228 results about "Magnetic field shielding" patented technology

The invention relates to a composite electromagnetic shielding structure for a power terminal and a preparation method thereof, the structure comprises an accommodating shell, the accommodating shell is formed by connecting a plurality of composite electromagnetic shielding plates, and each composite electromagnetic shielding plate comprises an inner surface shielding layer and an outer surface shielding layer which are attached to each other; a heat conduction layer is arranged between the inner surface shielding layer and the outer surface shielding layer, and the inner surface shielding layer is located in the accommodating shell; a protective layer is arranged on the outer layer of the outer surface shielding layer and comprises an insulating layer and a waterproof layer, and the waterproof layer is located on the outer layer of the insulating layer; the outer surface shielding layer is made of a low-frequency electromagnetic field shielding material formed by mixing amorphous magnetic alloy powder, magnetic fibers and nickel powder; and the inner surface shielding layer is made of a high-frequency electromagnetic shielding material formed by mixing silicon carbide and resin foam rubber fibers. The structure can cope with various electromagnetic interference environments, provides electromagnetic shielding protection, and also has better electromagnetic shielding effectiveness for electromagnetic interference of different frequency bands.

The invention provides a cement-based material residual magnetism intensity detection device, a detection method and an evaluation method. The cement-based material residual magnetism intensity detection device comprises a magnetic shielding cylinder, a fluxgate magnetometer and a test tool, the magnetic shielding cylinder is used for shielding a magnetic field to ensure stable test environment magnetic field; the fluxgate magnetometer comprises a fluxgate probe and a fluxgate digital display meter, the fluxgate probe is used for measuring a vector value of space magnetic induction intensity at a position corresponding to the fluxgate probe, and the fluxgate digital display meter is used for displaying a residual magnetism intensity measured value measured by the fluxgate probe; the test tool is arranged in the magnetic shielding cylinder and is used for placing a sample to be tested and fixing a fluxgate probe; according to the invention, a fluxgate magnetometer and a magnetic shielding cylinder are adopted to detect the residual magnetism intensity of the cement-based material, a standardized detection process and a test method are provided for solid components, a liquid mixture and a molded test block, and quantitative characterization of the distribution rule of the residual magnetism intensity of the cement-based material is realized through fewer detection points.

The utility model discloses a wafer carrying table assembly, which comprises a wafer carrying table, a heating sheet and a shielding sheet, the wafer carrying table is provided with an adsorption hole for adsorbing a wafer, the heating sheet is arranged below the wafer carrying table, the shielding sheet is arranged above the heating sheet, the shielding sheet can conduct electricity, and the shielding sheet can shield a magnetic field generated by the heating sheet and shield electromagnetic noise. And the influence of a magnetic field generated by the heating sheet on subsequent wafer processing procedures is avoided.

The invention relates to the technical field of monitoring equipment, and particularly discloses anti-interference monitoring equipment for electric power information communication, which comprises a fixed plate, protective shells are rotatably mounted at two ends of the side surface of the fixed plate, and the opposite surfaces of the two protective shells abut against each other. Mounting holes are formed in the corners of the sides, away from the opposite faces, of the ends, close to the fixing plate, of the two protective shells, connecting holes are formed in the inner walls of the mounting holes in the length direction, the mounting holes communicate with the interiors of the protective shells through the connecting holes, and mounting shafts are rotationally mounted on the inner walls of the ends, away from the fixing plate, of the mounting holes; shielding cloth is wound on the outer wall of the mounting shaft, one end of the shielding cloth penetrates through the connecting hole and is provided with a connecting plate, the connecting plate abuts against the inner wall of the protective shell, and a limiting groove is formed in the side face of the connecting plate in the length direction. The limiting plate drives the plurality of shielding cloths to perform protection and magnetic field shielding on the circuit board.

