104 results about "Magnetic field shielding" patented technology

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.

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.

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.

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 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 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.

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.

This invention discloses a method for fabricating a non-magnetic spatial reticulated shell structure composed of carbon fiber sheets. The load-bearing components of this reticulated shell structure are made of non-magnetic carbon fiber, while the connecting nodes are made of non-magnetic titanium alloy. A magnetic shielding layer is arranged in the roof system above the structural layer, creating a non-magnetic space with a magnetic field strength below 1 nT inside the reticulated shell. Specifically, the load-bearing components are made of carbon fiber sheets, fixed by two carbon fiber limb plates in an interlimb connection to form a hollow rectangular composite section. The connecting nodes consist of titanium alloy node plates, titanium alloy bolt groups, and carbon fiber limb plates. The magnetic shielding layer of the roof system consists of a shielding layer pad, a shielding layer, a shielding layer pressure plate, a buffer layer, a permalloy plate, and pressure strips. This invention features lightweight, high strength, and non-magnetic properties, creating a near-zero residual magnetism space through the roof magnetic shielding layer. It can be applied to various functional buildings with high magnetic field shielding requirements, as well as to general construction engineering.

The application discloses a kind of magnetic field shielding method and device of mechanical pump electron beam welding, based on the simulation analysis of the magnetic field distribution at the weld of mechanical pump, according to the shape of mechanical pump, iterative design magnetic field shielding device, adopt high permeability permalloy to make " two half splicing " type double shielding structure, the splicing seam of inside and outside two shielding layers is 90 ° angle, installed in the periphery of mechanical pump, in the premise of not changing the performance of mechanical pump itself, not transforming electron beam welding equipment realizes beam current no deflection in the process of mechanical pump electron beam welding, realizes the precision welding of mechanical pump.

The utility model discloses an inductance insulation framework, which relates to the technical field of inductance frameworks and comprises an inductance framework, two groups of isolation parts and a pressing part, the two groups of isolation parts are symmetrically distributed on two sides of the inductance framework, each isolation part comprises a shielding wing plate made of aluminum, and the pressing part comprises a pressing plate made of aluminum. Two sliding blocks are arranged on the inner side face of the shielding wing plate in an up-down symmetrical elastic sliding mode, and two splayed push-pull rods are hinged to the face, away from the inductance framework, of the pressing plate. According to the utility model, through the arrangement of the isolation part, after the coil is wound from the outside of the inductor framework, the iron core is inserted from the inside of the inductor framework and the assembly of the non-shielding inductor is completed, the shielding wing plates are respectively clamped at the two sides of the inductor framework, so that the electromagnetic shielding characteristic of aluminum materials is utilized, and when a plurality of groups of non-shielding inductors are distributed and mounted on a circuit board, the shielding wing plates are clamped at the two sides of the inductor framework; the two groups of shielding wing plates made of aluminum materials are matched with each other, so that magnetic field shielding can be effectively carried out on the inductors from two sides, and mutual inductance interference between two adjacent inductors is avoided.

A magnetic field shielding sheet is provided. A magnetic field shielding sheet according to an embodiment of the present invention comprises: a plate-shaped sheet body having a magnetic sheet containing a metal component so as to be capable of shielding a magnetic field generated by an antenna, and having a first surface and a second surface facing each other; a first protective sheet attached to a first surface of the sheet main body with an adhesive layer as a medium to prevent the first surface from being exposed to the outside; and a second protective sheet attached to a second surface of the sheet body with an adhesive layer as a medium to prevent the second surface from being exposed to the outside, wherein the first protective sheet and the second protective sheet are respectively made of a non-conductive material with a magnetic field shielding property, so that the sheet main body is protected from being influenced by an external environment, the shielding property of the sheet main body is supplemented, and the eddy current loss is reduced.

