18 results about "Radiation scattering" patented technology

The invention provides an electron irradiation dose on-line measurement and feedback calibration system and method, and relates to the technical field of automation control, and the system comprises a processing module which is used for converting an original dose signal into a five-path digital reading sequence, carrying out the timestamp alignment and space coordinate calibration of the five-path digital reading sequence, and outputting a calibration result; generating a three-dimensional discrete coordinate data set representing radiation field intensity space distribution; and the extraction module is used for identifying a radiation intensity global maximum value point from the three-dimensional discrete coordinate data set as a spatial registration origin, extracting two feature straight lines representing a radiation scattering dominant direction, and calculating a spatial orientation included angle between the two feature straight lines to determine a radiation scattering main influence area. According to the invention, precise processing of an original dose signal, scientific positioning of a radiation influence area and construction of a dynamic compensation model are realized through cooperation of multiple modules, a high-confidence dose value can be output, feedback calibration is completed based on a time sequence drift trend, and the precision and reliability of on-line measurement of the electron radiation dose are effectively guaranteed.

The invention provides a space-based full-link photoelectronic imaging simulation method based on CUDA (Compute Unified Device Architecture), and solves the problems of complicated calculation, insufficient simulation precision and high hardware requirements in the prior art. The method comprises the following steps: dividing the surface of a target three-dimensional model into triangular surface elements and calculating target intrinsic radiation scattering data of each surface element; generating background intrinsic radiation scattering data in real time through CUDA (Compute Unified Device Architecture) parallel calculation according to the space-time spectrum parameters and the earth surface / cloud layer / limb basic model library; calculating characterization radiation before entrance pupil based on target and background intrinsic data; the entrance pupil radiation is converted into a detector voltage signal through CUDA parallel optimization, and a gray infrared simulation image is generated. According to the method, the calculation efficiency is remarkably improved, and space-based full-link photoelectric imaging simulation with high authenticity and real-time performance is realized.

The invention discloses a radiation and scattering integrated microstrip antenna based on an artificial magnetic conductor, and belongs to the technical field of microwave antennas. The antenna comprises a microstrip antenna, four first artificial magnetic conductor (AMC) arrays and four second AMC arrays, the microstrip antenna is located in the center, and the four first AMC arrays and the four second AMC arrays are distributed on the periphery in a chessboard structure mode. Compared with the original microstrip antenna, the radiation-scattering integrated microstrip antenna based on the artificial magnetic conductor has the advantages that the antenna bandwidth is basically unchanged, the gain of the antenna is improved, and the radiation performance of the original radiation antenna is not influenced; the RCS of the antenna is effectively reduced in a broadband, the overall profile is low, and the antenna can be used in the fields of modern wireless communication systems, electronic reconnaissance and confrontation and the like.

The application relates to the technical field of antennas and electromagnetic stealth, and particularly discloses a low-scattering antenna array based on an artificial magnetic conductor structure, which comprises an upper dielectric layer, an air layer and a lower dielectric layer arranged in sequence from top to bottom; a plurality of groups of patch units A and a plurality of groups of patch units B are arranged in an array on the upper surface of the upper dielectric layer; each group of patch units A comprises a plurality of groups of slotted cut patch units arranged periodically and having cut seams; each group of patch units B comprises a plurality of groups of common patch units arranged periodically; an upper microstrip feed line strip is arranged on the upper surface of the lower dielectric layer; a metal floor is arranged on the lower surface of the lower dielectric layer, the metal floor is provided with a lower strip-shaped gap corresponding to the upper microstrip feed line strip and a coaxial cable connected with the upper microstrip feed line strip. The application realizes the radiation and scattering integrated antenna array with wideband radiation performance and wideband low-scattering performance by the mechanism of the artificial magnetic conductor orthogonal reflection screen which utilizes the interference cancellation of reflected wave phase difference.

