field direction, when the magnetic sample is moved by the sample transfer rod to the position, which is r0 away from the atomic gas chamber, of the other side of the atomic gas chamber, the current introduced into the standard coil is changed in real time by keeping the background magnetic field unchanged as a judgment condition, and the magnetic moment of the magnetic sample is equal to the magnetic moment of the current-carrying standard coil; the directions are opposite.

The invention relates to the technical field of power transmission and distribution switches, and discloses a vacuum bypass switch, which comprises an insulating shell, a static end copper bar, a movable end copper bar, a vacuum switch tube, an insulator, a pull rod and a permanent magnetic mechanism, the pull rod is driven by a magnetic field generated by the permanent magnet assembly to drive the moving end copper bar to move in the direction away from the vacuum switch tube so as to realize opening. The first coil and / or the second coil generate / generates a target magnetic field opposite to the magnetic field generated by the permanent magnet assembly in direction under the power-on effect so as to drive the pull rod to drive the movable end copper bar to move towards the vacuum switch tube, and closing is achieved. Closing is achieved through the first coil and / or the second coil, the problem that closing cannot be achieved due to single-coil faults is avoided, and the problem of thermal runaway caused by continuous energization of the single coil is solved. The invention also discloses a bypass switch control system, which controls the energization of the first coil and the second coil through the first energizing loop and the second energizing loop respectively to ensure the reliable closing of the vacuum bypass switch.

The invention provides a method and a system for improving the receiving bandwidth of a very-low-frequency atom magnetometer. The method comprises the following steps of: polarizing alkali metal atoms in an atom gas chamber along the direction of driving laser by using the driving laser; an external magnetic field at the air chamber is compensated through a three-axis magnetic coil and a three-axis magnetic sensor, a zero field environment is provided, and a main magnetic field B is applied by the coil in the direction of driving light; detecting the precession of the spin projection signal of the polarized atom in the x direction by using the detection laser in the x direction; an external very-low-frequency signal interacts with atoms polarized in the z direction to enable the atoms to generate precession signals on the xOy plane, and therefore the external very-low-frequency signal is detected by detection light. After detection optical signals are collected, the control system feeds back the signals to the atom ensemble through the coil in a damping magnetic field mode, the bandwidth of the system is expanded by adjusting feedback parameters, and meanwhile the sensitivity is kept unchanged. According to the technical scheme, the technical problem that high sensitivity and high bandwidth cannot be achieved at the same time in a very-low-frequency atom magnetometer in the prior art is solved.

A magnetic alignment system can include a primary annular magnetic alignment component and a secondary annular magnetic alignment component. The primary alignment component can include an inner annular region having a first magnetic orientation, an outer annular region having a second magnetic orientation opposite to the first magnetic orientation, and a non-magnetized central annular region disposed between the primary inner annular region and the primary outer annular region. The secondary alignment component can have a magnetic orientation with a radial component. Additional features, such as a rotational magnetic alignment component and / or an NFC coil and circuitry can be included.

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 superconducting magnet device and a vector magnetic field loading method. The method comprises the following steps: step 1, determining the size and the direction of a vector magnetic field; the superconducting magnet device and the vector magnetic field loading method are provided. Under the same working magnetic field, the structure space is smaller, the magnetic field utilization rate is higher, the manufacturing cost can be remarkably reduced, meanwhile, the uniformity of the magnetic fields provided by the X coil and the Y coil is higher, meanwhile, the ultra-low vibration performance is achieved under the high magnetic field, the optical or magnetic measurement requirement with the very high vibration requirement can be met, and the application prospect is wide. The superconducting coil is cooled by using the flexible cold conduction belt, the vibration of the superconducting coil can be effectively reduced, the vibration stability of a magnetic field is improved, 0.5-1% of current is overshot when the magnetic field is loaded, and then the current is adjusted to be reduced to a target magnetic field, so that the magnetic field can be quickly stabilized, and the drift effect of the magnetic field is reduced.

