77 results about "Electromagnetic reflection" patented technology

The invention belongs to the technical field of chip detection, and discloses a semiconductor wafer surface chip detection method and system, and the method comprises the steps: taking an electromagnetic feature vector as a positive sample instruction signal, and constructing a positive sample database; scanning an electromagnetic radiation signal of a chip on the surface of the semiconductor wafer to be detected, and outputting an electromagnetic radiation signal to be matched after performing windowing and framing processing on the electromagnetic radiation signal; uploading the electromagnetic radiation signal to be matched to a positive sample database for area interception processing, measuring the distance between an interception result and any positive sample instruction signal in the positive sample database, and obtaining a chip electromagnetic state detection result; simulating a chip impedance mismatching condition, and generating a reflected signal defect qualitative set according to a simulation result; and matching defects of the chip on the surface of the semiconductor wafer to be detected, and predicting the service life of the chip on the surface of the semiconductor wafer to be detected in combination with a chip electromagnetic state detection result. According to the invention, non-surface and non-dominant defects of the chip can be detected according to an electromagnetic reflection signal.

The invention discloses a mechanical non-resonant one-bit phase electromagnetic reflection metasurface unit, and belongs to the field of artificial electromagnetic materials. The unit comprises a non-resonant electromagnetic structure and a mechanical driving device. The non-resonant electromagnetic structure comprises a dielectric layer, an air layer and an adjustable metal backboard from top to bottom; the mechanical driving device adopts a bidirectional self-holding electromagnet, a screw rod of the bidirectional self-holding electromagnet is connected with the metal back plate, the back plate is driven to be switched between two preset positions through forward / reverse pulse current, the thickness of an air layer is accurately adjusted, and therefore one-bit dynamic switching of a reflection phase between 0 degree and 180 degrees is achieved through propagation phase accumulation. In the 5G millimeter wave frequency band of 20 GHz to 29.5 GHz, the reflection coefficients of the two states are both larger than 0.99, the phase difference is stabilized within 180 degrees + / -20 degrees, and good robustness is achieved for mechanical displacement deviation. The unit has the advantages of zero static energy consumption, low insertion loss, wide bandwidth, simple structure and simple control, and is suitable for a low-power-consumption intelligent reflecting surface and a dynamic beam forming system.

The application belongs to the technical field of test and measurement, and particularly relates to a tight-field reflecting surface realized by building cement. The tight-field reflecting surface is used for low-frequency tight-field measurement and mainly comprises a cement support, a cement parabolic reflecting surface arranged on the cement support, a surface geometry of the cement parabolic reflecting surface being a parabolic surface with periodic side teeth, and a metal plating layer formed on the surface of the cement parabolic reflecting surface and used for providing a metal boundary condition for electromagnetic reflection. The application can greatly reduce manufacturing cost and effectively form a high-quality quiet zone in a low-frequency band.

The invention discloses an inflatable corner reflector, and belongs to the technical field of electromagnetic reflection, the inflatable corner reflector comprises an inflatable column frame, a corner reflector and a protective cover cloth, the inflatable column frame is composed of twelve inner air columns and thirty outer air columns, and the inflatable column frame is of a regular icosahedron structure after being inflated and unfolded; wherein one ends of the twelve inner air columns converge at the center of the regular icosahedron and are communicated with one another, the other ends of the twelve inner air columns extend outwards to correspond to the vertex of the regular icosahedron, and the thirty outer air columns are respectively communicated with the extending end parts of the two adjacent inner air columns; a corner reflector is arranged in each placing cavity, and the reflecting surface of each corner reflector is coplanar with the center line of the corresponding outer air column; the protective cover cloth wraps the outer contour of the inflatable column frame and covers all the corner reflectors. The overall size can be reduced, meanwhile, the inflation volume of the inflation column frame is reduced, the area of each reflecting face of the corner reflector is increased, the laying speed is increased, and the electromagnetic scattering sectional area is increased.