The application provides a kind of radiation scattering integrated array antenna and mounting method, belongs to array antenna technical field, solve some problems existing in traditional antenna RCS reduction technology;The application includes antenna radiator, feed component, power division layer and mounting bottom plate, the structure of the antenna radiator adopts band-stop FSS structure, the band-stop FSS structure is used to show band-stop characteristic in antenna operating frequency band;The feed component is used to make the antenna radiator and the power division layer vertical interconnection, the mounting bottom plate is used to carry the power division layer;The FSS structure that shows band-stop characteristic in antenna operating frequency band is used as antenna radiator in the application, and the array, feed and mounting mode of such antenna radiator are given, both the radiation of antenna and the effect of shielding in-band electromagnetic wave are realized in antenna operating frequency band, so as to reduce the scattering of antenna structure to in-band radar wave.

This application relates to photoresist compositions. Specifically, it relates to photoresists that can be used in photolithography, particularly in the manufacture of integrated circuits and derivative products. The photoresist compositions of this application include anti-scattering components with a significant amount of porosity and therefore fewer scattering centers, thereby further limiting radiation scattering events during exposure. This anti-scattering effect can improve resolution by reducing common proximity effects associated with photolithography, thus allowing the fabrication of smaller, higher-resolution microchips. Furthermore, some embodiments include anti-scattering components directly linked to the photoresist components, which can improve overall photolithography chemistry, thus providing benefits in both resolution and photoresist sensitivity.

The invention provides a preparation method of a dust-free high-performance heat insulation board, which comprises the following steps: firstly, preparing an A-layer skin barrier film, and forming an elastic barrier film through coating and curing; secondly, preparing a C-layer backing reinforced prefabricated body, and compounding a fiber reinforced base material and a hot melting bonding component by utilizing a hot pressing technology; then, preparing a B-layer heat insulation core layer, compounding ZrO2 particles through aerogel matrix synthesis and functionalization treatment to improve the radiation scattering capability, and realizing a self-repairing function through an epoxy / anhydride reaction pair; and finally, assembling the three layers in a laminating manner and performing hot-pressing composite molding. According to the method, an aerogel matrix is compounded with ZrO2 particles, so that the heat conductivity is effectively reduced, the heat insulation performance is improved, and the material is endowed with good radiation isolation capability and a self-repairing function. The heat insulation plate is obviously superior to a traditional heat insulation material, has high long-term stability and reliability and is suitable for the field of high-temperature equipment with strict requirements.

This invention provides a system and method for online measurement and feedback calibration of electron irradiation dose, relating to the field of automation control technology. It includes: a processing module for converting the raw dose signal into a five-channel digital reading sequence, and performing timestamp alignment and spatial coordinate calibration on the five-channel digital reading sequences to generate a three-dimensional discrete coordinate dataset characterizing the spatial distribution of radiation field intensity; and an extraction module for identifying the global maximum radiation intensity point from the three-dimensional discrete coordinate dataset as the spatial registration origin, extracting two characteristic lines characterizing the dominant radiation scattering direction, and calculating the spatial azimuth angle between the two characteristic lines to determine the main influence area of ​​radiation scattering. This invention achieves accurate processing of the raw dose signal, scientific positioning of the radiation influence area, and construction of a dynamic compensation model through multi-module collaboration. It can output high-confidence dose values ​​and complete feedback calibration based on time-series drift trends, effectively ensuring the accuracy and reliability of online electron irradiation dose measurement.

The invention relates to a metasurface Fabry-Perot resonant cavity antenna with a tunable RCS (radar cross section). The metasurface Fabry-Perot resonant cavity antenna sequentially comprises a coaxial line feed structure, a metal reflection bottom plate, a lower dielectric substrate, a middle air layer and a partial reflection layer dielectric substrate from bottom to top, the lower dielectric substrate is integrated with a square patch array and a central radiation structure, and coaxial line feed is coupled with the lower dielectric substrate; a metasurface array and a pin tube are arranged on the upper surface of the partial reflection layer substrate, a partial reflection layer patch array is arranged on the lower surface of the partial reflection layer substrate, and the middle air layer, the reflection bottom plate and the partial reflection layer form a Fabry-Perot resonant cavity. The 0-300 ohm dynamic impedance regulation RCS is realized through the radial pin tubes, and the radiation performance is prevented from being influenced by the design that no pin tube is arranged in a central region. According to the design, the RCS reduction amount is continuously adjustable in the frequency band of 6-12 GHz, the height of the antenna is reduced by 40%, the problems of RCS fixation and radiation scattering conflict of a traditional antenna are solved, and the stealth adaptability and survivability of equipment are improved.