A first winding is wound around a first middle column of a first magnetic core, and a second winding is wound around a second middle column of a second magnetic core. The third magnetic core is located between the first winding and the second winding, the third magnetic core has a through hole, and both the first middle column and the second middle column extend into the through hole. When a direction of a magnetic field generated by the first winding is the same as a direction of a magnetic field generated the second winding, the first magnetic core and the second magnetic core generate common-mode inductance. When a direction of a magnetic field generated by a third winding is opposite to a direction of a magnetic field generated a fourth winding, the third magnetic core generates differential-mode inductance.

This invention discloses a passive shimming method based on the displacement of a shimming plate, comprising the following steps: determining a set of shimming plate distribution information using a passive shimming method, including the initial installation position of the shimming plate, the spatial dimensions of the shimming plate, and the shimming plate itself; after installing the shimming plate, measuring the magnetic field distribution information on the surface of the target area, including the magnetic field values ​​of the main magnetic field direction components and the spatial position information of the measurement points; based on the shimming plate distribution information and the magnetic field distribution information, establishing an optimization problem, including a weighted objective function for magnetic field deviation and the total displacement of the shimming plate, and constraints determined based on magnetic field uniformity and the maximum displacement of the shimming plate; solving the optimization problem to obtain the displacement of the shimming plate, and operating the target shimming plate based on the displacement. This invention effectively compensates for shimming errors through the displacement of the shimming plate, avoiding excessive use of the shimming plate during the shimming iteration process.

The invention relates to an orthogonal energy information transmission magnetic coupling structure and system, and relates to the technical field of wireless energy information transmission, the orthogonal energy information transmission magnetic coupling structure comprises a transmitting end and a receiving end, the transmitting end comprises a first magnetic core and a transmitting end integrated coil, and the receiving end comprises a second magnetic core and a receiving end integrated coil; each of the transmitting end integrated coil and the receiving end integrated coil comprises an energy coil for energy transmission and an information coil for information transmission, the information coil comprises a forward information coil and a reverse information coil, the forward information coil is parallel to a plane where the first direction is located, and the reverse information coil is parallel to a plane where the second direction is located. Therefore, the directions of magnetic fields generated by the three coils can be perpendicular to one another, so that signal aliasing and signal crosstalk are reduced, energy loss is reduced, and energy information transmission efficiency is improved.

The invention provides a permanent magnet magnetizing control method based on magnetic domain dynamics and a magnetizer, and particularly relates to the technical field of permanent magnet magnetizing. Obtaining a three-dimensional model of the permanent magnet to be magnetized, and dividing the three-dimensional model into a plurality of magnetic domain units; obtaining a magnetic moment kinetic equation of each magnetic domain unit; magnetic moment directions of the magnetic domain units are randomly distributed when magnetizing is not carried out, the magnetic moments of the magnetic domains do spin precession under the action of an effective magnetic field, and the magnetic moment directions approach to the direction of the effective magnetic field; the magnetic moment direction of each magnetic domain unit at different moments is subjected to numerical solution, and the change track of the magnetic moment direction of the magnetic domain unit from the initial magnetic moment direction is determined according to the instantaneous magnetic moment direction of the magnetic domain unit at different moments; and determining the consistency degree of the magnetic moment direction of each magnetic domain unit according to the change track, and generating a relation graph of the magnetizing saturation, the pulse magnetic field intensity and the pulse duration. According to the method, the magnetizing precision and efficiency can be improved.

The invention relates to the technical field of material magnetostriction, and discloses a hysteresis and magnetostriction strain simulation method and system for a ferromagnetic material. The non-hysteresis magnetization intensity of the ferromagnetic material is determined by utilizing the magnetization energy of the magnetic moments distributed in all directions on the ferromagnetic material in the magnetic field direction and the total free energy in the magnetic domain, and the magnetic energy density of the ferromagnetic material under the non-hysteresis magnetization intensity is determined according to the non-hysteresis magnetization intensity. According to the principle that the internal energy is minimum when the ferromagnetic material reaches mechanical balance, hysteresis and magnetostriction strain models corresponding to the ferromagnetic material under the condition that stress is applied or not are determined according to the magnetic energy density, so that the accuracy of hysteresis and magnetostriction strain simulation is effectively improved; and the simulation analysis of hysteresis and magnetostriction characteristics is more accurate and diversified.

