52 results about "Field intensity" patented technology

The invention belongs to the technical field of photocatalytic water dissociation, and relates to a method for enhancing the photocatalytic oxygen evolution reaction efficiency of a nanorod array material through a magnetic field. According to the invention, ZnO nanorod arrays are placed at three relative positions of a cubic parallel uniform magnetic field with adjustable magnetic field intensity for photocatalytic OER. The constructed magnetic field regulation and control device is mainly composed of two parallel coils which are connected in series. The electromagnetic effect is generated through the coil, and rapid adjustment of the magnetic field is facilitated. And magnetic induction lines between the parallel coils connected in series are uniformly distributed in parallel, so that the direction of a magnetic field can be regulated and controlled. Due to the existence of the magnetic fields which are uniformly distributed in parallel among the parallel coils which are connected in series, photon-generated carriers moving in catalyst particles move in opposite directions under the action of Lorentz force. And photo-generated electrons (e-) and photo-generated holes (h +) are separated, so that the photocatalytic reaction efficiency is improved. Therefore, the magnetic field regulation and control device can meet the regulation and control of catalytic reaction.

The invention discloses a self-adaptive electromagnetic radiation suppression method for equipment in a high-intensity radiation field. The method comprises the following specific steps: establishing an electronic equipment model under external plane wave irradiation; plane wave intensity is set, and field intensity distribution of an inner cavity of the electronic equipment model is obtained; determining shielding electromagnetic effect weak points according to the field intensity distribution of the inner cavity of the electronic equipment model; establishing an energy selection surface structure comprising a plurality of slot resonance patches arranged in an array; the energy selective surface structure is arranged on the surface where the shielding electromagnetic effect weak point is located, and an energy selective surface protection structure model is established; and comparing the field intensity at the shielding electromagnetic effect weak point in the energy selective surface protection structure model with a protection requirement, and judging whether the energy selective surface structure meets the protection requirement or not.

The present invention relates to the field of magnetic field measurement, and provides a medium-high-frequency high-field-intensity alternating magnetic field measurement method based on electromagnetic induction. In the present invention, an alternating induced electromotive force generated by the electromagnetic induction effect of a closed metal coil under the action of an alternating magnetic field is used, a designed probe element is applied to convert an alternating magnetic field parameter into a synchronously-varying electrical signal, and the frequency and amplitude of the electrical signal are measured to characterize the frequency and field intensity of an alternating magnetic field to be measured, thereby broadening the measurable frequency and field intensity range of the alternating magnetic field. In addition, the device in the present invention is highly tolerant to measurement environment requirements, compact, convenient to carry, and easy and convenient to operate.

The invention belongs to the field of insulators, and particularly relates to a porcelain insulator string degradation detection method and system based on radial electric field change, and the method comprises the steps: carrying out the simulation of a three-dimensional electrostatic field model of a porcelain insulator string; obtaining a radial electric field distribution curve of the undegraded porcelain insulator string; obtaining a radial electric field distribution curve when a zero-value insulator exists in the degraded insulator string; comparing the radial electric field distribution curves of the undegraded porcelain insulator string and the degraded porcelain insulator string, and classifying different parts according to a high-voltage end part and a low-voltage end part during comparison; a plurality of simulation comparison data of an undegraded porcelain insulator string and a degraded porcelain insulator string with a zero-value insulator are obtained, a high-voltage end fault or a low-voltage end fault can be distinguished at a time through a radial electric field distribution curve, then the zero-value insulator sheet is positioned through a field intensity difference value, and meanwhile, the zero-value insulator sheet can be accurately positioned. And the degradation degree of the insulator can be analyzed through the field intensity difference value, so that maintenance personnel can know the degradation amplitude of the insulator conveniently, and subsequent maintenance is facilitated.

