1166 results about "Magnetic shield" patented technology

The invention discloses an electrostatic induction and optical imaging principle-fused online monitoring device and method for wear particles of a water-lubricated bearing, and belongs to the field of state monitoring of mechanical equipment. The device comprises a square insulation detection cavity, a detection electrode array, an electromagnetic shielding shell, a high-speed optical imaging module and a signal processing unit, the square insulation detection cavity is installed in a bearing lubrication water loop. The detection electrode array is fixed to the outer wall of the cavity and used for capturing electrostatic signals generated when the abrasion particles pass through. The electromagnetic shielding shell wraps the detection cavity and is grounded through a wire to eliminate environmental electromagnetic interference. The high-speed optical imaging module integrates a high-magnification microscope lens and a CMOS sensor, is coaxially mounted with the detection cavity, and obtains the morphology characteristics of the wear particles in real time; and the signal processing unit performs multi-modal data fusion analysis on the electrostatic signal and the optical image. Through cooperative detection of electrostatic induction and optical imaging, the monitoring precision and reliability of the wear particles of the water-lubricated bearing are remarkably improved.

According to the cable multi-parameter fusion sensor and method, in the cable multi-parameter fusion sensor, a shielding shell is of an open-close type metal annular structure; the zero-flux sensor module is arranged on the inner layer of the shielding shell so as to detect a cable sheath ring current signal; the pulse current sensor module is arranged on the outer side of the zero-flux sensor module so as to detect a cable partial discharge pulse current signal and an overvoltage impact current signal; the magnetic shielding layer is arranged between the zero-flux sensor module and the pulse current sensor module to shield low-frequency magnetic field interference; the zero magnetic flux sensor module and the pulse current sensor module share the shielding shell to form an electromagnetic shielding structure.

The invention discloses a scanning electron microscope. The scanning electron microscope comprises a scanning electron microscope main body and a sample table located in a sample cavity, the scanning electron microscope main body is fixedly connected with the upper cover of the sample cavity, so that a closed space is formed in the sample cavity; a closed-loop groove is formed in an upper cover of the sample cavity; wherein the groove is located outside the connection position of the upper cover of the sample cavity and the scanning electron microscope main body, and the bottom of the groove is not higher than the supporting surface of the sample table; a magnetic shielding layer is arranged in the groove; wherein the length of the magnetic shielding layer is not less than the distance from the objective lens of the scanning electron microscope main body to the supporting surface of the sample stage.

The invention relates to the technical field of magnetic suspension bearings, and provides a magnetic leakage prevention bearing structure which comprises a flux sleeve, a shell, a magnetic part, an inner-layer magnet yoke and an outer-layer magnet yoke. The shell is sleeved outside the flux sleeve, and an inner ring of the shell is provided with a mounting space; the magnetic part is arranged in the mounting space; the inner-layer magnet yoke is arranged in the mounting space and connected with the shell, the inner-layer magnet yoke is concaved inwards to form a first containing groove, and the magnetic part is contained in the first containing groove; the outer-layer magnet yoke is arranged in the installation space and connected with the shell, the outer-layer magnet yoke is concaved inwards to form a second containing groove, and the inner-layer magnet yoke is contained in the second containing groove. A closed magnetic circuit is formed through a double-layer magnet yoke nested structure, the axial magnetic shielding layer design is matched, magnetic flux leakage is effectively restrained, the magnetic field energy utilization rate is increased, electromagnetic interference to external equipment is reduced, and meanwhile the bearing performance and operation stability of the bearing are remarkably improved by optimizing magnet yoke thickness distribution and the permanent magnet arrangement mode.

The invention discloses a preparation method of a flexible electromagnetic shielding type force sensor based on a coaxial structure, and belongs to the field of flexible electronics and intelligent sensors. According to the method, a coaxial wet spinning process is adopted, a core-sheath structure conductive fiber is constructed, a core layer is made of a multi-walled carbon nanotube (CNT) and thermoplastic polyurethane (TPU) composite material, and a sheath layer is made of a nickel-coated carbon nanotube (Ni-CNT) and TPU composite material. By regulating and controlling the proportion of the core sheath, the construction of the gradient conductive network is realized, and the sensing sensitivity, the electromagnetic shielding performance and the mechanical flexibility are improved. The obtained Ni-CNT-coated CNT fiber is made into fabric and integrated in a sensing glove, and multi-finger bending detection and wireless man-machine interaction control are achieved. The sensor has the advantages of high sensitivity, wide strain detection range and excellent electromagnetic shielding effectiveness, is suitable for the fields of intelligent wearing, anti-interference man-machine interface and fire-fighting equipment, and can also be expanded to complex application scenes such as aerospace teleoperation.