The invention relates to a magnetic field shielding structure and a transient electromagnetic detection device, and relates to the technical field of transient electromagnetic detection, the magnetic field shielding structure comprises a shielding member, the shielding member comprises a plurality of shielding structures, the plurality of shielding structures are arranged along the circumferential direction of the shielding member, each shielding structure comprises a shielding part and an isolation part, and in two adjacent shielding structures, the isolation part is arranged along the circumferential direction of the shielding member. The shielding part and the isolation part are arranged in a staggered manner, the isolation part is made of an insulating material, the magnetic field intensity radiated by the transmitting coil in non-detection directions such as the upward direction and the lateral direction can be effectively weakened through the arrangement of the shielding part, invalid interference signals can be reduced, and meanwhile, the shielding part and the insulating isolation part are arranged in a staggered manner, so that the shielding effect is improved. Therefore, generation of eddy current in the shielding part can be inhibited, superposition of an additional secondary magnetic field formed by the eddy current and an effective secondary magnetic field signal generated by the underground target body can be avoided, the accuracy of detection data can be greatly improved, and the problem of detection distortion caused by eddy current interference of an existing shielding structure is solved.

The utility model relates to the technical field of magnetic induction type keyboards, in particular to a magnetic suction foot support structure of a magnetic induction type keyboard, and aims to solve the problems that a traditional buckle foot support is not attractive and a traditional magnetic suction type foot pad can interfere with the magnetic induction type keyboard, the magnetic suction foot support structure comprises a bottom shell, and a circuit board is fixedly installed on the inner wall of the bottom shell. According to the magnetic induction keyboard, the first Halbach array magnet and the second Halbach array magnet are matched with each other, so that the magnetic field of the sides, close to each other, of the first Halbach array magnet and the second Halbach array magnet is increased, the magnetic field of the sides, away from each other, of the first Halbach array magnet and the second Halbach array magnet is greatly reduced, and interference on the magnetic induction keyboard is reduced; a magnetic field above the first Halbach array magnet can be collected and absorbed again through the magnetic field shielding alloy block, the first Halbach array magnet can be prevented from interfering with a magnetic induction element on the circuit board, the keyboard bottom shell can be taken down at any time, it is ensured that the integrity of the bottom of the keyboard bottom shell is not damaged, the attractiveness is improved, and the keyboard is convenient to use. And the method is suitable for a magnetic induction keyboard.

The application discloses a kind of rock core orienter for paleomagnetic research, belong to paleomagnetic rock core measurement technical field, including the hollow column of collaborative work, magnetic field shielding component, automatic leveling and inclination measurement component, inclination measurement component, sun compass and sun angle measurement component, data acquisition and storage component, automatic ink jet marking component and matching software system;Each component is sequentially layered assembly, forms the automation closed loop of "insertion-leveling-measurement-verification-recording-marking-transmission".The rock core orienter for paleomagnetic research described above is used in the application, can greatly reduce manual operation steps, avoid human error and magnetic interference, improve measurement accuracy and data consistency, realize that core orientation work efficiency is significantly improved, measurement result is more reliable, sample corresponding is clear and post information management is convenient traceability.

The utility model discloses a winding structure with a magnetic field shielding assembly, which comprises an annular body, the annular body is provided with a notch, the annular body is provided with a connecting piece, the annular body is made of an aluminum plate with the thickness of 2mm and is used for being installed at the lower end part of a transformer coil winding, and the annular body is grounded. The utility model has the beneficial effects that the leakage magnetic field of the transformer is effectively reduced, the leakage magnetic field generated in the transformer is effectively blocked and reflected, the interference of the leakage magnetic field to surrounding electrical equipment is reduced, and the performance and the stability of the transformer are improved; the influence of a leakage magnetic field and external electromagnetic waves is reduced, the fault risk of the transformer is reduced, and the safety and stability are improved; the process is simple, operation is easy, and installation cost and maintenance difficulty are reduced.