An electromagnetic wave- and magnetic field-absorbing-and-shielding sheet according to an exemplary embodiment of the present invention is implemented by comprising: an electromagnetic wave- and magnetic field-absorbing-and-shielding unit having a plurality of magnetic layers stacked to shield electromagnetic waves and magnetic fields; and an electromagnetic wave-absorbing adhesive member, which is arranged between the adjacent magnetic layers to absorb electromagnetic waves that have transmitted the magnetic layers or are reflected from the magnetic layers, and fixes the adjacent magnetic layers. Accordingly, together with an electromagnetic wave- and magnetic field-shielding function, the present invention has a function of enabling most of the electromagnetic waves reflected during shielding to be absorbed to minimize influence on surrounding electronic components, electronic devices, or a user of the electronic devices, caused by electromagnetic waves reflected during shielding and the magnetic field shielding, and thus can be widely applied to various electronic devices and the like.

According to the self-shielding type anti-interference current transformer and the dynamic magnetic field compensation method thereof, external interference magnetic field data are detected in real time through the magnetic field sensing layer, a basis is provided for interference shielding of a magnetic field, reverse magnetic field data are set based on the external interference magnetic field data, a main shielding winding generates a reverse magnetic field, the reverse magnetic field and an interference magnetic field are superposed and offset, and the self-shielding type anti-interference current transformer is obtained. Auxiliary magnetic field data are set for further magnetic field shielding through the residual suppression layer based on the offset condition of reverse magnetic field data on external interference magnetic field data, the auxiliary shielding winding further eliminates high-frequency residual interference, finally 0-20 kHz broadband interference suppression is achieved, performance stability can be kept within the temperature range of-40 DEG C to 120 DEG C, three dynamic shielding layers are adopted, and the performance stability is improved. The problem of dynamic interference in a complex electromagnetic environment is solved, and the measurement precision is improved to 0.1%.

The invention discloses an unmanned aerial vehicle with an electromagnetic protection device for power transmission line operation inspection, and relates to the technical field of unmanned aerial vehicles, the unmanned aerial vehicle comprises a vehicle body, four support arms are mounted on the vehicle body, rotors are mounted on the support arms, a shielding shell is further mounted on the vehicle body, and heat dissipation holes are formed in the upper and lower shell surfaces of the shielding shell respectively; a shielding adjusting mechanism is installed in the shielding shell, the machine body is further provided with a heat dissipation mechanism used for conducting heat dissipation on the shielding shell, and the lower end of the machine body is further provided with a photographing mechanism used for operation and inspection. The magnetic field shielding capability of the shielding shell on the electronic device is adjusted through the shielding adjusting mechanism, so that the electronic device can safely operate in a strong magnetic field; and the shielding shell is fully cooled through the heat dissipation mechanism, so that the safe operation environment of the electronic device is ensured.

The invention relates to the technical field of radioactive medical instrument vacuum, and discloses a vacuum system for a compact high-intensity magnetic field ion generation device, which comprises an ion generation device, a plurality of molecular pumps with magnetic field shielding covers, a plurality of low-temperature pumps, a mechanical pump set, a roots pump set, a plurality of pneumatic gate valves, a plurality of pneumatic baffle valves and a plurality of first resistance gauges, the vacuum control device is connected with the molecular pump, the low-temperature pump, the mechanical pump set, the roots pump set, the pneumatic gate valve, the pneumatic baffle valve, the first resistance gauges and the second resistance gauges and used for controlling the molecular pump, the low-temperature pump, the mechanical pump set, the roots pump set, the pneumatic gate valve and the pneumatic baffle valve according to the vacuum degree. And vacuumizing the ion generating device to the target vacuum degree. Therefore, a vacuum system of the accelerator can be prevented from being polluted, a higher ultimate vacuum effect can be achieved by increasing the water vapor and hydrogen extraction capacity, and the accelerator can operate in a high-intensity magnetic field environment.

The embodiment of the utility model discloses an electromagnetic ultrasonic thickness gauge probe and a thickness gauge, relates to the technical field of size measuring equipment, and is better in flexibility and convenient to be wound and assembled in a manner of adapting to the shape of a magnet. Comprising a housing having an accommodating cavity; the magnet is embedded in the accommodating cavity; the magnetic field shielding layer is located at the bottom of the magnet, the magnetic field shielding layer comprises a flexible printed circuit board of a multi-layer structure, and each of at least two layers in the flexible printed circuit board of the multi-layer structure is provided with a copper-clad layer; and the magnet exciting coil is positioned below the magnetic field shielding layer.