The pressure release valve comprises a shell and a fixing sleeve arranged on the shell, an installation cavity is formed in the shell, an electromagnetic coil assembly is arranged in the installation cavity, the magnetic isolation sleeve is inserted in the installation cavity, the magnetic isolation sleeve is connected between the shell and the fixing sleeve in an abutting mode and isolates the installation cavity, and the electromagnetic coil assembly is arranged in the magnetic isolation sleeve. A movable valve element is arranged on the magnetism isolating sleeve in a sliding mode, and the end of the movable valve element is connected with a sealing piece.

The invention relates to the technical field of magnetic shielding, and discloses a self-adaptive active adjustment type magnetic shielding device demagnetization circuit and device, and a control acquisition system, which are used for comparing a residual magnetism state with a preset expected value and generating a control instruction; the energy output identification system is used for outputting an alternating current degaussing signal according to the control instruction to perform degaussing, outputting an excitation pulse signal to perform residual magnetism detection, identifying a zero crossing point of the alternating current degaussing signal and realizing mode switching of degaussing and residual magnetism detection; and the magnetic shielding device is used for demagnetizing under the action of the alternating current demagnetizing signal and feeding back the residual magnetism state of the preset feature point under the action of the excitation pulse signal. The demagnetization is interrupted at the preset feature points in the demagnetization process, the real-time residual magnetism state is collected, and the demagnetization parameter at the next moment is adjusted after the real-time residual magnetism state is compared with the preset residual magnetism expected value, so that the problem of low efficiency due to the fact that the demagnetization parameter needs to be reset after the process is finished is solved, and the demagnetization efficiency and accuracy are greatly improved.

The invention provides a magnetic shielding box for weak magnetic signal measurement and a shielding effectiveness estimation method. The magnetic shielding box comprises a non-magnetic supporting frame and a shielding mechanism. The non-magnetic supporting frame is a cuboid, is at least arranged along the edges of the cuboid and is used for supporting the shielding mechanism, and the interior of the non-magnetic supporting frame is hollow so as to accommodate an object to be detected; the shielding mechanism at least comprises N layers of plate layer structures, plate layer fixing pieces and plate layer supporting pieces; the plate layer structures are sequentially arranged outside the non-magnetic supporting frame in a sleeving mode so as to isolate an external magnetic field of the magnetic shielding box. The plate layer fixing piece sequentially penetrates through all the plate layer structures and is fixedly embedded into the non-magnetic supporting frame. The plate layer supporting pieces are at least arranged between the two adjacent plate layer structures and used for controlling the distance between the two adjacent plate layer structures. N is an integer greater than or equal to 2. The problem of complex manufacturing of the magnetic shielding box can be solved, and the shielding effects of different frequency bands are ensured.

The invention provides a magnetic shielding unit hanging positioning and precision adjusting tool and an installation method. The magnetic shielding unit positioning tool comprises a sleeving shell matched with the outer contour of a base and provided with an opening in the lower portion. A guide channel is formed in the middle of the sleeving shell; a guide structure expanding outwards is formed at the inlet end of the guide channel, and a positioning closing opening for clamping a hook of the magnetic shielding unit is formed at the tail part of the guide structure; the parts, on the two sides of the guide channel, of the sleeving shell are connected. The magnetic shielding unit hanging precision adjusting tool comprises a sleeving frame which is matched with the outer contour of a base and provided with an opening in the lower portion. Two threaded driving units are symmetrically arranged in the middle of the sleeving frame, the axes of the two threaded driving units are parallel, and the ends of the two threaded driving units are oppositely arranged. And an adjusting space for accommodating a hook of the magnetic shielding unit is formed between the two threaded driving units. According to the scheme, rapid hanging mounting is achieved through a horn mouth type guide structure of the positioning tool, and the precision is guaranteed through fine adjustment of double screws of the adjusting tool.

