30 results about "Field intensity" patented technology

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.

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.

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.

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.

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.

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 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.

The invention relates to a control circuit (1) for sensing a rotational position of an operating element (30) of an electrically operated hand-held tool, which operating element can be rotated about a fixed axis of rotation (R), the control circuit comprising: two magnetic field sensors (21, 22) for sensing a magnetic field; and a magnet (31) which can be arranged on the operating element (30) and can be rotated from a starting point (11) to an end point (12) along an actuation path (10) or freely along the actuation path (10) about the axis of rotation (R), wherein the magnetic field sensors (21, 22) are offset to one another along the actuation path (10) and are designed to each determine, from its own measured field intensity of the magnetic field of the magnet (31), the rotational position of the magnet (31) about the axis of rotation (R) and / or to each transmit its own measured field intensity of the magnetic field of the magnet (31) to an evaluation device (23) which is designed to determine the rotational position of the magnet (31) about the axis of rotation (R).

The fast-assembly shielding ball comprises a mounting seat, a shielding shell is fixedly mounted at the upper end of the mounting seat, the shielding shell comprises a lower shell, an adjusting shell and an upper shell, the outer surfaces of the lower shell, the adjusting shell and the upper shell are in smooth connection, and a driving bevel gear is fixedly mounted on the inner wall of the adjusting shell; driven bevel gears are evenly and rotatably assembled on the inner wall of the upper shell, adjusting structures are fixedly installed at the inner ends of the driven bevel gears, self-locking structures are assembled at the output ends of the adjusting structures, sliding rail structures are evenly and fixedly installed on the inner wall of the lower shell, and the connecting structures are used for connecting a fitting and a shielding shell. A continuous smooth spherical surface without sharp edges and corners is formed on the outer surface of the shielding shell, after the spherical surface and the high-voltage fitting are equipotential through an internal connection structure, the smooth and continuous surface can homogenize electric field distribution of the surface to the maximum extent, and the maximum electric field intensity of the surface is effectively reduced to be lower than the critical inception field intensity of air; therefore, the generation of corona is inhibited, and the shielding effect is better.

The invention belongs to the technical field of high-voltage probe equipment, and particularly relates to an infiltration type ultrahigh-voltage probe station which comprises a structural base, a test probe seat placing platform and a wafer bearing table moving mechanism installed on the structural base. The wafer infiltrating and bearing mechanism is installed on the wafer bearing table moving mechanism, and the wafer infiltrating and bearing mechanism is used for infiltrating and positioning a wafer to be tested. According to the infiltrating type ultrahigh-voltage probe station, due to the fact that the connection position of the bowl wall and the bottom of the inner cavity of the insulating pressure-resistant outer bowl is in transition through the smooth arc with the large curvature radius instead of a right angle, under the high voltage, an electric field in the area is evenly distributed, field intensity concentration at the sharp corner is avoided, and the infiltrating type ultrahigh-voltage probe station is stable and reliable. The side surface of the high-voltage conductive inner core embedded in the center of the bottom of the insulating and voltage-resistant outer bowl is completely surrounded by the insulating and voltage-resistant outer bowl, so that no metal edge is exposed in insulating and voltage-resistant oil or air.

The application discloses a quick-mounting shielding ball for a converter station fitting, which comprises a mounting seat, a shielding shell fixedly installed at the upper end of the mounting seat, a lower shell, an adjusting shell and an upper shell, wherein the outer surfaces of the lower shell, the adjusting shell and the upper shell are smoothly connected, a driving bevel gear is fixedly installed on the inner wall of the adjusting shell, a driven bevel gear is uniformly rotationally assembled on the inner wall of the upper shell, an adjusting structure is fixedly installed on the inner end of the driven bevel gear, a self-locking structure is assembled on the output end of the adjusting structure, a sliding rail structure is uniformly fixedly installed on the inner wall of the lower shell, and a connecting structure is used for connecting the fitting and the shielding shell. In the application, the outer surface of the shielding shell forms a smooth spherical surface without sharp edges and corners. When the spherical surface is in equipotential with the high-voltage fitting through the internal connecting structure, the smooth and continuous surface can maximize the homogenization of the electric field distribution on the surface, effectively reduce the maximum electric field intensity on the surface to below the critical corona onset field intensity of air, thereby inhibiting the generation of corona, and the shielding effect is better.

According to the power MOSFET layout and the MOSFET provided by the embodiment of the utility model, no contact hole region is arranged between the first trench region and the second trench region. Therefore, the breakdown voltage of the shielding grid power MOSFET can be improved, and the field intensity / collision ionization rate of the bottom of the groove of the MOSFET terminal region provided by the embodiment of the invention is reduced.