The invention discloses a three-dimensional magnetic control navigation system which comprises a support, a multi-magnetic-pole device arranged on the support, a pose driving device, a magnetic pole magnetic field control device and a main control device. The main control device is used for outputting an import control signal based on three-dimensional blood vessel path parameters of an operator and a pre-constructed magnetic field control model when receiving an intervention control instruction of a user; the pose driving device is connected with the main control device and is used for driving the multi-magnetic-pole device to change the pose based on the imported control signal, so that the spatial distribution state of a magnetic field generated by the multi-magnetic-pole device is changed; and the magnetic pole magnetic field control device is connected with the main control device and is used for driving one or more single magnetic poles in the multi-magnetic-pole device to change the magnetic field intensity based on the imported control signal. By means of the system, space distribution and field intensity of the magnetic field can be conveniently adjusted, the magnetic guide wire can accurately penetrate through the blood vessel under driving of the magnetic field, manual operation of a doctor is not needed, and therefore interventional therapy can be completed within a short time.

The invention provides a near-electricity risk early warning method and system based on electric field and magnetic field distribution. The method comprises the following steps: acquiring three-dimensional space electromagnetic field data in a target scene every first preset time; preprocessing the three-dimensional space electromagnetic field data, and constructing an electric field distribution model and a magnetic field distribution model according to the preprocessed electric field data and magnetic field data; respectively extracting a field intensity gradient amplitude and an electromagnetic field energy density from the electric field distribution model and the magnetic field distribution model, calculating a risk index of each space point according to the field intensity gradient amplitude and the electromagnetic field energy density, and dividing a risk area according to the risk indexes; and acquiring the current position of the operator, judging whether the current position is in the risk area, and if so, sending out early warning information. According to the method, the near-electricity risk can be comprehensively and accurately evaluated, the accuracy and effectiveness of early warning are improved, and the safety of operators is effectively guaranteed.

The utility model relates to the field of high-voltage electrical equipment, and provides an isolating contact, which comprises a moving contact, a shielding cover and an insulating cylinder, the shielding cover and the insulating cylinder are sleeved outside the moving contact, a screw rod mechanism is arranged in the moving contact, a conductor with high voltage is connected outside the moving contact, the shielding cover is arranged in the insulating cylinder, and the insulating cylinder is arranged in the insulating cylinder. The shielding case comprises a first shielding case, a second shielding case and a third shielding case which are arranged at intervals; the first shielding case is connected with the conductor in a high-voltage mode, the lead screw mechanism drives the moving contact to move towards or away from the second shielding case and the third shielding case, so that the moving contact is connected with the second shielding case and the third shielding case in a high-voltage mode, the field intensity in the air cavity is effectively reduced, partial discharge is reduced, and the compression strength is improved. The gap between the second shielding cover and the first shielding cover and the gap between the second shielding cover and the third shielding cover form a shielding fracture, the function of circuit breaking is achieved, and the electric field can be effectively shielded by setting the reasonable fracture length.

The invention discloses a split winding uniform electric field structure and a using method, and relates to the field of high-voltage transformer insulation design, the uniform electric field structure comprises a low-voltage U-shaped coil, a high-voltage coil and an electrostatic ring, the low-voltage U-shaped coil surrounds the outer side of an iron core in a split mode in the axial direction of the iron core, and the high-voltage coil is wound around the electrostatic ring. The high-voltage coil is arranged on the outer side of the low-voltage U-shaped coil, a hollow part is formed at the split part of the low-voltage U-shaped coil, and the electrostatic ring is arranged at the hollow part. The problem that the maximum field intensity and the average field intensity between the windings cannot be reduced while the insulation distance between the windings is reduced in the prior art can be solved.

This invention provides a safety magnetic field critical point detection device and a method for hierarchical detection of magnetic field distribution. The safety magnetic field critical point detection device includes a base, a pile, a first detection component, a second detection component, and a control component. A walking component is located at the bottom of the base. The pile is located on the upper side of the base and has a warning component. The first detection component is connected to the pile and is used to detect the field strength at the location of the pile. The second detection component is connected to the pile and is adapted to rotate around the pile to detect the field strength around the pile. The control component is electrically connected to the walking component, the first detection component, and the second detection component, and internally stores the critical point field strength. The control component is adapted to control the walking component to move the pile to the critical point field strength based on the field strength detected by the first and second detection components. The hierarchical detection method of magnetic field distribution, based on the above-mentioned safety magnetic field critical point detection device, can realize hierarchical visualization of magnetic field distribution.