The invention relates to the technical field of magnetic shielding, and provides a demagnetization method and device for a magnetic shielding device, electronic equipment and a readable storage medium, and the method comprises the steps: collecting a feedback circuit signal of a target magnetic shielding device through a voltage and current collection unit; analyzing the feedback circuit signal by using a signal acquisition processor, determining the current degaussing demand of the target magnetic shielding device, and calculating a degaussing pulse parameter matched with the current degaussing demand; a pulse generating unit is used for generating a target pulse with the adjustable pulse width according to the degaussing pulse parameters, the target pulse is a bipolar square wave pulse, and the adjusting interval of the pulse width comprises the millisecond level and the nanosecond level; and utilizing a pulse switching unit to act the target pulse on the target magnetic shielding device, so that the target magnetic shielding device is subjected to magnetic saturation or magnetic fading. According to the technical scheme provided by one or more embodiments of the invention, the average power demand of the degaussing power supply can be reduced, and the degaussing effect can be improved.

The utility model relates to the field of electromagnetic shielding films, in particular to an electromagnetic shielding film, which comprises a multi-layer composite structure and is characterized in that the electromagnetic shielding film is formed by compounding at least four layers of materials, namely a base material layer 1, a conductive grid layer 2, an electromagnetic absorption layer 3 and a protective layer 4 in sequence; the base material layer 1 adopts a light high-strength polymer film as a substrate and has excellent flexibility and mechanical strength; the conductive grid layer 2 is located on the base material layer 1, is of a grid structure formed by fine metal wires or high-conductivity polymer fibers, is formed through a precise weaving or printing technology and is used for guiding and dispersing electromagnetic wave energy; the technical problem that the service life and the shielding effect of the electromagnetic shielding film are affected due to the fact that the electromagnetic shielding film is prone to abrasion, scraping and the like in the long-term use process is solved.

The invention discloses a ferromagnetic material internal defect leakage magnetic field increasing method based on alternating current and direct current composite magnetization, which comprises the following steps of: fixing a workpiece at the center of a composite exciting coil, and synchronously applying direct current and high-frequency alternating current; after pure direct current magnetization is saturated, current is locked, and a basic leakage magnetic field is established; the surface magnetic conductivity is dynamically reduced by overlapping alternating current, and the magnetic shielding effect is weakened; a leakage magnetic field signal is scanned and collected through a differential Hall sensor array, and background magnetic field deduction, peak value comparison and adaptive filtering processing are carried out; and determining an optimal magnetization parameter combination by adopting a gradient descent method and Bayesian optimization. The system is integrated with a composite excitation coil and a signal conditioning unit, so that synchronous excitation, signal acquisition and real-time analysis are realized. The leakage magnetic field signal at the deep defect is enhanced through alternating-current and direct-current composite magnetization, the problem of signal weakening caused by traditional direct-current saturation is solved, the defect detection sensitivity and efficiency are improved, and the method is suitable for non-destructive detection scenes of ferromagnetic materials.

The invention relates to the technical field of magnetic shielding spaces, and discloses a wide-range pulse forming circuit and device for a magnetic shielding space, and charging units in a positive pulse forming circuit and a negative pulse forming circuit are used for boosting and charging an energy storage element of a stacked boosting unit in a continuous oscillation mode; the stacked boosting unit is composed of multiple stages of Marx circuit modules and used for achieving parallel charging and series discharging of an energy storage element through switch time sequence control and outputting bipolar rectangular pulses with independently adjustable amplitude and pulse width. The noise reduction and direct current blocking module is used for noise reduction and direct current blocking processing; the magnetic shielding device is used for demagnetizing the magnetic shielding space. By arranging the positive pulse forming circuit and the negative pulse forming circuit which are the same in structure and are independent, and combining the multi-stage Marx circuit module of the stacked boosting unit and the switch time sequence control, the amplitude and the pulse width of the bipolar rectangular pulse are independently adjustable, so that the problem of diversified demagnetization requirements of the magnetic shielding device can be adapted, and the demagnetization efficiency of the magnetic shielding device is improved. And the application range of the circuit is widened.