The invention discloses a method and a system for automatically setting inspection point positions of a transformer substation. The method comprises the following steps: constructing a current field distribution diagram, a thermal radiation field distribution diagram and a vibration energy field distribution diagram; performing cascade modulation on the three field graphs based on a physical causal chain to generate a composite gravitational field distribution graph; taking the inspection starting point as a starting point, tracking the field intensity peak point by point by adopting a gradient rising method, and generating a first inspection path; identifying a field intensity mutation coefficient of an equipment node on the first inspection path, and marking a to-be-detected node; using the to-be-detected node as a center, using an equipotential line gradient tracking rule to identify a field intensity local extreme point, and generating a second patrol path; fusing the first patrol path and the second patrol path to generate a final patrol path; and according to the path point coordinates of the final patrol path, determining a final layout area of the patrol point positions. The system can respond to the real-time operation state of the equipment, achieves the dynamic and precise setting of the inspection point, and remarkably improves the intelligent level and operation and maintenance efficiency of the inspection of the transformer substation.

The application relates to a power distribution shelter control method and system for a high-altitude environment, a terminal and a medium, and relates to the technical field of power distribution shelters. The method comprises the following steps: acquiring air pressure information and temperature information in a power distribution shelter, and calculating an air density parameter based on the air pressure information and the temperature information; correcting a breakdown voltage threshold value according to the air density parameter to obtain a corrected breakdown voltage; acquiring a working voltage of a key high-voltage unit in the power distribution shelter, and calculating a safety margin of the working voltage and the corrected breakdown voltage; if the safety margin is lower than a preset margin margin threshold value, reducing a power distribution bus voltage to a safety operation voltage range matched with the safety margin, and reducing a voltage of a preset non-key load unit; acquiring a field intensity distribution of the key high-voltage unit; if there is a low margin area less than a preset lower limit margin, performing a field intensity suppression operation on the low margin area according to a preset field intensity suppression method. The application has the effect of reducing the probability of breakdown of the power distribution shelter.

The invention relates to a Halbach array-based magnetic field enhanced water electrolysis hydrogen production method and system, and belongs to the technical field of water electrolysis hydrogen production. The method solves the technical problems that bubbles are accumulated due to stress concentration of a square alkaline electrolytic cell, and the electrolytic efficiency is limited due to the fact that the number of magnets is large, magnetic field intensity is weak and distribution is uneven in a traditional magnetic field auxiliary technology. According to the technical scheme, a high-field-intensity uniform single-direction magnetic field is constructed by integrating a Halbach permanent magnet array in an end plate and a bipolar plate of an electrolytic bath, and bubbles are promoted to be stripped from the surface of an electrode by utilizing a Lorentz force and a magnetohydrodynamic effect generated by interaction of the magnetic field and electrolytic current; and meanwhile, the corrosion resistance is improved by combining a nonmetal electrolytic cell structure such as a glass fiber reinforced epoxy resin pole frame and a graphite lining. The method has the beneficial effects that the bubble desorption capacity is remarkably enhanced, the mass transfer process is improved, the hydrogen evolution and oxygen evolution reaction rate is increased, and therefore the electrolysis efficiency is improved.

The application discloses a kind of ultra-short linear beam homogenization transmission line, the linear type high-current homogenization beam line is sequentially provided with: accelerator exit, beam matching mechanism, four eight-pole composite iron 1, four eight-pole composite iron 2, beam homogenization effect observation mechanism, terminal along the beam direction;The four eight-pole composite iron 1 and four eight-pole composite iron 2 are used to generate four-pole magnetic field and octupole magnetic field respectively, so that only one transmission element can realize the role of four-pole iron and eight-pole iron simultaneously;The four eight-pole composite iron 1 and four eight-pole composite iron 2 are based on a four eight-pole composite magnet system.The application solves the problem that the place where the envelope of the prior art is maximum is usually occupied by four-pole magnetic field, and the role of eight-pole iron cannot be fully played;Solve the problem that the beam envelope is small at the position of the existing eight-pole iron, which makes the field intensity requirement of eight-level magnet very high and difficult to realize in engineering;Solve the problem that the length of beam line is too long, resulting in large floor area and high cost.

The invention relates to the technical field of gold nanomaterials, in particular to a cup-rod structure gold nanomaterial and a preparation method and application thereof. The gold nanomaterial comprises a super-long gold nanorod with a gold nanocup cavity structure at one end and / or a super-long gold nanorod with gold nanocup cavity structures at two ends, and a nano gap formed between a cup-shaped cavity growing at one end and / or two ends of the super-long gold nanorod and the super-long gold nanorod can promote strong plasmon coupling. The light absorption capacity and the near-field intensity of the cup-rod structure gold nano material are obviously improved; the asymmetric gold nanocup has magnetic plasmon resonance, the asymmetric gold nanocup is combined with the ultra-long gold nanorod, so that the asymmetry of the prepared cup-rod structure is greatly enhanced, the local electromagnetic field of the whole structure is remarkably enhanced, and especially the hot spot where the gold nanocup and the gold nanorod are combined has excellent SHG optical performance.