The invention belongs to the technical field of electronic information, and discloses a millimeter wave magnetic coupling variable resonant equalizer, which comprises a transmission waveguide channel, a coupling channel and a resonant cavity which are communicated, the resonant cavity and the coupling channel are arranged in the narrow side direction of the transmission waveguide channel, the opening direction of the coupling channel is parallel to the direction component of an electric field, and the opening direction of the coupling channel is parallel to the direction component of the electric field. The inner walls of the two ends of the resonant cavity are adjustably and slidably connected with adjusting blocks, the opposite inner side faces of the two adjusting blocks are fixedly connected with wave absorbing materials, and the inner wall, facing the coupling channel, of the resonant cavity is detachably and movably connected with a guide block. The center position of the resonant cavity is provided with a telescopic tuning pin perpendicular to the direction component of the magnetic field. According to the structure, the processing and installation problems of a common waveguide equalizer are effectively solved, the equalizer is debugged more simply and quickly, meanwhile, the standing-wave ratio is optimized by changing the cavity structure, and a relatively complex gain curve can be equalized through the good frequency response characteristic.

The invention belongs to the field of magnetic materials. The invention provides a preparation method of a rare earth permanent magnet, which comprises the following steps: weighing rare earth magnetic powder, adding a binder solution, uniformly mixing, and drying until a solvent is completely volatilized to obtain bonded magnetic powder; the bonded magnetic powder is placed in a die cavity of a constant-temperature die for heat preservation and preheating; an inner cavity of the constant-temperature mold is vacuumized to form a vacuum environment, and gas adhering to gaps of the magnetic powder is exhausted; applying a magnetic field to the mold, forming an oriented magnetic field in the mold cavity, arranging easy magnetization axes of the magnetic powder along the direction of the oriented magnetic field, and applying pressing force to obtain a mold pressing blank; and heating and curing the molded green body to obtain the rare earth permanent magnet. The rare earth permanent magnet prepared through the preparation method has high compactness, the residual magnetism and the maximum magnetic energy product capacity of the permanent magnet are improved, rare earth magnetic powder is prevented from being oxidized, and the coercive force of the permanent magnet is remarkably improved.

Devices, systems and methods for magnetic field coupling, as described herein, optimize magnetic coupling between transducers generating and detecting quasistatic magnetic fields by translating the generated and detected magnetic fields into a common frame of reference, such as the Earth's gravitational field. In general, a receiving device has knowledge of the strength and direction of a quasistatic magnetic field generated by a transmitting device, which allows the generated magnetic field to be measured and interpreted by the receiving device in the context of the common frame of reference. Such devices, systems, and methods may use magnetic coupling, for example, for proximity detection and / or for communication between devices. Magnetic coupling may be used for proximity detection, for example, by detecting a magnetic field having a defined magnetic field range and / or by measuring magnetic field strength and / or direction and determining distance and / or location.

The invention discloses a high-temperature pipeline magnetostrictive guided wave sensor and a monitoring method, and relates to the field of ultrasonic nondestructive testing. According to the sensor, a wrinkled iron-cobalt alloy belt is used as a sensitive element, and the sensor is in dry coupling contact with a to-be-detected pipeline; the high-temperature-resistant static magnetic field coil is wound on the outer side of the aluminum pre-tightening ring in a solenoid mode, and a bias pulse excitation mode is adopted. Alternately winding the bottom end of the wrinkle structure of the wrinkle-type ferrocobalt alloy belt and the back surface of the belt material, controlling the wrinkle-type ferrocobalt alloy belt to excite a guided wave signal in a pulse section, and receiving the guided wave signal in a bias section; the dynamic magnetic field and the static magnetic field generated by the two groups of coils are perpendicular in direction, and torsional mode guided waves are generated in the high-temperature pipeline based on the reverse Weidmann effect. The sensor is easy to install and stable in performance, the whole structure is resistant to high temperature for a long time, and the engineering problem of high-temperature failure is solved. The method provided by the invention comprises the steps of optimizing pre-tightening force, pulse voltage and bias current parameters, so that the transduction efficiency is improved, and the capability of detecting new defects of the pipeline in high-temperature and variable-temperature states is enhanced.