The invention belongs to the technical field of electromagnetic shielding, and relates to an electromagnetic shielding enhanced halogen-free flame-retardant PBT composite fiber and a preparation method thereof.The electromagnetic shielding enhanced halogen-free flame-retardant PBT composite fiber comprises a PBT matrix, carbon fibers, magnetic ferrite coating glass fibers and a halogen-free flame retardant, and the carbon fibers, the magnetic ferrite coating glass fibers and the halogen-free flame retardant are dispersed in the PBT matrix; the magnetic ferrite coating glass fibers are distributed randomly; the electromagnetic shielding effectiveness of the fabric woven by the PBT composite fibers at 30 MHz to 1 GHz is greater than 60 dB; during preparation, the PBT, the halogen-free flame retardant and the antioxidant are uniformly mixed and then conveyed into a double-screw extruder, then the carbon fibers, the magnetic ferrite coating glass fibers and the OPE wax are added into the double-screw extruder from a side feeding port, and after melt extrusion granulation, a product is prepared by adopting a spinning, drafting and winding one-step method. The PBT composite fiber disclosed by the invention has an excellent electromagnetic shielding effect; during preparation, the problem of wick effect is solved through compounding of CF and GF.

The utility model relates to a multi-directional adjusting clamp for measurement in a magnetic shielding barrel. The utility model is suitable for the technical field of magnetic shielding. The technical problem to be solved by the utility model is to provide the multi-directional adjusting clamp for measurement in the magnetic shielding barrel. According to the technical scheme, the multi-direction adjusting clamp for measurement in the magnetic shielding barrel comprises a supporting assembly, and the top of the supporting assembly is provided with a base support capable of sliding in the X-axis direction; the height adjusting assembly is installed on the base support, a movable platform is arranged on the height adjusting assembly, and the height adjusting assembly can adjust the height of the movable platform in the Z-axis direction; the stretching assembly is installed on the side wall of the moving platform in a sliding mode, and the stretching length of the stretching assembly in the Y-axis direction can be adjusted through the stretching assembly; the sensor placing table is connected to the stretching assembly in a sliding mode, and the sensor placing table can move in the Y-axis direction; and the moving assembly is arranged at the bottom of the supporting assembly and the end of the stretching assembly, and the moving assembly can convey the whole clamp into the magnetic shielding barrel.

This invention discloses a thermally conductive and electromagnetically shielding multilayer composite film, its preparation method, and its applications. The thermally conductive and electromagnetically shielding multilayer composite film of this invention comprises an insulating and thermally conductive layer, a magnetic shielding layer, a conductive shielding layer, and an insulating and thermally conductive layer stacked sequentially. The insulating and thermally conductive layer is a cellulose film containing thermally conductive fillers; the magnetic shielding layer is a cellulose film containing magnetic fillers and expanded microspheres; and the conductive shielding layer is a cellulose film containing conductive fillers and expanded microspheres. The thermally conductive and electromagnetically shielding multilayer composite film of this invention has advantages such as excellent in-plane thermal conductivity, excellent electromagnetic shielding performance, high mechanical strength, and small thickness. Furthermore, its preparation process is simple and environmentally friendly, and it has broad application prospects in fields such as 5G communication, consumer electronics, new energy batteries, and national defense.

The quantum current transformer based on the optical fiber isolation microwave transmission comprises a high-voltage primary side which comprises a magnetic shielding ring and an NV color center magnetic sensing probe module, and a magnetic sensing probe is arranged in the magnetic shielding ring; at the low-voltage secondary side, the microwave system is used for generating radio-frequency signals in a preset frequency range and transmitting the radio-frequency signals to the NV color center magnetic-sensing probe module, the laser system is used for generating continuous laser and transmitting the continuous laser to the NV color center magnetic-sensing probe module, and the microwave system and the laser system are used in cooperation to drive the NV color center to generate fluorescence signals representing the magnetic field intensity. A fluorescence signal is transmitted to the data processing system to calculate to-be-detected current information; wherein the microwave system is connected with the NV color center magnetic sensing probe module through an optical fiber, the microwave system modulates the radio frequency signal into an optical signal, transmits the optical signal to the NV color center magnetic sensing probe module, and restores the optical signal into the radio frequency signal in the NV color center magnetic sensing probe module to be received. According to the transformer, stable transmission of microwave signals under the high-low voltage isolation condition is achieved, the design is reasonable and exquisite, and the measurement precision is high.