There is disclosed a method of vectoring a rocket propulsion system producing a partly ionized exhaust jet along a longitudinal jet axis and through a nozzle. One or more pairs of electrodes may straddle the exhaust jet inside the nozzle or at a nozzle exit. A high-voltage DC supply may energize one or more of the electrode pairs with a strong electric field. A field intensity of the electric field may be scaled by the DC supply to proportionately deflect the exhaust jet away the longitudinal axis by a desired vectoring angle. The particular pair voltages sent to each pair of electrodes by the DC supply may be weighted for establishing a desired azimuth for the deflection. The strong electric field may laterally accelerate positively charged particles in the exhaust jet toward a negatively charged side of the one or more electrode pairs, thereby achieving the desired deflection and azimuth.

The invention discloses an ultra-short bending type beam homogenization structure, which is characterized in that a bending type high-current homogenization substructure and a symmetrical bending type high-current homogenization substructure are realized by using a piece of secondary iron and a plurality of pieces of fourth and eighth composite iron on a beam line; the bent high-current homogenization substructure is used for realizing a bent high-current homogenization beam line; the symmetric bending type high-current homogenization substructure is used for realizing a symmetric bending type high-current homogenization beam line; according to the invention, the problem that the effect of the eight-pole iron cannot be fully exerted because the part with the largest envelope is usually occupied by a four-pole magnetic field when the eight-pole iron is adopted in the prior art is solved; the problems that the field intensity requirement of an eight-pole magnet is very high, the engineering cost is too high and implementation is difficult due to the fact that beam envelopes of the positions where existing eight-pole iron 1 and eight-pole iron 2 are located are small are solved. The problems of more expensive civil engineering, large occupied area and high cost of surrounding shielding caused by overlong beam lines are solved.

A catheter for tissue ablation has one or more electrodes attached to an inner surface of a catheter body facing a lumen, and one or more electrodes attached to an outer surface. The electrode is offset from the distal end of the catheter. The material between the inner electrode and the outer electrode is an insulator and may be, for example, a dielectric having a high dielectric constant. The catheter configuration creates an electric field that bends around the catheter tip. The field intensity near the tip of the catheter is relatively symmetrical; thus, tissue ablation depth is relatively insensitive to catheter orientation. Embodiments may have multiple inner or outer electrodes and may switch the voltage configuration between the electrodes to change the electric field direction over time, thereby improving ablation consistency.

The invention relates to a method and a device for reducing a local thermal load on a surface of a particle collection device that is struck by electrically charged particles. The electrically charged particles may correspond in particular to a fraction of non-neutralised ions from a particle beam of neutralised ions downstream of a neutraliser of a neutral beam injection device of a fusion reactor. The method comprises changing, preferably continuously, the point of impact (P) of the charged particles (8) on the surface (34) by exposing the charged particles (8) to at least one magnetic and / or electric field, the field lines of which are oblique or perpendicular to a flight direction of the charged particles and the field strength of which is varied, preferably continuously, in order to change the point of impact (P) so as to reduce a local thermal load on the surface (34), the surface (34) being designed as an area with an open cross-section.

The invention provides a high-frequency transformer which comprises a magnetic core, a primary winding and a secondary winding, the magnetic core is provided with a frame body and a wrapping post located in the middle of the frame body, the primary winding and the secondary winding are wrapped by an insulation structure, the primary winding is composed of a plurality of first turns which are connected in series, and the secondary winding is composed of a plurality of second turns which are connected in series. The secondary winding is composed of a plurality of second turns which are connected in series, the first turns and the second turns are arranged around the wrapping post in an alternate stacking mode, and the first turns and the second turns are arranged in a staggered mode on the section perpendicular to the winding direction; by arranging the turns of the adjacent layers in a staggered mode, the inter-turn distance can be increased, stray capacitance and field intensity are further reduced, the semi-conductive layer is further arranged outside the insulation structure, the voltage or field intensity of the area is further reduced, and the requirement of the high-frequency transformer is met.