The invention discloses a vector magnetic field measurement method based on extended Kalman filtering, and the method comprises the following steps: 1, building a model: building a nonlinear system evolution model and a detection model in an atomic magnetometer; and step 2, establishing an extended Kalman filter to estimate the magnetic field vector. The accuracy of a traditional vector detection scheme depends on a mathematical model for extracting a magnetic field direction from an experimental signal to a great extent, meanwhile, a bias field with very high size and direction accuracy is also needed, and time and labor are consumed. According to the method, the defect that the original atom magnetometer vector magnetic field estimation needs to additionally set a bias magnetic field is overcome, so that the vector information of the magnetic field is more accurately obtained.

The invention provides an embedded rotor which comprises a first permanent magnet which is configured to be a cylinder, is integrally formed and is provided with a plurality of interval grooves in the circumferential direction, and the first permanent magnet is divided into a plurality of first permanent magnet sub-parts by the interval grooves; the second permanent magnets are arranged in the interval grooves; wherein the interval groove is used for accommodating the magnetic field applying device in the orienting and magnetizing process, so that the first permanent magnet obtains permanent magnetism; wherein the first permanent magnet sub-parts have magnetic field directions extending in the radial direction, and the first permanent magnet sub-parts on the two sides of the interval grooves have opposite magnetic field directions; the magnetic field direction of the second permanent magnet extends in the circumferential direction. And the magnetic fields of the second permanent magnets in the interval grooves and the magnetic fields of the first permanent magnets on the two sides of the interval grooves form a continuous magnetic circuit with the shortest path. The invention further relates to an electric machine comprising the in-cell rotor and to a method for producing the in-cell rotor.

The invention discloses a rotation angle detection method, which comprises the following steps of: S1, selecting a plurality of point positions of a rotation angle of a detected object, collecting output voltages of Hall sensors of the point positions, and establishing a matched relational graph between the output voltages of the Hall sensors and the rotation angle of the detected object; and S2, collecting the output voltage y of the Hall sensor at the moment, if the output voltage y of the Hall sensor belongs to the matched point, reading the matched rotation angle of the measured object, and if the output voltage y of the Hall sensor at the moment belongs to the unmatched point, calculating the rotation angle x of the measured object at the moment. According to the principle of the technical scheme, the Hall sensor is arranged in a magnetic field, an included angle is formed between the axial direction of the Hall sensor and the magnetic field direction, at the moment, voltages at the two ends of the Hall sensor correspondingly change, and then the angle change between the axial direction of the Hall sensor and the magnetic field direction is compared and calculated according to the voltage change at the two ends of the Hall sensor. And convenience and rapidness are realized.

The application discloses a method for preparing a metal organic framework film by magnetic field induction regulation control. The method comprises the following steps: vertically immersing a sheet carrier into a film forming solution of the metal organic framework film; placing a container provided with the film forming solution and the carrier into a uniform magnetic field; and standing for 4-24 hours to obtain the metal organic framework film prepared by the magnetic field induction regulation control. The metal organic framework film is a cobalt-based, nickel-based or iron-based metal organic framework film. The carrier material comprises alumina, porous carbon and porous organic material. The magnetic field direction is perpendicular to or parallel to the surface of the carrier. The metal organic framework film prepared by the application has excellent gas separation performance, and the film forming process is simple, convenient, easy to enlarge and popularize.