The invention discloses a zero detection method and system based on electric field intensity and insulator string attributes, and a medium, and relates to the technical field of electrical detection, and the method comprises the steps: obtaining electric field intensity information and attribute information of a target insulator string; determining a voltage propagation constant based on the attribute information; substituting the attribute information and the voltage propagation constant of the target insulator string into a constructed expected field intensity distribution model to obtain expected electric field intensity information; comparing the electric field intensity information with expected electric field intensity information to detect a zero-value insulator; by establishing an expected electric field distribution model based on insulator string attributes such as insulator string types, the number of insulator strings, voltage classes and installation modes, electric field distribution in a normal state can be reflected more accurately, so that abnormity can be identified more accurately; meanwhile, in the process of comparing the electric field intensity information with the expected electric field intensity information, the influence of the zero-value insulator on the neighborhood is considered through position correlation analysis, and the detection accuracy is further improved.

The utility model relates to a light splitting type wavefront sensing device, system and measuring equipment, comprising a spectroscope, a field intensity imaging device, a microlens array and a phase imaging device, incident light is divided into two emergent directions by the spectroscope, the field intensity imaging device and the microlens array are respectively arranged in the two emergent directions of the spectroscope, and the phase imaging device is arranged on the spectroscope. The phase imaging device is arranged on the side, away from the spectroscope, of the microlens array. According to the utility model, the spectroscope is arranged, the incident light is divided into two parts through the spectroscope, the field intensity and the phase are measured at the same time through the field intensity imaging device and the phase imaging device in one-time sampling, and the whole sensor assembly is simple in structure and convenient to use.

The utility model relates to the technical field of high-voltage or large-current switches with arc extinguishing or arc preventing devices, in particular to a moving arc contact, a moving arc contact assembly and an isolating switch. The moving arc contact of the utility model comprises an annular main body. The outer contour of the inner side face, the front side face and the outer side face of the annular body sequentially comprises an inner side inclined section located on the inner side face and inclined from inside to outside in the radial direction, an inner edge arc section located at the connecting position of the inner side face and the front side face, a front end linear section located on the front side face and an extension arc section extending from the front side face to the outer side face in a transition mode from inside to outside. The shape of the outer contour meets the conditions that the maximum value of the field intensity at the inner edge arc section is not larger than 25 kV / mm, and the difference value between the maximum value of the field intensity at the extension arc section and the maximum value of the field intensity at the inner edge arc section is not smaller than 1.5 kV / mm. According to the utility model, the difference value between the maximum value of the field intensity at the extension arc section and the maximum value of the field intensity at the inner edge arc section of the moving arc contact is not less than 1.5 kV / mm, and the arc is concentrated in the central area of the moving arc contact, so that the arc is prevented from floating outwards.

The invention relates to the technical field of marine surveying and mapping, investigation and detection, in particular to a magnetic anomaly target object burial depth inversion method based on extreme value information of a single sensor, which comprises the following steps: establishing a marine surveying and mapping space rectangular coordinate system; calculating the induced magnetization intensity formed by the point magnetic source under the action of the geomagnetic field and the gravitational potential generated at the observation point, and establishing the relationship between the magnetic potential and the gravitational potential based on the Poisson equation of the gravity-magnetic potential field; the corresponding relation between the magnetic field intensity and the magnetic potential is deduced by combining the electromagnetism principle, the geomagnetic inclination angle and the magnetic declination angle, and an underwater point magnetic source magnetic anomaly calculation model is constructed by using the total magnetic field intensity actually measured by a magnetometer and the normal geomagnetic field intensity; and extracting a maximum value and a minimum value in the magnetic anomaly, performing specific value operation, solving a vertical distance from the point magnetic source to the observation plane, and calculating the burial depth of the underwater target object through a geometrical relationship. The method is suitable for a detection scene of a ferromagnetic target object with a sandy substrate or a small scale.

The embodiment of the application discloses a heat flow field synergic regulation method and device based on gallium oxide crystal growth, equipment and medium, belongs to the crystal growth regulation technical field, solves the problem that the coupling instability of the heat field and the flow field restricts the growth quality and the yield of gallium oxide single crystal in the actual growth process of the gallium oxide flux method crystal. Including, the temperature field distribution and the convection velocity field of the melt free surface are monitored in real time;Based on the temperature field distribution and the convection velocity field, the corresponding temperature hot spot area and harmful turbulent vortex area when the solid-liquid interface is unstable are determined;According to the temperature gradient corresponding to the temperature hot spot area, the rotation direction corresponding to the harmful turbulent vortex area, and the field intensity information and the local supersaturation gradient information, the dynamic ratio between the temperature compensation amplitude and the magnetic field strength is determined, and the dynamic ratio is corrected;Based on the corrected dynamic ratio, temperature compensation and magnetic field compensation are carried out in the solid-liquid interface instability area, and the synergic regulation of the heat field and the flow field is realized.