The utility model discloses a magnetic arc suitable for weakly magnetic mineral separation, which comprises a feeding pipe, a rotary drum rotationally arranged relative to the feeding pipe, a fixed magnetic steel component positioned outside the rotary drum, and a fan-shaped collecting hopper positioned in the rotary drum and connected with the feeding pipe. A plurality of water spraying holes are formed in the front surface of the backwashing water pipe; and the water spraying holes are arranged over against the inner wall of the rotary drum. Compared with the prior art, energy is saved, consumption is reduced, discharging of the rotary drum is more convenient and easier, discharging of materials is more complete under the common action of the ore discharging water pipe and the concentrate scraper, a Halbach array is adopted in the magnetic system structure, higher field intensity can be generated, and the Halbach array magnetic system structure can maximize the magnetic field of the permanent magnet. And a higher induced magnetic field is generated. And more energy loss does not need to be provided. A higher magnetic field means that the enrichment rate of magnetic iron in lean ore can be maximized.

A residual film detection and recovery device based on superposition of an electric field and a magnetic field belongs to the field of intelligent agricultural equipment, a detection mechanism of the residual film detection and recovery device integrates an electric field detection part and a magnetic field detection part, an electric field is established through an electric field disc harrow emitting electrode, and preliminary positioning is performed by utilizing field intensity distortion caused by dielectric constant difference between residual films and soil; an alternating magnetic field is excited through the electromagnetic coil in the magnetic field disc harrow, secondary verification is carried out on magnetic field change caused by the blocking effect of the residual film on induced eddy current in soil, and the accuracy and the anti-jamming capability of residual film identification can be remarkably improved through an electric field and magnetic field superposed dual-mode detection mechanism. After detection, the soil loosening mechanism loosens the soil containing the residual films, then the picking and conveying mechanism with bionic spike teeth picks out the residual films and conveys the residual films to the film collecting box, and precise recovery is completed. According to the invention, integrated combined operation of residual film detection, positioning and recovery can be realized, and the problems of blind operation and incomplete recovery of a traditional recovery machine are effectively solved.

The application belongs to the technical field of space gravitational wave detection, and specifically discloses a gravitational effect finite element simulation method based on solving gravitational field partial differential equations, which comprises the following steps: inputting a weak form of the gravitational field partial differential equation in a physical field developer of simulation software COMSOL to construct a gravitational field interface plug-in; importing a spacecraft model into the simulation software COMSOL and constructing a space around the spacecraft; inputting a definite condition in the gravitational field interface plug-in; determining a gravitational potential through mesh partitioning and the gravitational field interface plug-in, and determining the gravitational field intensity of the spacecraft and the surrounding space based on the gravitational potential; and performing an integration operation on the test mass in the spacecraft based on the gravitational field intensity of the spacecraft and the surrounding space to determine the gravity and the gravity torque that the test mass receives. Through the application, the self-gravitational effect calculation process can be effectively simplified, and the gravity that an object with any shape receives can be calculated.

The invention belongs to the technical field of magnetic field testing, and discloses a multi-point portable magnetic field intensity tester, which comprises a plurality of groups of longitudinal detection modules and a plurality of groups of transverse detection modules, the plurality of groups of longitudinal detection modules are arranged in the longitudinal direction inside the magnetic field intensity tester, and the plurality of groups of transverse detection modules are arranged in the transverse direction inside the magnetic field intensity tester. The sensor is used for detecting the transverse magnetic field intensity of the strong magnetic field; the plurality of groups of transverse detection modules are arranged in the transverse direction inside the magnetic field intensity tester and are used for detecting the magnetic field intensity of the strong magnetic field in the longitudinal direction; and each group of longitudinal detection module and each group of transverse detection module respectively comprise two first Hall sensors which are oppositely arranged. According to the invention, magnetic field intensity measurement can be carried out on a plurality of point positions of an effective degaussing area of a high-intensity magnetic field, the plurality of point positions only need to be tested once, the probe does not need to be positioned, a structural member in the degaussing area does not need to be disassembled, professional requirements on an operator are avoided, and the test is simple. The method is very suitable for regular testing of degaussing field intensity by common users with magnetic field intensity monitoring requirements, and ensures degaussing reliability.