The invention belongs to the technical field of sensors, and discloses a non-contact current sensor with self-correction and high heat dissipation, which comprises an annular shell, a magnetic induction array, a unit self-correction mechanism, an efficient heat transfer structure, an intelligent heat dissipation system and a control module, if the magnetic field shielding heat conduction layer detects interference, the control module controls the micro push rod to realize geometric correction according to a feedback signal of the displacement sensor; and the intelligent heat dissipation system and the efficient heat transfer structure are adjusted according to signals of the temperature sensor, and the uniformity of the temperature field is kept. According to the sensor, synchronous adjustment of temperature and structural parameters is realized through a double closed-loop control mechanism, so that the sensor keeps high-precision work in high-temperature, vibration and electromagnetic interference environments; the phase change heat conduction material and the high heat conduction silica gel layer effectively buffer thermal stress and mechanical stress, prolong the service life of the device and reduce the maintenance frequency.

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 keyboard and a key structure thereof, the keyboard comprises a first key, a second key and a magnet, the first key comprises a first shielding piece and a first Hall sensor, the second key is arranged adjacent to the first key and comprises a second shielding piece and a second Hall sensor, the magnet is arranged between the first key and the second key, and the first shielding piece and the second Hall sensor are arranged on the first key. A first fixed distance is kept between the magnet and the first Hall sensor, a second fixed distance is kept between the magnet and the second Hall sensor, and when the first key is pressed, the first shielding piece moves relative to the magnet so as to change the magnetic field intensity of the magnet sensed by the first Hall sensor; and when the second key is pressed, the second shielding piece moves relative to the magnet so as to change the magnetic field intensity of the magnet sensed by the second Hall sensor. The magnetic field intensity received by each Hall sensor is changed in a magnetic field shielding mode, so that a plurality of adjacent keys can share magnets, the number of the magnets is effectively reduced, and the cost and the keyboard weight are further reduced.

In one aspect, an apparatus for use in a mass spectrometer is disclosed, which comprises an ion reaction device, which includes an ion dissociation unit (e.g., an ion-electron interaction unit) that can receive a plurality of precursor ions and cause their dissociation to generate a plurality of product ions, and a linear ion trap that can receive the product ions and isolate a target product ion of interest for mass analysis. The linear ion trap is positioned in a magnetic field and includes a set of quadrupole rods formed of a paramagnetic material to substantially shield the space between the quadrupole rods from the magnetic field, thereby reducing and preferably eliminating the interference of the magnetic field with the process of isolating the target product ion of interest.

A foldable electronic device according to an embodiment may include: a display panel configured to be folded along a folding axis parallel to a first direction; a plurality of adhesive layers located below the display panel and positioned in a region other than at least a portion of a folded region forming a curved surface in a folded state of the display panel; and a magnetic field shielding layer attached under the display panel through the plurality of adhesive layers.

A compact spin-exchange relaxation free biaxial inertial measurement structure, by locating the air chamber in the oven, the oven is positioned in the coil support cylinder, the coil support cylinder is positioned in the magnetic field shielding cylinder, can avoid the suspended installation, positioning is more reliable, is favorable for reducing the influence of external vibration and other interference, thereby improves the stability, reliability of the device, its characterized in that, including the magnetic field assembly installed on the main structure, the magnetic field shielding cylinder of magnetic field assembly is provided with coil support cylinder, the bottom of the cylinder nest groove of coil support cylinder is nested one end of oven, the other end of oven is nested by the bottom nest groove of oven support cylinder, the outer edge of the cylinder mouth of oven support cylinder is nested by the inner edge of the cylinder mouth of coil support cylinder, the oven is provided with clamping device used as air chamber installation reference.