A positioning method includes: transmitting, by a transmitting device, a pilot signal to an electromagnetic reflecting surface; transmitting, by the transmitting device, control information to an electromagnetic reflecting surface control unit, where the control information includes temporal information and control direction information, the control information is used for instructing the electromagnetic reflecting surface control unit to orient, in target time periods, reflected beams formed by target pilot signals on the electromagnetic reflecting surface towards preset directions, and the preset directions are directions indicated by multiple pieces of preset direction information corresponding to respective ones of the target time periods; and determining, by the transmitting device or the receiving device, signal measurement results corresponding to the preset directions, and positioning, by the transmitting device or the receiving device, the receiving device according to the preset directions and the signal measurement results.

The invention relates to a method for processing a vehicle tire (1), comprising the following steps: - Providing a vehicle tire (1), wherein the vehicle tire (1) has an outer region (4); - providing an electromagnetically reflecting substance (11); - Arranging the electromagnetically reflecting substance (11) in an area (10) of the outer region (4) of the vehicle tire (1).

The invention discloses an anti-electromagnetic interference shielding type optical fiber connector structure and a manufacturing method, and belongs to the technical field of optical fiber connectors. The optical fiber connector structure comprises a shielding conductive shell, and the two ends of the shielding conductive shell are connected with a first connecting piece and a locking assembly respectively; the end, away from the shielding conductive shell, of the first connecting piece is fixedly provided with an annular conductive contact piece, a bearing inner core base is coaxially arranged in the shielding conductive shell, the bearing inner core base and the shielding conductive shell are connected through a compensation assembly, and the bearing inner core base is composed of a structure with two large cylinders at the two ends and a small cylinder in the middle. And an optical fiber insertion core assembly is coaxially arranged in the bearing inner core seat. By adopting the structure and the manufacturing method, the electromagnetic absorption layer is arranged between the outer wall of the bearing inner core seat and the shielding conductive shell, and high-frequency electromagnetic waves entering the shell are absorbed and attenuated by using a ferrite or carbon nanotube composite wave-absorbing material, so that electromagnetic reflection and secondary interference are reduced, and the overall anti-interference performance is improved.

The present invention discloses a preparation method of an electromagnetic shielding material and the electromagnetic shielding material, which comprises the following steps: sequentially performing electroless nickel plating and electroless copper plating on a plant fiber fabric to obtain a fabric with double-layer coating; coating a polydimethylsiloxane solution on both the front and back sides of the fabric with double-layer coating, and drying to obtain the electromagnetic shielding material; the inner layer of the fabric with double-layer coating is a nickel coating layer, and the outer layer is a copper coating layer. The electromagnetic shielding material of the present invention can effectively reduce the electromagnetic reflection loss, enhance the electromagnetic absorption loss, is beneficial to the absorption and conversion of electromagnetic energy, and avoids the secondary pollution of electromagnetic waves.

The invention belongs to the technical field of road surface detection, and relates to a multi-dimensional radar map construction method based on electromagnetic signals, which comprises the following steps: S1, scanning a target area through high-frequency three-dimensional ground penetrating radar equipment, acquiring electromagnetic reflection signals, and preprocessing the acquired signals; s2, converting the time domain data of the preprocessed electromagnetic reflection signal into spatial domain data, and generating a three-dimensional data model; s3, blank data in the three-dimensional data model are complemented through an interpolation method, and high-resolution three-dimensional grid data are generated; s4, extracting a disease area based on a reflection intensity threshold value and performing type identification; and S5, constructing a three-dimensional disease visualization model, and mapping disease characteristic parameters by adopting color coding. According to the method provided by the invention, the depth resolution and the spatial positioning precision of disease detection are improved, and the real distribution and form of the diseases in the pavement can be reflected more comprehensively.

An antenna system, comprising: an omni-directional antenna element; and a directional adapter having an electromagnetic reflector. The directional adapter detachably coupled to the omni-directional antenna element. The electromagnetic reflector being offset from the omni-directional antenna element. The directional adapter may be configured to be coupled to the antenna to convert a radiation pattern from an omni-directional antenna radiation pattern to a directional antenna radiation pattern, and configured to be decoupled from the antenna to convert the radiation pattern back into the omni-directional antenna radiation pattern.