The invention discloses an ultrashort linear beam homogenization transmission line. A linear high-current homogenization beam line is sequentially provided with an accelerator outlet, a beam matching mechanism, four-eight-pole composite iron 1, four-eight-pole composite iron 2, a beam homogenization effect observation mechanism and a terminal in the beam direction. The four-and-eight-pole composite iron 1 and the four-and-eight-pole composite iron 2 are used for respectively and simultaneously generating a quadrupole magnetic field and an eight-pole magnetic field, so that the effects of quadrupole iron and eight-pole iron can be simultaneously realized by only installing one transmission element; the four-and-eight-pole composite iron 1 and the four-and-eight-pole composite iron 2 are based on a four-and-eight-pole composite magnet system. According to the invention, the problem that the effect of octopole iron cannot be fully exerted because a place with the largest envelope in the prior art is usually occupied by a quadrupole magnetic field is solved; the problem that the field intensity requirement of the eight-pole magnet is very high and is difficult to realize in engineering due to the fact that the beam envelope at the position of the existing eight-pole iron is relatively small is solved. And the problems of large occupied area and high cost caused by overlong beam line length are solved.

There is disclosed a method of vectoring a rocket propulsion system producing a partly ionized exhaust jet along a longitudinal jet axis and through a nozzle. One or more pairs of electrodes may straddle the exhaust jet inside the nozzle or at a nozzle exit. A high-voltage DC supply may energize one or more of the electrode pairs with a strong electric field. A field intensity of the electric field may be scaled by the DC supply to proportionately deflect the exhaust jet away the longitudinal axis by a desired vectoring angle. The particular pair voltages sent to each pair of electrodes by the DC supply may be weighted for establishing a desired azimuth for the deflection. The strong electric field may laterally accelerate positively charged particles in the exhaust jet toward a negatively charged side of the one or more electrode pairs, thereby achieving the desired deflection and azimuth.

Provided in the present application are an accessory recognition method and apparatus, and a storage medium. The method comprises: when it is detected that a target accessory is located at a preset target position of an electronic apparatus, generating target magnetic-field intensity characterization data on the basis of a magnetic-field intensity measurement element and in response to the magnetic-field intensity of a magnetic assembly in the target accessory; matching the target magnetic-field intensity characterization data with a preset accessory index table; and determining accessory identification information, which corresponds to a magnetic-field intensity characterization data range obtained after matching, to be identification information of the target accessory. By means of implementing the solution of the present application, the magnetic-field intensity of a magnetic assembly in a target accessory is measured to obtain magnetic-field intensity characterization data, and identification information of the target accessory can then be obtained by means of looking up a table on the basis of the magnetic-field intensity characterization data. Therefore, identification information of accessories can be hidden, which is conducive to guaranteeing the security of accessory information; moreover, it is not necessary to provide numerous measurement devices, thereby reducing the space occupied by hardware and facilitating the reduction in the hardware resource cost.

The invention discloses a multi-sensor anti-collision monitoring and alarming method and system for an excavator, and the method comprises the steps: obtaining a real-time pose data stream of an operation arm, the real-time pose data stream of the operation arm comprises millimeter-wave radar data, laser radar point cloud data and ultrasonic echo data, and obtaining a real-time pose data stream of the operation arm based on the real-time pose data stream of the operation arm; constructing a three-dimensional dynamic risk field model, wherein a field intensity distribution rule of the three-dimensional dynamic risk field model comprises the following steps of: maintaining a constant high-field-intensity substrate in a rotary substrate area; a field intensity gradient decreasing area is formed in the extension direction of the operation arm, and the decreasing rate is in positive correlation with the joint angular acceleration; a field intensity peak area is formed at the tail end of the bucket, and the peak position is dynamically matched with the bucket tooth movement track; and converting the millimeter wave radar data into a target approaching velocity vector and azimuth confidence. According to the invention, through dynamic risk field modeling of motion state linkage, multi-source sensing vibration interference suppression and a prediction grading response mechanism, collaborative jump of collision protection precision and real-time performance under complex working conditions is realized.