This application discloses a display module, comprising: a display device including multiple sub-pixels and a semi-transparent, semi-reflective layer; a dimming component disposed on one side of the light-emitting surface of the display device, including a magneto-optical modulation layer and a polarizer disposed on the side of the magneto-optical modulation layer away from the display device; the magneto-optical modulation layer includes a stacked magnetic field shielding layer, a magnetizing element, and a magneto-optical medium layer, the magnetic field shielding layer being located on the side of the magnetizing element closer to the display device; the polarizer is used to modulate incident ambient light into first linearly polarized light; the magneto-optical medium layer is used to modulate the first linearly polarized light into second linearly polarized light under the drive of the magnetizing element; the semi-transparent, semi-reflective layer is used to reflect the second linearly polarized light to the magneto-optical medium layer; the magneto-optical medium layer is used to modulate the second linearly polarized light into third linearly polarized light, the third polarization angle of the third linearly polarized light being perpendicular to the first polarization angle of the first linearly polarized light. Through the above configuration, interference from ambient light is isolated, contrast is improved, and the light transmittance of the sub-pixels is guaranteed.

A current measurement system includes a magnetic field shield that is configured to capture, to an inside of the magnetic field shield, a magnetic field that is generated by a current that flows through a conductor, a magnetic field sensor that is installed inside the magnetic field shield, a predetermined sensor, and a current measurement apparatus, wherein the predetermined sensor is a sensor for detecting the conductor, the magnetic field sensor detects a magnetic field at an installation location, and the current measurement apparatus includes a processor configured to acquire a detection result of the predetermined sensor and a detection result of the magnetic field sensor, identify a center position of the conductor based on the acquired detection result of the predetermined sensor, and calculate a current value of the current that flows through the conductor based on the identified center position and the acquired detection result of the magnetic field sensor.

The invention belongs to the technical field of magnetic field shielding of transformer substation robots, and particularly relates to a magnetic field shielding device of a transformer substation robot and the transformer substation robot. The mounting seat is provided with a containing cavity used for mounting a to-be-shielded electronic module, the magnetic field detection mechanism comprises an X-axis detection antenna assembly, a Y-axis detection antenna assembly, a Z-axis detection antenna assembly and a magnetic field processing controller, and the magnetic field processing controller is mounted in the containing cavity. While the electromagnetic protection cost is reduced, the change of the amplitude of the resultant magnetic field can be detected, electromagnetic shielding is performed when the electromagnetic intensity is high, and electromagnetic protection at the top is canceled when the electromagnetic intensity is low, so that the influence of electromagnetism on the to-be-shielded electronic module can be effectively prevented; and the influence of electromagnetic protection on the wireless communication function of the robot can be reduced, and the electromagnetic protection and daily use requirements of the transformer substation robot are met.

The present disclosure relates to a system (400) and a method (700) for generating electrical energy based on magnetic field vibration includes a box structure (402) with a fixed shaft (408). A permanent ring magnet (410) encloses a section of the shaft. Rotatable housings (420, 444) enclose other shaft sections near the magnet's poles. Slotted discs (414, 438) are attached to these housings, enclosing additional shaft sections and covering the magnet's poles. Connecting plates (416, 440) link the slotted discs, partially covering the magnet and acting as magnetic field shields. An actuation unit generates rotational force, transferring it to the housings (420, 444), causing the slotted discs (414, 438) and connecting plates (416, 440) to rotate around the magnet (410). This motion modulates the magnet's fields into vibrating magnetic fields, converting them into electrical energy.

The present application relates to the field of electromagnetic shielding layered material, and provides a transparent film for electromagnetic field shielding and a preparation method thereof, the film is a three-layer structure, sequentially comprising a polycarbonate / polyetherimide blended base layer, a shielding functional layer containing surface modified GO / ITO composite filler and a fluorinated ethylene propylene copolymer protective layer. The GO / ITO composite filler is composed of ITO nanorods loaded with graphene oxide and is modified by sodium benzoate, and has good dispersibility and conductivity. The filler content and additives in the functional layer are optimized to improve the electromagnetic shielding and mechanical properties, and the overall film has excellent transparency, strength and shielding effect. The preparation process includes melt extrusion of the base, solution coating and multi-stage temperature control curing of the functional layer, gravure coating of the protective layer and hot pressing and stretching shaping, and the prepared product is suitable for electromagnetic interference protection of high-performance electronic devices, the process is stable, and has good industrialization prospect.