The invention belongs to the technical field of magnetic shielding materials, and particularly relates to a nanocrystalline slotting and soft magnetic alloy powder filling composite magnetic sheet and a preparation method thereof. The composite magnetic sheet comprises a magnetic material layer formed by alternately compounding a nanocrystalline material layer and a double-faced adhesive tape, the magnetic material layer is provided with regularly distributed slotting structures, and the slotting structures are filled with soft magnetic alloy powder. The preparation method comprises the following steps: alternately compounding a nanocrystalline material layer and a double-faced adhesive tape to form a magnetic material layer, and performing die cutting to form a regularly distributed slotting structure; or the nanocrystalline material composite layer is subjected to die cutting to form a regularly-distributed through slotting structure, and then the structure is compounded with the composite layer which is not slotted to obtain the magnetic material layer; and then filling and fixing the slotting structure by adopting soft magnetic alloy powder to obtain the composite magnetic sheet. According to the invention, the defect of easy magnetic saturation due to local lack of magnetic materials after slotting can be avoided, and the obtained composite magnetic sheet has low loss and high saturation current at the same time.

The invention belongs to the technical field of electrical equipment magnetic monitoring, and discloses an electrical equipment magnetic field interference intelligent monitoring and early warning sensing system, which establishes a magnetic field, working condition, environment and space four-dimensional data sensing system and matches a bimodal separation technology. Pure magnetic field interference, working condition correlation interference, environment induced interference and space correlation interference components can be effectively separated; the generated three-dimensional traceability map can visually present the position of an interference source, a propagation path and the priority of affected equipment, and then the accuracy of interference type identification and source positioning is greatly improved in combination with a feature library covering a large amount of historical normal operation data, so that fault pre-judgment is changed from passively coping with an existing fault into actively preventing and controlling risks in advance; a dual-path active suppression mechanism is formed by combining a software compensation mode of dynamically generating a magnetic field compensation current through a PID control algorithm with a tunable magnetic shielding device hardware adjustment means configured for high-priority equipment.

A wearable sweat sensing device configured to be placed on a wearer's skin includes a sensor component, including at least one analyte-specific sensor for measuring a target analyte in sweat, and at least one electromagnetic shield to protect at least a portion of the sensor component from electromagnetic interference. The at least one electromagnetic shield may include a first electromagnetic shield for protecting the sensor component from electromagnetic interference originating outside the wearer's body and a second electromagnetic shield for protecting the sensor component from electromagnetic interference originating from the wearer's body or propagating through the wearer's body.

The embodiment of the invention relates to the technical field of communication, and discloses a radar antenna and an automobile intelligent driving system.The radar antenna comprises a substrate, an electromagnetic band gap structure layer, a ridge waveguide transmission structure and an antenna radiation layer, the electromagnetic band gap structure layer is provided with a pin unit, and the pin unit forms an electromagnetic shielding area; the ridge waveguide transmission structure is arranged in the electromagnetic band gap structure layer, one end of the ridge waveguide transmission structure is connected with a chip interface, the other end of the ridge waveguide transmission structure is connected with the antenna radiation layer, and the antenna radiation layer comprises a plurality of slot antennas arranged in the longitudinal direction and a plurality of choke groove assemblies. One choke groove assembly is adjacent to one slot antenna, and the electromagnetic band gap structure layer is connected with the antenna radiation layer to form a gap waveguide transmission channel. By means of the mode, electromagnetic connection between the layers can be achieved without a welding process, and the influence of welding quality difference on the antenna performance is avoided.

The invention belongs to the technical field of hydrophobic electromagnetic shielding materials, and particularly relates to an asymmetric electromagnetic shielding composite film and a preparation method and application thereof. The PNTs are polypyrrole nanotubes, after Na2MoO4. 2H2O and CH4N2S are added and subjected to a high-temperature reaction, a MoS2 flower-shaped shell structure can grow on the PNTs, the layered structure and the high specific surface area of MoS2 contribute to enhancing scattering and absorption of electromagnetic waves, and rich defect sites can induce dielectric polarization to achieve dielectric loss. Introducing the PNTs (at) MoS2 core-shell nanowire as an electromagnetic wave absorbent into a polylactic acid / dichloromethane system, then putting the system into a culture container in which a conductive filler is pre-paved, and standing and volatilizing at room temperature by adopting an ethanol solution as a volatile agent to finally obtain a three-layer asymmetric electromagnetic shielding composite film comprising the conductive filler, the PNTs (at) MoS2 structure and a polylactic acid matrix from bottom to top. And an asymmetric conductive gradient network is constructed, and the EMI shielding performance which mainly focuses on absorption is remarkably improved, so that the secondary radiation problem of electromagnetic waves is reduced.