An electromagnetic shielding and heat-conducting multi-layer material and a preparation method thereof. The multi-layer material includes an electric field shielding layer, an epoxy heat-conducting adhesive layer, and a magnetic field shielding layer. The electric field shielding layer includes a copper foil layer with a thickness of 5-12 μm. The magnetic field shielding layer has a thickness of 1-3 mm and includes a resin matrix A and carbon fiber cloth. By weight, the resin matrix A includes: 100 parts of bismaleimide resin, 60-68 parts of 3,3-diallylbisphenol A, 32-40 parts of triallyl isocyanurate, 18-20 parts of N,N-dimethylformamide, 100-160 parts of magnetic field shielding filler, 8-10 parts of di-sec-octyl phthalate, and 0.3-0.8 parts of cobalt naphthenate. The magnetic field shielding filler is compounded by nano-manganese zinc ferrite and micron nickel powder in a mass ratio of (80-120):(30-40). The electromagnetic shielding and heat-conducting multi-layer material of the present invention has both electric field and magnetic field shielding functions and is particularly suitable for high magnetic field and high electric field application environments.

The invention relates to an intelligent magnetic shielding barrel in the field of magnetic field shielding equipment, which is characterized in that a plurality of layers of shielding barrels are demagnetized synchronously through a demagnetizing coil which is arranged in the magnetic shielding barrel and is wound on the plurality of layers of shielding barrels, and the plurality of layers of shielding barrels are demagnetized synchronously through a hinge with an electric bolt, a bolt button and a demagnetizing button. Rapid sealing and locking and one-key demagnetization of the magnetic shielding barrel are achieved, operation is convenient, misoperation of personnel is reduced, an operator is reminded of the current state of the magnetic shielding barrel through a state indicating plate, and the misoperation possibility is further reduced; in addition, the current sensor is used for monitoring the current flowing through the degaussing coil in real time, faults such as short circuit or electric leakage can be found in time, and the operation safety is further improved; besides, through the magnetometer which is arranged in the shielding tube and can extend out, the residual magnetic field intensity after demagnetization is detected, and the demagnetization operation of increasing the power step by step is carried out for multiple times according to needs, so that the automatic demagnetization operation is realized.

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

Disclosed in the present invention is a thermal / magnetic shielding composite structure for a flexible Hall type force sensor, which is constituted by an outer thermal-insulation functional layer and an inner low-frequency magnetic field shielding functional layer. The outer thermal-insulation functional layer is formed by combining three composite material layers, which are successively, from outside to inside, a flexible thermal-insulation composite material layer, a flexible high-frequency magnetic field shielding and cooling composite material layer and a flexible thermal-insulation composite material layer; the inner low-frequency magnetic field shielding functional layer is a flexible low-frequency magnetic field shielding composite material layer. The thermal / magnetic shielding composite structure provided by the present invention can effectively shield both thermal interference and broadband magnetic field interference so as to ameliorate the problem of interference in the use of flexible Hall type force sensors, and has excellent elasticity and flexibility, being suitable for manufacturing elastic sensitive elements of different structures and dimensions.

The invention belongs to the technical field of magnetic field shielding, and discloses an electromagnetic wave absorbing material and device. The electromagnetic wave absorbing material provided by the invention comprises a first skin glass fiber reinforced plastic, a core layer medium, an impedance metamaterial, a second skin glass fiber reinforced plastic and a reflecting layer which are sequentially arranged from top to bottom, the impedance metamaterial comprises a dielectric film and two hollowed-out surface impedance metamaterial layers with different periodic structures, wherein the two hollowed-out surface impedance metamaterial layers are located on the front face and the back face of the dielectric film. The electromagnetic wave absorbing device provided by the invention comprises the electromagnetic wave absorbing material. The high-strength wave-absorbing material has high structural strength and also has relatively good wave-absorbing performance.