The application discloses a microwave intrusion detector testing system, method, equipment, medium and product, and relates to the technical field of nuclear security physical protection effectiveness testing. The system comprises a robot moving device, which is used for carrying a testing tool and a central control module, and performing a preset test motion track in a test site. The testing tool comprises a microwave reflector simulation unit, a posture monitoring module and a signal source unit, which are respectively used for simulating electromagnetic reflection characteristics, collecting real-time posture data of the microwave reflector simulation unit and transmitting microwave signals. The central control module is used for controlling the robot moving device and the testing tool, and sending the acquired test data to a data analysis module. The data analysis module is in communication connection with the central control module, and is used for analyzing the test data acquired by the central control module and generating a test report. Therefore, the application improves the accuracy of the test result of the microwave intrusion detector.

The present invention relates to a method for performing a verification test on a radar level gauge system and a radar level gauge system for determining a filling level of a product in a storage tank, wherein the radar level gauge system is arranged to determine the filling level of the product in the storage tank. The method comprises the following steps: transmitting an electromagnetic transmission signal towards the surface of the product in the storage tank; receiving an electromagnetic reflection signal generated by reflection of the transmission signal at the surface of the product; forming a measurement representation based on the transmission signal and the reflection signal, the measurement representation comprising surface echo information indicating the filling level of the product; adding verification test echo information indicating a predefined verification test level to the measurement representation, thereby generating a modified measurement representation; processing the modified measurement representation to determine the verification test level based on the modified measurement representation; and providing a signal indicating the result of the processing.

The film is of a layered structure, the middle of the film is an organic base material, the base material comprises a first surface and a second surface, and a transition layer, an electromagnetic absorption layer, an isolation layer, an electromagnetic reflection layer and a thermal radiation reflection layer are sequentially distributed on the first surface and the second surface. Meanwhile, penetrating through holes are distributed in the surface of the film, and conductive layers are attached to the inner walls of the through holes to communicate all the layers. The thin film utilizes the closed reflection effect of the electromagnetic reflection layer and the loss effect of the electromagnetic absorption layer, and the electromagnetic shielding effectiveness of the thin film in the wave band of 10 MHz to 10 GHz is larger than 80 dB; the hemispherical emissivity of the heat radiation reflecting layer on the outermost layer is 0.03-0.05, and the solar absorptivity is 0.09 + / -0.02. The preparation method of the thin film comprises the steps of substrate plasma modification, magnetron sputtering deposition of the multi-layer functional film, punching, vacuum evaporation plating of the heat radiation reflecting layer, annealing treatment and the like, and the process controllability is high. The thin film integrates the functions of electromagnetic shielding, thermal control, static prevention and heat dissipation, and has important application value in the field of aerospace equipment.

The invention provides an unmanned aerial vehicle communication protocol feature classification method and system based on artificial intelligence, electronic equipment and a storage medium, and relates to the technical field of unmanned aerial vehicle cluster communication and networking. Calculating signal propagation angles of adjacent unmanned aerial vehicles to generate coverage included angle distribution, and calculating electromagnetic reflection path loss to generate a multipath effect correction factor; constructing a polyhedral structure, determining an actual communication coverage center according to the geometric center and the offset of the polyhedral structure, and calculating a three-dimensional offset vector; inputting the vector, the coverage distribution data and the correction factor into a path planning neural network, comprehensively evaluating electromagnetic interference, node displacement and a reflection path, and then outputting a protocol feature classification result; the data is decomposed into feature subsets through a fixed standby node rule, and the feature subsets are transmitted in parallel through multiple relay nodes and recombined at a receiving end, so that the communication anti-interference and transmission reliability in a complex environment can be remarkably improved.