The invention discloses an automatic switching control method and system for a motor power distribution system, and the method comprises the steps: connecting a normally-closed auxiliary contact of a vacuum circuit breaker into a coupler in series, and triggering an insulation monitoring device to switch a working mode when the state of the contact changes; acquiring electric field intensity distribution and a leakage current path of a motor insulation medium by adopting an insulation monitoring device, constructing an electric field-impedance coupling map, and identifying a field intensity concentration area; performing clustering analysis on the minimum field intensity point to form a dominant node, establishing a candidate path, and selecting a path with the minimum impedance gradient as a switching path; monitoring arc characteristic parameters of the vacuum circuit breaker, extracting arc energy density, converting the arc energy density into magnetic field stored energy, releasing reverse electromotive force, and extracting an attenuation coefficient through buffer voltage to correct a switching position; and an impedance matching window is generated, and a comprehensive switching control instruction is generated and executed in combination with the optimized switching time and the energy recovery coefficient, so that intelligent control of the switching position and time is realized, the arc energy is recovered, and the system safety and economical efficiency are improved.

The invention discloses an electrode needle structure for a static eliminator and a verification method thereof, and belongs to the field of static elimination. A round bar-shaped structure is arranged at the front end of the needle body of the electrode needle; the bottom end of the round bar-shaped structure and the front end of the electrode needle body are connected into a whole through an axial symmetry structure defined by an arc-shaped curved surface or a linear curved surface. And a hemispherical segment structure with the diameter the same as that of the round bar-shaped structure is arranged at the top of the round bar-shaped structure. A round-rod-shaped tip design is adopted, the uniformity of electric field distribution of the tip of an existing spherical segment electrode needle is considered, the structure of the tip after electric corrosion and abrasion is consistent with a round-rod-shaped structure, and then it is guaranteed that the field intensity value of the top of the tip is basically kept to be a constant value within the designed service life; the structure of the tip after electric corrosion and abrasion is consistent with that of a round bar-shaped structure, and the field intensity value of the top of the tip is basically kept as a constant value, so that more stable discharge and ion output within the designed service life are realized. The electrode needle can be widely applied to the field of design and manufacturing of the electrode needle for the electrostatic eliminator.

This disclosure relates to an undulator control method and apparatus, an undulator, and an optical system. The undulator control method includes: maintaining the temperature of a superconducting material section at a temperature greater than or equal to a first preset temperature by a temperature control unit, and generating a background magnetic field with a first preset background field strength by a first magnetic field generating component; maintaining the background field strength of the background magnetic field at the first preset background field strength, and reducing the temperature of the superconducting material section from the first preset temperature to a second preset temperature by the temperature control unit; maintaining the superconducting material section in a superconducting state, and reducing the background field strength from the first preset background field strength to the second preset background field strength by the first magnetic field generating component, so that the superconducting material section generates an undulating magnetic field with a preset undulation field strength; and maintaining the background field strength at the second preset background field strength, and increasing the temperature of the superconducting material section by the temperature control unit to reduce the undulation field strength of the undulation magnetic field until the undulator generates light with a target fundamental wavelength.

The invention provides a substrate temperature monitoring structure and a substrate temperature monitoring method in MBE equipment, the substrate temperature monitoring structure comprises a substrate bearing structure, a measuring structure and a data processing module, the substrate bearing structure comprises a magnetic source part and a bearing part used for bearing a substrate, and the magnetic source part is embedded in a preset position of the bearing part; the measuring structure is fixed in a magnetic field generated by the magnetic source part right above the bearing part, and a preset distance is formed between the measuring structure and the upper surface of the bearing part; the measuring structure comprises a field intensity measuring part and a temperature measuring part fixed on the surface of the field intensity measuring part; the data processing module receives potential difference signals of the two poles of the field intensity measuring part and the temperature measuring part in real time and processes the two received potential difference signals in real time. The magnetic source part is arranged at the center of the bearing part, and the field intensity measuring part for measuring the magnetic field intensity and the temperature measuring part for measuring the temperature of the field intensity measuring part are arranged above the magnetic source part, so that the temperature of the substrate is accurately monitored in real time, and the cost is low.