The application discloses a kind of armored double-layer shielded dry reed relay and its manufacturing method.The dry reed relay includes dry reed tube, inner shield tube, coil framework, coil, outer shield shell, coil lead, shield lead, side plate, sealing assembly and switch lead.The armored double-layer shielded structure of the above-mentioned dry reed relay can solve the problem of dry reed tube contact characteristic impedance matching uniformity by means of inner layer shielding, solve the problem of relay coil magnetic field leakage and low-frequency electromagnetic field shielding by means of outer layer shielding, and realize the problem of relay structure complete shielding and distributed parameter uniformity by means of coaxial structure.

Provided is a magnetic field shielding module for an electric vehicle. The magnetic field shielding module for an electric vehicle according to an embodiment of the present invention is utilized in a wireless power transmission module for an electric vehicle, and comprises: a shielding layer including a plurality of unit blocks which are made of ferrite materials so as to be able to block a magnetic field generated from a flat coil in which a conductive member is wound multiple times; and a coil accommodation groove recessed to a certain depth from one surface of the shielding layer so as to be able to accommodate the thickness of the flat coil. The shielding layer is formed in a plate shape having a certain area by arranging the plurality of unit blocks adjacent to each other.

According to various embodiments of the present disclosure, an electronic device may include: a display; a coil; a magnet assembly including a plurality of first magnets disposed to surround the coil and a plurality of second magnets disposed to surround the plurality of first magnets at positions spaced apart from the plurality of first magnets by a predetermined distance; a first magnetic field shielding sheet extending along the magnet assembly in a direction toward the display and attached to the magnet assembly; a second magnetic field shielding sheet disposed between the coil and the display in a direction from the first magnetic field shielding sheet toward the display; and a third magnetic field shielding sheet disposed between the display and the second magnetic field shielding sheet. Various embodiments may be possible in addition to the various embodiments disclosed in this document.

The present invention discloses a Pitt-level magnetic field detection sensor, including a magnetic field system and a sensing system, wherein the sensing system includes a magnetic sensitive part, a signal processing part and a shell part, wherein the magnetic field system is a Pitt magnetic field signal, wherein the magnetic field system is connected to the magnetic sensitive part in the sensing system, wherein the magnetic sensitive part is connected to the signal processing part, and wherein the shell part is located outside the magnetic sensitive part and the signal processing part. The present invention adopts the above-mentioned Pitt-level magnetic field detection sensor, and since the TMR sensor measures the magnetic field of the space, the installation of the TMR sensor does not need to be connected to the working circuit of the lightning arrester, and only needs to be installed close to the grounding bus, and the modulation and secondary demodulation methods are used, which is conducive to the detection of extremely weak magnetic field signals, and the use of multilayer Permalloy as a magnetic field shielding material, and the provision of a shell magnetic field shielding is conducive to the Pitt-level magnetic field measurement.

1. The name of this design product: Thermocouple (K-type thermocouple with magnetic field shielding function). 2. Purpose of this design product: Used in electromagnetic induction heating conditions. To address the defects of thermocouples, such as being easily heated by induction and disturbed by magnetic fields, a thermocouple with magnetic field shielding function was developed. 3. The key point of the design of this product lies in its shape. 4. The picture or photo that best illustrates the design points: three-dimensional picture.

This utility model discloses a modular stacked electrical component, belonging to the field of electrical component technology. It includes a housing, a perforated fixing strip welded to the inner surface of the housing, a side support strip on the upper surface of the perforated fixing strip, an internal hexagon screw on the inner surface of the side support strip, a movably latching plate on the outer surface of the internal hexagon screw, a magnetic field shielding mesh fixedly connected to the outer surface of the latching plate, a deformable rubber fixedly connected to the outer surface of the magnetic field shielding mesh, and a fixing block fixedly connected to the outer surface of the deformable rubber away from the latching plate. One side of the electrical component is supported by the perforated fixing strip and connected to the side support strip via the internal hexagon screw, completing the bottom support. The protruding end of the internal hexagon screw is fixed by the latching plate. The deformable rubber, through deformation and bending, correspondingly drives the magnetic field shielding mesh support. The magnetic field shielding mesh wraps around the electrical equipment, completing electromagnetic shielding. The fixing block is fixed by being latched in an inclined groove and by deforming outwards to latch onto the inner surface of the inclined groove.

