371 results about "Linear polarization" patented technology

The invention relates to the technical field of cloth dyeing uniformity detection, in particular to a cloth dyeing uniformity detection method and system based on image analysis, and the method comprises the steps: building a three-dimensional optical response model according to the optical characteristics of a fluff cloth fiber material; calculating to obtain a villus shadow intensity distribution diagram according to the linear polarization degree image data, and calculating to obtain a theoretical artifact reflectivity distribution diagram through a three-dimensional optical response model according to the villus shadow intensity distribution diagram and the surface normal vector mapping data; extracting an actual measurement reflectivity distribution diagram from the hyperspectral image data, and performing differential operation on the actual measurement reflectivity distribution diagram and the theoretical artifact reflectivity distribution diagram to obtain a real dyeing component diagram; dividing villus unit grids on the real dyeing component graph, and calculating a spectral fingerprint variance value of pixels in each villus unit grid; and when the spectral fingerprint variance value exceeds a preset process tolerance threshold value, judging that the corresponding fluff unit grid has a real dyeing defect. And the identification precision of the dyeing defects of the fluff cloth is effectively improved.

The invention discloses a pavement disease high-precision identification method and system based on multi-scale feature fusion, relates to the technical field of road inspection multi-source vision and intelligent identification, and is used for solving the problem of realizing stable image acquisition, strong binding supervision and high-precision disease identification under tail-flow speckles and cross-domain disturbance. Three ends of a vehicle, an unmanned aerial vehicle and a ground site are synchronously collected, time and geometric alignment is completed, the vehicle is put in storage in a quaternary binding mode, corridor route lateral overlapping and linear polarization light control are matched, and positioning and posture tracks are recorded; triggering a micro time window frame cluster in a tail-flow speckle scene, collecting shear reciprocal and phase inversion images, constructing convection discrimination and a mask, executing directional line integration and reverse displacement compensation to obtain an image-stabilized image, and performing gating continuous collection by a coherent image-stabilized score; and then standardized cleaning, multi-scale augmentation, semi-automatic labeling and consistency checking are carried out, a multi-scale feature pyramid is constructed, three-path decoding is carried out, cross-domain training and model compression are combined, and a unified result and a rule list are output.

The invention relates to the technical field of leaf nitrogen content estimation, in particular to a method for establishing a grassland plant nitrogen content monitoring model based on a remote sensing technology. The method comprises the following steps: controlling an unmanned aerial vehicle platform carrying a narrowband multispectral camera and a linear polarization camera, and collecting a spectral image sequence and a polarization image group at an observation window with a solar zenith angle of 30-40 degrees; extracting a reflectivity value of each wave band in the spectral image sequence, calculating a reflectivity first-order derivative and determining a red edge position offset; extracting horizontal and vertical polarization components in the polarization image group, calculating a polarization degree and constructing a polarization degree difference index; and identifying the center of the fecal spot by searching a pixel with a local maximum polarization degree difference index and red edge position offset blue shift exceeding a preset threshold value. According to the method, excrement spot recognition and remote sensing description of the nitrogen influence range thereof are achieved through double-index complementation of the red edge position offset and the polarization degree difference index.

The invention discloses a linear polarization scattering reconfigurable array antenna, which belongs to the technical field of antenna manufacturing and comprises an antenna unit, an extension socket, a transmission type phase shifter and an inductor. The antenna unit comprises a radiation patch, a first dielectric substrate, a metal via hole, a metal patch, a second dielectric substrate, a perforated metal floor, a third dielectric substrate, a feed metal column and a radio frequency coaxial connector, the radio frequency coaxial connector is connected with the radiation patch through the feed metal column, and a variable capacitance diode and a capacitor are arranged on the transmission type phase shifter. The transmission type phase shifter is connected with the radiation patch through the feed metal column, the variable capacitance diode is connected with the punching metal floor, the bottom of the third dielectric substrate is provided with a direct current bias line, the direct current bias line is connected with the transmission type phase shifter through the inductor, and the transmission type phase shifter is connected with the radiation patch through the feed metal column. According to the invention, flexible regulation and control of antenna scattering beams can be realized, and the antenna has the characteristics of flexible control, fast response speed and high radiation efficiency.