The invention discloses an ultrafast terahertz response magnetic field measurement method and system based on a linear magneto-optical conversion material, and the method comprises the steps: preparing a linear magneto-optical conversion heterojunction film which comprises at least one signal generation layer with a linear magneto-optical conversion characteristic and at least one signal emission layer with a strong spin-orbit coupling effect; placing the heterojunction thin film at the position of a magnetic field to be measured, and irradiating the heterojunction thin film by using femtosecond laser pumping pulse so as to enable the heterojunction thin film to radiate a terahertz signal; through the terahertz vector detection and rotation detection system, the positive and negative and the magnitude of terahertz signals radiated by the heterojunction film in three groups of orthogonal directions are detected, and the magnetic field direction and the magnitude of the magnetic field position to be detected are calculated based on the three groups of terahertz signals. The sensor has the advantages of being high in sensitivity, high in response speed, non-contact and the like, can achieve rapid detection of various vector magnetic fields such as stable, periodic modulation and sub-picosecond transient pulse, and has hundred-nanometer-scale spatial resolution capacity.

The invention discloses a dry type reactor turn-to-turn short circuit fault positioning method based on a magnetic field direction angle. Obtaining radial and axial magnetic field component data of an outer side designated area under different working conditions; dividing a measurement area according to a reactor structure and magnetic field distribution characteristics; screening optimal measurement areas under different working conditions based on the divided measurement areas and initial moment magnetic field components in the obtained radial and axial magnetic field component data; calculating a magnetic field direction angle of the optimal measurement area under different screened working conditions; making a sensor layout scheme according to the calculated magnetic field direction angles of the optimal measurement area under different working conditions and the change characteristics of the magnetic field direction angles of the measurement points under different working conditions, and determining each measurement point; fault positioning is realized by analyzing the magnetic field direction angle difference between the short-circuit working condition and the normal working condition of each measuring point. According to the method, the problems of insensitive response to the turn-to-turn short circuit fault of the inner layer encapsulation and low positioning precision of a traditional method are solved, and a high-reliability technical scheme is provided for fault detection of the dry-type air-core reactor.

A magnetic material and method prepares high-performance composite ferrite for a self-biased circulator. The preparation method includes: (1) preparing BaM ferrite initial powder and NiCuZnSn ferrite initial powder, respectively; (2) mixing the BaM ferrite initial powder, the NiCuZnSn ferrite initial powder and deionized water uniformly in proportion, performing ball milling in a high-energy ball mill, and then obtaining mixed powder after primary pre-sintering, secondary pre-sintering and secondary ball milling; and (3) obtaining the high-performance composite ferrite for the self-biased circulator by a low-temperature magnetic field orientation forming technology and magnetic field heat treatment. According to the present invention, the saturated magnetization intensity is enhanced better by compounding the BaM ferrite powder and the NiCuZnSn ferrite powder and through a high-energy ball milling technology, the low-temperature magnetic field orientation forming technology and the magnetic field heat treatment technology, thereby improving the microstructure and the magnetic characteristic of bi-phase composite ferrite.

The invention provides a self-excited cesium optical pump atomic magnetometer and a magnetic field measurement method. The magnetometer comprises a physical probe part and a circuit part. The physical probe part comprises a cesium spectrum lamp, an optical element, a cesium atom absorption gas chamber, a radio frequency coil and a photoelectric detector; the circuit part comprises a photoelectric conversion circuit, a phase-locked amplification circuit and a radio frequency excitation circuit modulated by square waves. A macroscopic magnetic moment is generated by pumping cesium atoms through left-handed circularly polarized light, a radio frequency magnetic field induces Larmor precession, light intensity changes are detected and fed back to a radio frequency coil to form self-oscillation, and the external magnetic field intensity is calculated according to the linear relation between oscillation frequency and the magnetic field. Square wave modulation is adopted to broaden the measurement bandwidth, a magnetic field direction adjusting system is additionally arranged to automatically keep an angle of 45 degrees between an optical axis and a magnetic field so as to eliminate a blind area, the hemisphere automatic switching function is achieved, and the advantages of being high in sensitivity, fast in response, high in adaptability, small in size and low in power consumption are achieved.