The invention discloses an anti-magnetic interference magnetic flap liquid level meter, and relates to the technical field of magnetic flap liquid level meters, the anti-magnetic interference magnetic flap liquid level meter comprises a main pipeline and a blow-down valve in flange connection with the bottom end of the main pipeline, the front surface of the main pipeline is fixedly provided with a magnetic flap indicator, the inner wall of the main pipeline is symmetrically provided with slide rails, and the slide rails are slidably connected with slide blocks; the number of the sliding blocks is two, a magnetic floater is fixedly installed between the two sliding blocks, and a plurality of rolling wheel installation grooves are formed in the ends, close to the sliding rails, of the sliding blocks. By arranging a totally-closed electromagnetic shielding structure, interference of an external strong magnetic field is effectively blocked, it is ensured that magnetic coupling between the magnetic floater and the turning plate is stable, and the problems of false operation of the turning plate and display misalignment are solved; meanwhile, the combination of the sliding rail and the sliding block with the rolling wheel is adopted, the magnetic floater is restrained to move only in the vertical direction, the rolling, collision and jamming risks of the magnetic floater during medium boiling are reduced, the magnetic synchronism stability is maintained, and the problems of floater instability and indication distortion are solved in a targeted mode.

The application discloses a novel lung lobe-shaped magnetic shielding partial discharge detection device and a detection method. The device comprises an isolation transformer, a bushing, a detection electrode and a partial discharge instrument. A single-phase power supply is connected with a reactor in parallel, and then connected with an input end of the isolation transformer. One end of an output end of the isolation transformer is connected with the bushing, and then connected with the detection electrode. The other end of the output end of the isolation transformer is grounded. A grounding end of a to-be-detected lung lobe-shaped magnetic shielding is grounded, and the grounding end of the to-be-detected lung lobe-shaped magnetic shielding is connected with the partial discharge instrument. The to-be-detected lung lobe-shaped magnetic shielding and the detection electrode are correspondingly arranged to form an equivalent capacitor and are coupled and connected. The application can be used to determine whether there is a defect in the lung lobe-shaped magnetic shielding by performing a partial discharge test on the lung lobe-shaped magnetic shielding before the lung lobe-shaped magnetic shielding is assembled into a transformer. The application has the characteristics of high test efficiency and low applied voltage, and greatly improves the first-time pass rate of the transformer product provided with the lung lobe-shaped magnetic shielding.

The application relates to the technical field of laser detection tooling, and particularly discloses a thickness detection mechanism for an electromagnetic shielding sputtering film coating layer, which comprises a rack and a machine shell fixed to the outer side of the top end of the rack; further comprises a lifting plate which is installed in the middle part of the inner side of the machine shell in a lifting manner through a lifting adjusting mechanism, a first rotating disc is rotatably installed on the inner side of the lifting plate, and the top surface of the first rotating disc is fixed with two groups of upper laser measuring assemblies; a fixing frame is installed on the middle part of the top surface of the rack in a sliding manner through a sliding adjusting mechanism, a second rotating disc is rotatably installed on the inner side of the fixing frame, and the bottom surface of the second rotating disc is fixed with two groups of lower laser measuring assemblies corresponding to the upper laser measuring assemblies. The thickness detection mechanism for the electromagnetic shielding sputtering film coating layer can be adaptively adjusted and matched, can be used in sample and continuous detection double scenes through double-face synchronous laser measurement and rotating adjustment, and can complete coating thickness detection with high precision and high efficiency.