The utility model provides a kind of low RCS metasurface antenna of radiation scattering integration belongs to microwave antenna technical field, including from top to bottom sequentially arranged radiation scattering integrated metal structure, varactor diode loaded on radiation scattering integrated metal structure, first dielectric substrate, metal ground plane, second dielectric substrate and microstrip transmission line, radiation scattering integrated metal structure, metal ground plane and microstrip transmission line cooperate to realize radiation, radiation scattering integrated metal structure and varactor diode cooperate to realize scattering regulation and control.The antenna designs metasurface scattering unit and antenna radiation patch under the same aperture plane, realizes good radiation performance and scattering regulation and control performance;By adjusting the capacitance of varactor diode, the reflection phase when metasurface antenna unit is used as scatterer is regulated and controlled.By reasonable array arrangement, the in-band main polarization RCS when antenna array is terminated with matching load can be further reduced.

The application discloses a low-scattering array antenna based on a dual-function unit and a cooperative array design, belongs to the technical field of array antenna stealth design, and is formed by cooperatively arranging reference array units and dual-function units to form a 4*4 two-dimensional array antenna, which has four rows along the same polarization direction; wherein, the first row and the fourth row are each provided with four dual-function units, and the second row and the third row are each provided with four reference array units. The reference array unit comprises, from top to bottom, a radiation patch, a dielectric layer and a metal ground plate; the dielectric layer is provided with an L-shaped feeding structure. The difference between the dual-function unit and the reference array unit is that the radiation patch of the dual-function unit is provided with three straight slits parallel to each other, and the straight slits penetrate through the radiation patch. The array antenna designed by the application has the advantages of radiation scattering integration and wide-band dual-polarization low scattering, and can meet the stealth requirement.

This invention relates to the field of quality control technology for medical linear accelerators, specifically an integrated MLC QA method based on fence testing. The method includes: acquiring fence test images; establishing a beam radiation scattering library to store the radiation scattering amount corresponding to each MLC leaf pair in each strip; selecting the corresponding radiation scattering amount from the scattering library based on the strip width and spacing, and subtracting it from the image pixel values ​​to partially eliminate inter-strip beam radiation scattering; extracting algorithm parameters from the pixel value profile curve after radiation scattering elimination; and substituting the algorithm parameters into a pre-generated fitting function to calculate the actual gap or physical position of the MLC leaf. This invention partially eliminates inter-strip radiation scattering interference by establishing a beam radiation scattering library, and combines multiple algorithm parameters for leaf position detection, improving the accuracy and robustness of MLC quality assurance. It also solves the problem that existing half-peak height-width ratio (WHM) methods are susceptible to pixel value instability and inter-strip beam radiation scattering.

The invention discloses a high-gain in-band low-scattering multi-port circularly polarized patch antenna based on four-mode resonance, and relates to the technical field of antennas. The antenna comprises a radiation patch, a dielectric substrate and a metal floor which are sequentially laminated, the radiation patch and the metal floor are connected by penetrating through the dielectric substrate through two rows of mutually orthogonal metal short circuit columns; four gap grooves which are orthogonal in sequence are loaded on the radiation patch along the diagonal direction; and feed ports are arranged on four regions divided by the radiation patch based on the two rows of mutually orthogonal metal short circuit columns. According to the invention, the in-band scattering reduction and gain improvement of the circularly polarized antenna are realized at the same time by utilizing the excitation difference of four modes under radiation and scattering conditions.

The application discloses a kind of based on super surface's radiation scattering integrated antenna structure, including the basic structure unit of two layers of dielectric layer and three layers of metal layer, dielectric layer is by first dielectric layer and second dielectric layer from top to bottom distribution;Metal layer is from top to bottom respectively the super surface scattering and radiation layer of first metal layer, the copper column layer and direct current bias layer of second metal layer, the metal ground layer of third metal layer;The super surface scattering and radiation layer has scattering function and radiation function, copper column layer and direct current bias layer provide voltage difference and excitation for super surface;Metal ground layer is as the floor layer of entire antenna;Super surface is by n×n basic structure unit copy translation composition.The application can let RCS under the irradiation of different incident waves realize the effect of reduction.The radiation and scattering characteristics of the proposed digital metasurface array are independent of each other and can be flexibly controlled respectively.