The utility model relates to a magnetic field shielding assembly, a security check door plate and a security check door, which comprise a magnetic field shielding layer and a first coil layer, one surface of the magnetic field shielding layer is a reflecting surface, and the reflecting surface and the first coil layer are oppositely arranged. The projection of the first coil layer on the reflecting surface is located in the reflecting surface and is spaced from the edge of the reflecting surface.

A device fixing seat that is convenient for disassembly and assembly, including a base. A first chamber, a second chamber, and a third chamber are provided on the base. A driving device is provided in the third chamber. A first actuating device, a first flexible magnetic field shielding cover, and a first magnet are provided in the first chamber. A second actuating device, a second flexible magnetic field shielding cover, and a second magnet are provided in the second chamber. The driving device can simultaneously drive the first actuating device and the second actuating device to stretch and compress the first flexible magnetic field shielding cover and the second flexible magnetic field shielding cover respectively, so as to surround or expose the first magnet and the second magnet, shield or expose the magnetic field of the magnets, thereby generating non-attraction or attraction to the steel plate below, and further facilitating the disassembly and installation of the fixing seat, which is convenient to use.

The application discloses a small animal independent ventilation non-magnetic cage feeding system for indoor air intake and exhaust in a sub-magnetic space, which comprises the following parts: an external magnetic field shielding room, a small animal feeding non-magnetic cage, a non-magnetic cage placing rack, a ventilation unit and an air purification unit and the like; the external magnetic field shielding room mainly shields the external geomagnetic field and provides a required sub-magnetic environment for small animal cultivation; the non-magnetic cage placing rack is mainly used for placing the small animal feeding non-magnetic cage and is equipped with independent ventilation pipelines required for small animal feeding and is also made of non-magnetic materials; the non-magnetic feeding system for small animal cultivation in the sub-magnetic space disclosed in the application is mainly used for in-depth research on the influence mechanism of the sub-magnetic field environment on living beings, so as to further improve the survival rate and life quality of astronauts in future space exploration and interstellar travel.

There is provided a performance testing and evaluation method for a permalloy material for construction of a magnetically-shielded room and relates to testing and evaluation on alloy shielding performance. The present disclosure aims to solve the problem of failure to satisfy the requirements of different application scenarios for the magnetic field shielding due to lack of in-depth research on the shielding effect of the current permalloy in the magnetically-shielded rooms. The method includes: at step 1, selecting a permalloy sample, and conducting quality inspection on the sample to ensure the sample is compliance with an experiment requirement; at step 2, setting up an experimental apparatus; where the permalloy sample is vertically placed, and a magnetic field generation coil and a magnetic field measuring sensor are respectively placed at left and right sides of the permalloy sample; at step 3, carrying out shielding performance testing and evaluation on the permalloy sample.

The invention discloses a double-excitation double-electrode electromagnetic flowmeter for high-frequency pulsating fluid measurement. The double-excitation double-electrode electromagnetic flowmeter comprises a pipe body structure and a control circuit. The pipe body structure comprises a lining and a guide pipe; the inner side face of the guide pipe is covered with a lining. A first group and a second group of electrodes are arranged in the conduit; a first group and a second group of coils are arranged at corresponding positions of the first group and the second group of electrodes in the inner cavity of the catheter; first and second magnetic field shielding covers sleeve the circumferential outer side of the conduit; the first and second groups of coils are respectively positioned inside the first and second magnetic field shielding covers; an annular grounding electrode is arranged between the first group of electrodes and the second group of electrodes; the annular grounding electrode is connected to the conduit through the grounding fastening electrode; the control circuit comprises a CPU module; the CPU module generates complementary periodic excitation waveforms to excite the coil, controls acquisition of electrode signals and is used for calculating flow data of fluid in the conduit. According to the invention, high-fidelity and continuous measurement of the flow of the high-frequency pulsating fluid can be realized, and the measurement precision is ensured.