The invention discloses an irrigation water activating device capable of controlling field intensity, and belongs to the technical field of irrigation water activating equipment, the irrigation water activating device comprises a plurality of magnetic group units, a water blocking telescopic unit, a magnetic group gap adjusting linkage unit and a sealing support unit, the magnetic group units are circumferentially arranged in an inner cavity of the sealing support unit at intervals, and the water blocking telescopic unit is arranged in the sealing support unit; a gap is kept between every two adjacent magnetic resistance units, a water blocking blade is arranged at the inner end of each magnetic group unit, the multiple water blocking blades are stacked in a staggered mode to form a middle sealing structure, and the water blocking telescopic unit is connected between the outer ends of every two adjacent magnetic group units and moves and stretches out and draws back in the radial direction along with the magnetic group units. The magnetic group gap adjusting linkage unit is connected between the magnetic group unit and the sealing support unit. The multiple magnetic group units are arranged at intervals in the circumferential direction, the magnetic group gap adjustment linkage units are used for adjusting the gap size of the adjacent magnetic group units, changing the water flow gap and adjusting the magnetic field distance and field intensity, adjustment is convenient and fast, and the problem that the magnetic field intensity of an existing irrigation water magnetic field activation technology is difficult to adjust is effectively solved.

The invention discloses a double-objective structure, an electron microscope and a using method, and belongs to the field of electron microscopes, first, second and third extension parts are conical, the tail end of the first extension part and the tail end of the third extension part form an opening, the tail end of the second extension part extends into the opening, and in an immersion mode, a second coil, a second pole shoe and a third pole shoe work; the magnetic field leaks to the sample from the second gap, so that the sample is immersed in the magnetic field, the part with the maximum field intensity is positioned between the tail end of the third pole shoe and the sample, an extremely short effective focal length is obtained, and higher resolution is further obtained; in the non-immersion mode, the first coil, the first pole shoe and the second pole shoe work, the magnetic field is limited in the first gap and does not leak to a sample, the maximum field intensity position is located between the tail ends of the first pole shoe and the second pole shoe, under the same working distance, a longer effective focal length is usually achieved, the immersion mode and the non-immersion mode are achieved, and the non-immersion mode can also achieve high resolution. And the current required during high-energy imaging is small, so that high-energy electronic imaging is facilitated.

The invention discloses a pulse magnetic field intensity measurement and calibration system and method based on a Hall sensor. According to the system, a Hall sensor array is used for measuring pulse magnetic field intensity generated by a solenoid under different charging voltages and probe space positions, and multiple groups of voltage-position-magnetic field intensity coupling data are obtained; a three-dimensional mapping relation model of the magnetic field intensity, the space coordinates and the charging voltage is established based on the data, and high-precision quantitative characterization of space magnetic field distribution is achieved; according to the method, the three-dimensional mapping relation model is constructed through the system. According to the method, an accurate magnetic field intensity calibration basis can be provided for the inversion calculation of the particle movement speed time travel curve in an explosion physical experiment, the reliability of the mapping relation between the electromagnetic parameters and the space field intensity and the particle speed inversion precision under the transient explosion condition are remarkably improved, and key data support is provided for explosion driving mechanism research.

The utility model relates to the technical field of food detection, in particular to a small magnetic resonance main magnetic field inserting piece structure which comprises a support used for supporting the whole structure. The magnetic plate comprises a main magnetic plate body and a bundle magnetic plate body, the main magnetic plate body and the bundle magnetic plate body jointly form an insertion piece structure, and a plurality of neodymium-iron-boron permanent magnets are inlaid in the main magnetic plate body. A strong main magnetic field environment can be constructed in a limited space, the field intensity of a main imaging area reaches 165 mT, a high-intensity magnetic field meeting the detection requirement can still be provided for application such as food detection on the premise that the requirement for miniaturization of equipment is met, 36 neodymium iron boron permanent magnets are embedded in each group of main magnetic plates, 26 magnetic blocks are embedded in each bundle magnetic plate, and the magnetic field intensity of each group of main magnetic plates is adjusted. By means of the specific magnet layout mode and the design that the main magnet is arranged in the middle of the beam magnetic plate, the uniformity of the magnetic field of the main imaging area can be improved.