The invention relates to a design method of a magnetic shielding system and the magnetic shielding system.The design method of the magnetic shielding system comprises the steps that a shielding parameter calculation model of multi-layer cylinder magnetic shielding is established, parameters of the cylinder magnetic shielding serve as input, and shielding coefficients serve as output; performing optimization solution on the shielding parameter calculation model through a first optimization algorithm to obtain an optimal shielding parameter combination; the optimal shielding parameter combination is used for building a passive magnetic shielding cylinder; establishing a magnetic field calculation model generated by the magnetic field decoupling shimming coil in the passive magnetic shielding cylinder, taking the parameters of the cylinder magnetic shielding and the parameters of the shimming coil as inputs, and taking the magnetic induction intensities in the radial direction, the azimuth angle and the height direction as outputs; optimizing the magnetic field decoupling shimming coil configuration by adopting a second optimization algorithm based on the magnetic field calculation model to obtain an optimal coil configuration; the magnetic field decoupling shimming coil is wound in the passive magnetic shielding cylinder based on the optimal coil configuration. Through collaborative optimization of magnetic shielding and shimming coils, extremely weak magnetic measurement is realized.

The utility model relates to road detection technical field especially, it relates to a road flatness intelligent detection device, including main control circuit, multichannel capacitance sensor array, electromagnetic shield casing, the multichannel capacitance sensor array is by the multiple capacitive proximity sensor that is arranged in matrix, is fixed in detection device bottom, the multichannel capacitance sensor array adopts differential type measurement structure, and is equipped with the isolation drive ring between adjacent capacitive proximity sensor, the signal conditioning circuit is connected between the multichannel capacitance sensor array and main control circuit, the inertia measurement unit is connected to main control circuit, the electromagnetic shield casing covers the device, adopts the layered shielding structure, contains at least one conducting layer and a layer electromagnetic shield layer, and is connected through multipoint earthing between layers, the utility model can adopt multichannel capacitance sensor array and realize high accuracy, non -contact type measurement, and through the electromagnetic shield design, temperature compensation and attitude change compensation of the target ensure measurement stability.

The invention discloses an anti-electromagnetic interference type unmanned aerial vehicle defense matrix, which relates to the field of electromagnetism, and comprises a multi-node defense unit array which is distributed to form a three-dimensional defense network; each node defense unit is coated with the electromagnetic shielding layer, and the electromagnetic shielding layer is made of a conductive composite material; the anti-interference communication module adopts a frequency hopping spread spectrum technology and an encrypted channel; the main control system is used for dynamically distributing defense resources and monitoring electromagnetic interference intensity in real time; and the energy module provides redundant power supply for each unit. Multilayer electromagnetic shielding effectiveness is achieved, the full-band electromagnetic shielding effectiveness is larger than or equal to 50 dB through the composite structure of the metal nanofiber layer and the ferrite wave-absorbing material, the protection capacity is improved by 150% compared with that of a traditional aluminum alloy shell, and it is ensured that the system stably operates in the strong electromagnetic interference environment.

The utility model discloses an electromagnetic induction eddy current heating electromagnetic emitter with magnetic shielding, the electromagnetic emitter comprises a magnetic shielding cover (1), a coil (2) and a coil support (3), the coil (2) comprises a coil main body (21) formed by conducting wires and a pair of coil pins (22), the coil support (3) comprises a support wall (31), a support bottom (32) located at the lower end of the support wall (31) and a pin through hole (33), and the support wall (31) is connected with the support bottom (32). The coil body (21) is arranged on the coil support (3), the coil pins (22) penetrate out of the pin through holes (33), and the coil body (21) is located in a coil space (14) defined by the coil support (3) and the magnetic shielding cover (1). The structure of the magnetic induction coil assembly is simplified, the magnetic shielding efficiency is improved, the provided electromagnetic emitter is high in integration degree, large-scale assembly production is facilitated, and the production efficiency of electronic cigarette appliances can be effectively improved.

The application discloses an electromagnetic shielding sealant strip, which comprises a sealant strip, one end of the sealant strip is connected with glass, the other end of the sealant strip is connected with a door frame, the sealant strip comprises a main strip, a throwing groove is arranged on the main strip, and a throwing core strip is clamped and connected in the throwing groove. The electromagnetic shielding sealant strip can achieve the purpose of quick escape, quickly separate the glass from the door frame, and does not need to break the glass to escape, thereby saving the escape time, reducing the risk of injury in the escape process, ensuring the efficiency of separating the glass, and making the process more simple, so that the glass is completely separated, and glass fragments generated after the glass is knocked to pieces are avoided, and personnel are not scratched in the emergency escape process.