To improve the accuracy of measuring the electric current flowing through a conductor. [Solution] A current measurement system comprising a magnetic field shield 3 configured to take in the magnetic field H generated by the current I flowing through the cable 9, a magnetic field sensor 4 installed inside the magnetic field shield 3, a predetermined sensor, and a current measuring device, wherein the predetermined sensor is a sensor for detecting the cable 9, the magnetic field sensor 4 detects the magnetic field H at the installation location, and the current measuring device acquires the detection result of the predetermined sensor and the detection result of the magnetic field sensor 4, identifies the center position of the cable 9 based on the acquired detection result of the predetermined sensor, and calculates the current value of the current I flowing through the cable 9 based on the identified center position and the acquired detection result of the magnetic field sensor 4.

The utility model discloses a field geomagnetic observation device which comprises an adjustable support, a bottom supporting mechanism, a solar power generation mechanism, a control box and a sensing box. According to the field geomagnetic observation equipment, the fluxgate sensor and the magnetic induction type magnetic sensor on the sensing box are utilized to realize geomagnetic detection in a field environment; the adjustable support is supported and positioned by using the bottom supporting mechanism, the installation stability of the observation equipment is ensured during field installation, the observation equipment is simply and conveniently positioned and installed in the field, observation points are conveniently added on an original geomagnetic induction observation system, and the observation efficiency is improved. The mounting mode of the bottom supporting mechanism enables the bottom supporting mechanism to be detachable, the occupied space is reduced, and storage and transportation are facilitated; the magnetic field shielding cover is used for shielding a magnetic field, so that an electromagnetic field generated by components in the control box is prevented from influencing the fluxgate sensor and the magnetic induction type magnetic sensor on the sensing box, and the detection accuracy is improved.

The invention discloses a core orientator for paleomagnetism research, and belongs to the technical field of paleomagnetism core measurement. Comprising a hollow column, a magnetic field shielding assembly, an automatic leveling and inclination measuring assembly, an inclination angle measuring assembly, a sun compass and sun angle measuring assembly, a data acquisition and storage assembly, an automatic ink-jet marking assembly and a matched software system which work cooperatively. All the components are sequentially assembled in a layered mode, and an automatic closed loop of insertion, leveling, measurement, verification, recording, marking and transmission is formed. By adopting the core orientator for the paleomagnetic research, manual operation steps can be greatly reduced, personal errors and magnetic interference are avoided, the measurement precision and data consistency are improved, the core orientation working efficiency is remarkably improved, the measurement result is more reliable, sample correspondence is clear, and later informatization management is convenient to trace.

An electronic device includes a display panel including a first area, a bending area at which the display panel is bent, a second area overlapping the first area, first electrodes arranged in a first direction in the first area, second electrodes arranged in a second direction in the first area, and crossing the first electrodes, and third electrodes in the first area, and overlapping with the first electrodes, a circuit board coupled to the display panel at the second area, and including connection lines arranged in the first direction, and respectively electrically connected to the third electrodes, a metal lower sheet between the display panel and the circuit board, a first magnetic-field-shielding layer between the third electrodes and the metal lower sheet, and a second magnetic-field-shielding layer between the connection lines of the circuit board and the metal lower sheet.

A magnetic resonance-compatible programmable synchronized photostimulation system includes a main control unit and a stimulation execution unit. The main control unit is located outside the magnetic resonance scanning room, while the stimulation execution unit is located inside the scanning room and consists only of an LED light panel shielded by a magnetic field. The main control unit is configured to: receive photostimulation sequence parameters configured by the user in a modular manner through a graphical interface; receive a scan trigger signal from the magnetic resonance equipment, and automatically control the start and stop of the photostimulation sequence based on the trigger signal using hardware triggering; thereby achieving high-precision time synchronization between photostimulation and magnetic resonance scanning while maintaining magnetic resonance compatibility. This invention solves electromagnetic compatibility issues through a split architecture, achieves millisecond-level synchronization accuracy through hardware TTL triggering, and enhances experimental paradigm flexibility through modular programmable sequences, making it suitable for neuroscience research fields such as functional magnetic resonance imaging.