This invention discloses a method and apparatus for simulating multi-source signals integrating radiation and scattering of high-speed moving targets, relating to the field of radio frequency simulation technology. It is applicable to anechoic chamber multi-sensor radio frequency simulation scenarios. The method includes: configuring the motion, scattering, and radiation characteristics of a high-speed moving target; calculating the angle and distance parameters required for target simulation; generating target scattering signals and multi-channel radiation signals; real-time adjusting the type and transmission power of the radiation signals; and controlling the synchronous output of scattering and radiation signals at the same simulation angle. This invention can achieve synchronous simulation of multi-source signals integrating radiation and scattering of high-speed moving targets, improving the dimensionality and realism of target simulation, adapting to multi-sensor collaborative testing scenarios, and solving the problem of insufficient adaptability of existing simulation schemes to multi-sensor testing. It has good application value.

The invention belongs to the technical field of materials, and particularly relates to a heat insulation coating of a drill rod and a preparation method of the heat insulation coating. 13 to 17 parts of hollow mullite microspheres; 10 to 14 parts of magnesium titanate-silicon carbide composite powder; 6 to 10 parts of silane modified aerogel powder; 6 to 8 parts of mullite whisker; 7 to 9 parts of NiCrAlY alloy powder; the zirconium oxide-mullite composite powder and the hollow mullite microspheres form a high-temperature stable porous matrix, crystalline phase transformation is avoided, the porosity of 30%-35% is maintained, and solid heat conduction is blocked; magnesium titanate-silicon carbide composite powder synergistically scatters and absorbs infrared radiation and inhibits the high-temperature thermal radiation heat transfer proportion, in the preparation method, plasma spraying parameters are accurately controlled, coating crystal phase transformation and aerogel sintering are avoided, and it is guaranteed that the coating is stable in high-temperature structure; the porosity and the infrared shading performance of the coating are not influenced by low-temperature annealing post-treatment, so that the heat conductivity coefficient of the heat insulation coating in the interval of 500-1000 DEG C is stabilized at 0.3-0.5 W / (m.K).

The application discloses a switchable film capable of radiative cooling and photothermal heating and a preparation method and application thereof. The switchable film comprises, from top to bottom, a scattering layer, a PDMS film layer and a photothermal heating layer. The scattering layer is a PE film doped with nano zinc oxide. The photothermal heating layer is a PE film doped with carbon black. The switchable film can realize switching between radiative cooling and photothermal heating, solves the phenomenon of supercooling of a traditional radiative cooling device in winter, separates radiative cooling and solar radiation scattering, minimizes the influence of heat convection and heat conduction on the radiative cooling device, and improves the actual radiative cooling effect of the device. The film device has the advantages of simple structure, simple preparation method, low cost, good chemical stability and the like, and has a bright application prospect in textile clothes, building materials and the like.

This invention relates to the field of medical bed technology, specifically a tumor radiotherapy bed with a protective structure. The main bed board has two adjustment slots at its bottom. A supporting column is slidably engaged within each adjustment slot. A supporting top block is fixedly connected to the outer side of each supporting column. A connecting base plate is fixedly connected to the bottom of each supporting top block. Sliding groove plates are fixedly connected to both sides of the connecting base plate. Side inner sliding columns are slidably engaged within each sliding groove plate. A side bottom block is fixedly connected to the outer side of each side inner sliding column. A supporting rotating plate is fixedly connected to the bottom of each side bottom block. This design is structurally sound and easy to operate. The bed height and angle are flexibly adjustable, facilitating precise alignment with the radiation irradiation position. The protective components can be adapted to precisely shield lesions, effectively reducing radiation scattering damage to normal tissues. Combined with head fixation and body straps, it enhances positional stability, improving treatment safety while ensuring treatment effectiveness.