The invention discloses a high-precision electromagnetic detection device, which belongs to the technical field of radiation emission testing and comprises a movable base, a mast is arranged on the upper surface of the movable base, a linear module is vertically arranged in the mast, a fixing plate is mounted on the surface of a sliding table of the linear module, and an antenna assembly is mounted on the upper surface of the fixing plate. By arranging the antenna assembly, the physical length of the antenna can be dynamically adjusted, half-wavelength resonance conditions of different test frequency bands can be matched in real time, dynamic impedance matching is achieved in continuous scanning, polarization switching can be completed through electric control in the static state of the physical structure by arranging the horizontal polarization unit and the vertical polarization unit, and the test efficiency is improved. Cable abrasion, phase instability and vibration interference caused by mechanical rotation are avoided, the measurement consistency is guaranteed, rapid complete polarization scanning is supported, the test efficiency and precision are effectively improved, electromagnetic reflection interference can be restrained through annular scattering ribs arranged on the surface of the mast, and the measurement accuracy is further enhanced.

The invention relates to the technical field of photoelectric materials, in particular to an electromagnetic and infrared compatible flexible film material which is formed by sequentially arranging five layers of materials, and the five layers of materials sequentially comprise a metal film layer, an electromagnetic absorption layer, an electromagnetic transition layer, an infrared base film layer and an infrared low-emission layer from bottom to top. The electromagnetic / infrared compatible flexible film material prepared by the method provided by the invention is thin in thickness, light in weight and good in weather resistance, and is very suitable for reducing electromagnetic reflection and keeping low infrared emission performance at the same time.

The present invention discloses a calculation method for the reflection and propagation of electromagnetic waves in a U-shaped roadway, including: Step S1, constructing an electromagnetic reflection model of the U-shaped mine roadway by using the mirror image method; Step S2, obtaining effective reflection points by the mirror image method according to the electromagnetic reflection model of the U-shaped mine roadway; Step S3, obtaining effective reflection paths by the mirror image method according to the effective reflection points; Step S4, obtaining the reflection field strength distribution of each point in the path according to the effective reflection paths. By adopting the technical solution of the present invention, the problem that the calculation of electromagnetic wave conduction becomes more complicated due to the multiple reflections and diffractions of electromagnetic waves in the U-shaped mine roadway is solved.

According to the composite bamboo pipe, a modified round bamboo pipe subjected to interface modification and pore in-situ foaming filling treatment serves as a bearing framework, the outer layer is annularly restrained through a glass fiber layer (an electromagnetic impedance matching layer), and the inner layer is rigidly supported through a carbon fiber layer (an electromagnetic reflection back plate layer); the structure has a mechanical bearing function and an electromagnetic absorption function, and from the perspective of mechanics, an annular restraint layer, a bearing framework and an internal rigid supporting layer are formed from outside to inside, so that the rigidity of the whole composite bamboo pipe is greatly improved, and the composite bamboo pipe is suitable for being applied to different fields; from the perspective of electromagnetism, the impedance matching layer, the loss layer and the conductive reflection back plate are formed from outside to inside, and therefore the integrated round bamboo composite pipe integrating the mechanical bearing function and the electromagnetic stealth function is formed.

The invention belongs to the technical field of intelligent power grids, and particularly relates to an intelligent substation RIS sensing and communication integrated system and method and electronic equipment, and the system integrates wireless communication optimization, equipment state monitoring, environment sensing and intelligent control. The system comprises a plurality of RIS units capable of independently regulating and controlling electromagnetic reflection characteristics, and each RIS unit is integrated with an embedded multi-physical field sensor. The communication perception fusion control module is in communication connection with the RIS array module and is used for jointly processing the wireless channel state information and the sensor monitoring data and generating an RIS regulation and control instruction; and the dynamic reflection regulation and control module is used for regulating the phase distribution and the reflection beam direction of the RIS unit in real time according to the regulation and control instruction so as to realize cooperative control of communication quality optimization and equipment state perception. The method plays an important role in improving the intelligent level of the transformer substation, enhancing the safety and reliability of the transformer substation, optimizing the operation management of a power grid, promoting the development of an intelligent power system and the like.