The invention discloses a passive shimming method based on shimming sheet displacement, and the method comprises the following steps: determining a group of shimming sheet distribution information which comprises the initial installation position of a shimming sheet, the space size of the shimming sheet, and the shimming sheet; after the shimming sheet is installed, magnetic field distribution information, including a magnetic field value of a main magnetic field direction component and spatial position information of a measurement point, of the surface of the target area is measured; based on the shimming piece distribution information and the magnetic field distribution information, an optimization problem is established, and the optimization problem comprises a weighted objective function about magnetic field deviation and total shimming piece displacement and constraint conditions determined based on the magnetic field uniformity and the maximum shimming piece displacement; and solving the optimization problem to obtain the displacement of the shimming sheet, and operating the target shimming sheet based on the displacement. Shimming errors are effectively made up through the displacement of the shimming sheets, and excessive use of the shimming sheets in the shimming iteration process is avoided.

A radio-frequency module includes a module substrate, an inductor, and an acoustic wave filter. The inductor overlaps at least a portion of the acoustic wave filter when seen in a plan view from the normal direction of the module substrate. The inductor includes first and second coils connected in series. Each of the first and second coils is a spiral or helical coil that is wound with more than one turn. At least a portion of the first coil overlaps the second coil when seen in a plan view from the normal direction of the module substrate. A direction of a magnetic field generated by the first coil is opposite to a direction of a magnetic field generated by the second coil.

The invention discloses a light collimator based on magnetic particles and a manufacturing method thereof. The manufacturing method comprises the following steps: uniformly stirring and mixing the magnetic particles and a curing agent solution; adding an epoxy resin solution into the obtained mixed solution, and stirring until the magnetic particles are uniformly distributed; the obtained mixed solution is poured into a mold, the mold is placed in a uniform magnetic field with the magnetic field direction unchanged, the magnetic particles are arranged into a plurality of chain-shaped aggregates parallel to the magnetic field direction under the action of the magnetic field, and the chain-shaped aggregates are parallel to one another; and after the mixed solution in the mold is completely cured, removing the action of the magnetic field to prepare the optical collimator based on the magnetic particles. Therefore, the technical problems of complex manufacturing process, high cost and difficult maintenance of the light collimator in the prior art are solved.

The invention discloses an air cylinder with a built-in magnetic ring air buffering function, and relates to the technical field of air cylinders. The hydraulic cylinder comprises a cylinder barrel, four pull rods, a rear cylinder seat, a front cylinder seat and a piston rod, the cylinder barrel and the pull rods are fixedly assembled between the rear cylinder seat and the front cylinder seat, and the piston rod is assembled on the cylinder barrel and the front cylinder seat in a sliding mode. Electromagnetic buffer assemblies are arranged on the rear cylinder seat and the front cylinder seat; according to the invention, under the action of the adjusting assembly and the electromagnetic buffer assembly, the distance between the first electromagnetic solenoid coil and the piston rod and the distance between the second electromagnetic solenoid coil and the piston rod are adjusted, and meanwhile, the magnetic field directions of the first electromagnetic solenoid coil and the second electromagnetic solenoid coil are changed through the current directions of the first power supply and the second power supply; the piston rod can rapidly stop moving under the action of electromagnetic force opposite to the moving direction of the piston rod in the moving process, damage caused by impact between the piston rod and the rear cylinder base or the front cylinder base is avoided, the abrasion degree of the piston rod is reduced, and the service life of the air cylinder is prolonged.

The invention provides a magnetic liquid drop and particle collision measurement experiment device based on a computer vision technology, and belongs to the field of particle collision characteristic detection. The problems that in the collision measurement process of the magnetic liquid drops and the particles, external field regulation and control are lacked, and personal errors exist in the image analysis process are solved. The device comprises a magnetic control device, a particle fixing device, a liquid drop emitting device and a data acquisition and processing device, the magnetic control device controls the magnetic field intensity by controlling the magnitude of voltage and current input by a direct-current power supply, and the magnetic field direction is changed by adjusting a magnetic field generator; the particle fixing device fixes particles; the liquid drop emitting device emits magnetic liquid drops; a high-speed camera and a data acquisition instrument in the data acquisition and processing device can acquire and record experimental data and feed back the experimental data to a data processing unit, and a computer vision technology is utilized to carry out dynamic capture and image recognition on the spreading process of the magnetic liquid drops on the surfaces of the particles. The collision process can be accurately controlled, and the collision process is dynamically captured through the computer vision technology.