20 results about "Field intensity" patented technology

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.

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 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 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 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 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.