The present invention discloses a liquid metal reconfigurable metasurface and a manufacturing method thereof. The liquid metal reconfigurable metasurface includes a sealing layer, a flexible dielectric layer, a driving and control layer, and an electromagnetic reflection layer. The sealing layer, the flexible dielectric layer, the driving and control layer, and the electromagnetic reflection layer are stacked in sequence. A plurality of microchannel structures are arranged in an array on the flexible dielectric layer. The microchannel structures have flow channels for liquid metal to flow. The electromagnetic reflection layer is used for reflecting electromagnetic waves, and the driving and control layer is used for controlling the flow position and shape of the liquid metal in the flow channels; wherein, the shape of the flow channel of each microchannel structure is a shape similar to a Chinese character '田' (field). Through the reversible continuous flow control of liquid metal in the microchannel structures with a shape similar to a Chinese character '田' (field), the present invention realizes the continuous dynamic reconfiguration of electromagnetic response frequency, achieves polarization conversion with S, C, and X broadband response capabilities, the continuous reconfiguration bandwidth is greater than 7 GHz, and has polarization insensitivity, incident angle insensitivity, and flexibility capabilities.

The present subject matter disclosed herein relates to a radio frequency identification (RFID) device and manufacturing system are disclosed. The RFID device includes an antenna configured to operate at a predetermined frequency, a ground plane, and a dielectric spacer positioned between the antenna and the ground plane. The dielectric spacer has a thickness and dielectric constant configured to maintain the predetermined frequency and sensitivity of the antenna when the RFID device is in proximity to items containing high dielectric constant materials. An electrical connection between the antenna and the ground plane is formed, with the ground plane shielding the antenna from electromagnetically reflective surfaces. The manufacturing system includes supply mechanisms for the antenna, dielectric spacer, and ground plane, and a connection mechanism to form the electrical connection. A method of manufacturing the RFID device is also provided, involving positioning the components and forming the electrical connection.

A semiconductor structure includes a first shallow trench isolation (STI) structure within a semiconductor substrate. The first STI structure includes a buffer structure, an adhesion structure, an electromagnetic reflection structure, and a fill structure. The adhesion structure is between and adhesively bonded to the buffer structure and the electromagnetic reflection structure. The electromagnetic reflection structure is between the adhesion structure and the fill structure to reflect electromagnetic radiation.

The invention discloses a heat dissipation electromagnetic shielding film for spaceflight and a preparation method thereof, the prepared film is of a multi-layer structure, and a transition layer, an electromagnetic absorption layer, an isolation layer, an electromagnetic reflection layer and a thermal radiation reflection layer are sequentially arranged on a first surface of a base material; an electromagnetic reflecting layer, a heat radiation reflecting layer, a heat radiation layer and an anti-static layer are sequentially arranged on the second surface of the conductive base material; through holes are distributed in the surface of the electromagnetic shielding film; metal coatings are attached to the inner walls of the through holes, and all layers of the thin film are communicated through the metal coatings. The anti-static layer is prepared by sequentially sputtering the electromagnetic reflecting layer on the second surface of the base material, depositing the thermal radiation reflecting layer through vacuum evaporation, then coating the thermal radiation layer and curing, and coating conductive liquid or in a magnetron sputtering mode. The second surface of the electromagnetic shielding film has low solar absorptivity and high hemispherical emissivity, the solar absorptivity is less than or equal to 0.40, the hemispherical emissivity is not less than 0.60, and the electromagnetic shielding film has a good heat dissipation function and adapts to harsh application scenes in the aerospace field.

Radar sensors are disclosed. A radar sensor includes an antenna layer having antenna elements and a compound radome including an absorber layer on top of the antenna layer and a cover layer on top of the absorber layer. The absorber layer has a higher electromagnetic absorption than the cover layer. The compound radome includes a primary region in which the absorber layer has a reference absorber thickness and the cover layer has a reference cover thickness, and a secondary region in which the absorber layer has a secondary absorber thickness and the cover layer has a secondary cover thickness. The secondary cover thickness is different than the reference cover thickness. For a first angle of incidence, electromagnetic reflectivity is at a minimum within the primary region, and for a second angle of incidence different than the first angle of incidence, electromagnetic reflectivity is at a minimum within the secondary region.

The invention relates to the technical field of water resource management, in particular to a water quality regulation and ecological control system based on intelligent sensing, which comprises a pressure water depth detection module, an acoustic signal analysis module, a layered temperature calculation module, a water quality state judgment module and an ecological control instruction generation module. According to the method, continuous water depth coordinates are constructed through the relationship between pressure change and density, water body density space distribution is formed by combining electromagnetic reflection signal frequency domain characteristics, the vertical layering state of a water body is clearly expressed, temperature data are mapped and corrected under the density constraint condition, and a layering water temperature target with space directivity is formed. The water quality ecological state judgment is completed by combining the temperature gradient and the dissolved oxygen deviation, and a differential adjustment strategy is generated according to the abnormal region position and the risk weight, so that layered and partitioned accurate intervention is realized, the matching degree of the adjustment measure and the actual water body state is enhanced, and the continuity and controllability of water environment management are improved.

A low scattering turntable for improving quiet zone test performance and a quiet zone test method is provided, and relates to the technical field of quiet zone test. The low scattering turntable includes an L-shaped baffle, a rhombic inclined wedge supporting column, a bottom plate, a turntable base, a fixed block, a longitudinal rotating shaft and a transverse rotating shaft. In the disclosure, the rhombic inclined wedge supporting column is adopted, the sharp wedge diffraction and traveling wave scattering effects are reduced. Multi-layer side wave-absorbing materials layout are used in the rhombic inclined wedge supporting column, which can effectively reduce electromagnetic reflection and scattering in a wide frequency range. By adding sawtooth wave-absorbing material to the edge of L-shaped baffle, the reflection intensity of electromagnetic wave is reduced and the overall wave-absorbing efficiency is improved. The oval bottom plate is adopted to reduce the measurement error.

Disclosed and described herein are systems, methods and device for drone-based multi-physics measurement and acquisition wherein a drone flies above samples to rapidly acquire a large volume of data (standard photos, multispectral images, acoustic reflection data, and electromagnetic reflection data, among others). By integrating data acquired by the conventional camera, multispectral camera, acoustic / electromagnetic systems, and other sensor systems, accurate information on lithology, composition, elastic properties, and the like of the samples can be obtained without the need for time-consuming manual analysis.

The invention discloses an aramid nanofiber-based gradient structure composite electromagnetic shielding material and a preparation method thereof, and belongs to the technical field of electromagnetic shielding materials. Comprising an impedance matching layer, an electromagnetic absorption layer and an electromagnetic reflection layer which are stacked from top to bottom; wherein the material of the impedance matching layer comprises aramid nanofiber and Fe3O4; the electromagnetic absorption layer is made of aramid nanofibers and carbon nanotubes; and the electromagnetic reflecting layer is made of aramid nanofibers, polypyrrole and carbon nanotubes. According to the invention, an aramid polymer solution is used as an adhesive and gradient structure design is carried out, a magnetic material is introduced to promote electromagnetic wave incidence and reduce surface reflection, efficient attenuation of electromagnetic waves is realized through a continuous conductive network constructed by carbon nanotubes, and a strong reflection layer is formed by polypyrrole coated aramid nanofibers with a core-shell structure and the carbon nanotubes, so that the electromagnetic wave attenuation is improved. Therefore, the problems of poor mechanical property and insufficient electromagnetic shielding property of the composite electromagnetic shielding material are solved.

The invention discloses a self-sensing electromagnetic reflection scattering response regulation and control device and method, and the device comprises a reconfigurable electromagnetic metasurface which comprises a plurality of metasurface units which are arranged at intervals, and each metasurface unit achieves the reflection phase adjustment of the metasurface unit through the flowing position of liquid metal in a micro-channel; the reconfigurable planar antenna comprises a plurality of antenna units, and the antenna units realize the frequency and directional diagram reconstruction of the antenna through the flowing position of the liquid metal in the micro-channel; and the driving control unit is used for generating a coding sequence of the reconfigurable electromagnetic metasurface according to the incident wave electromagnetic parameters sensed by the reconfigurable planar antenna and driving liquid metal in the reconfigurable electromagnetic metasurface to flow according to a position state corresponding to the coding sequence. According to the invention, the frequency and direction of incident electromagnetic waves are sensed by the reconfigurable planar antenna, real-time coding adjustment of the metasurface array is realized, and then adaptive electromagnetic reflection and scattering adjustment is realized.