The invention provides a polarization modulation coupling time control phase locking high-temperature noise suppression in-situ Raman method and device, and relates to the technical field of spectrum detection. The method comprises the following steps: exciting pulse linear polarization laser to irradiate a sample to obtain Raman scattering light; a parallel vibration component (P) and a vertical vibration component (S) are obtained, and original spectral data containing polarization information and residual high-temperature noise are collected by adopting an ISCCD detector synchronously triggered by gating. Background noise is removed and a parallel vibration component (P) is extracted through polarization differential processing in combination with adaptive filtering (dynamically adjusting parameters according to signal distribution) and principal component analysis (PCA); and finally, performing signal-to-noise ratio optimization on the pure component by applying a phase locking algorithm to finally obtain a Raman spectrum result with a high signal-to-noise ratio. According to the invention, the in-situ Raman spectrum of the material within the temperature range of room temperature to 3000 DEG C can be measured, and the detection of weak signals is more sensitive.

The application discloses a Ka dual-circular polarization antenna unit and a flat plate array antenna, which comprises, from top to bottom, a radiation patch layer, a slot coupling layer, a waveguide transmission layer and a feed network layer; a plurality of microstrip line structures are arranged on the radiation patch layer, the microstrip line structure comprises a first microstrip line and a second microstrip line, and the first microstrip line and the second microstrip line form a 90-degree phase difference of electric field orthogonal components; the slot coupling layer comprises a second substrate, the second substrate is provided with a source collapse groove corresponding to the microstrip line structure, and the slot coupling layer and the radiation patch layer are relatively displaced under the action of an external force; the microstrip line structure corresponding to the source collapse groove is switched between a left-handed circular polarization microstrip line and a right-handed circular polarization microstrip line through the relative displacement; and the source collapse groove and the first substrate form a linear polarization feed source. According to the application, each dual-circular polarization feed source is used to form dual-circular polarization, and a polarization partition plate of a feed source waveguide is not relied on, so that the thickness of the antenna structure is reduced.

The invention relates to the technical field of optical image processing, and discloses a global perception and multi-branch heterogeneous attention polarization image fusion method and system, and the method comprises the following steps: obtaining polarization images of four angles, and obtaining a data set containing an intensity image and a linear polarization degree image according to a Stokes vector synthesis method; constructing a global perception and multi-branch heterogeneous polarization image fusion model, and performing training by using the data sets of the corresponding intensity image and the linear polarization degree image to obtain a polarization image fusion model; polarization image fusion is realized by using the polarization image fusion model; according to the invention, while polarization image fusion is accurately realized, perception of polarization features is significantly enhanced, and image details are effectively maintained; meanwhile, by improving the contrast ratio and the brightness of the image, the fused image is clearer and richer in details; in complex scene processing, object edge features and fine light reflection information can be better reserved, and the problem of detail loss in the prior art is effectively improved.

The invention discloses a hematemesis volume intelligent determination method based on image identification and data analysis, and relates to the technical field of artificial intelligence auxiliary diagnosis, and the method comprises the following steps: constructing a spattering phase and spectrum combined observation baseline through a blood spattering imaging sequence, analyzing a light spot transient track through a time-frequency phase-locked calibration mechanism, extracting high-frequency reflection characteristics, and determining the hematemesis volume according to the high-frequency reflection characteristics. Generating a light spot prior set for interference identification; according to the distribution characteristics of the light spot prior set, multi-angle linear polarization image sampling and multi-interval adaptive exposure adjustment are executed, a stable coupling characteristic stack of color characteristics and texture characteristics is constructed, and a unified spectrum reference is provided for track identification processing. By introducing phase-spectrum combined observation, multi-angle polarization sampling and a dynamic regulation and control mechanism, a steady-state feature stack and a track topological graph are constructed, light spot interference stripping and volume fitting stabilization are achieved, the accuracy, real-time performance and robustness of hematemesis volume recognition are improved, and the method has remarkable clinical application value.

The invention relates to the technical field of fringe projection three-dimensional reconstruction, in particular to a point cloud enhancement method and system based on polarization structure perception and trend guided recovery. The method comprises the following steps: acquiring a multi-angle polarization image, and generating an object area mask based on a polarization angle consistency mask, a polarization angle gradient mask and a linear polarization degree mask; obtaining an original phase diagram through four-step phase shift and complementary Gray codes, obtaining a missing region in an object according to hole distribution of the original phase diagram, and adding morphological structure indexes and local variance features to recognize a real self-shadow region; aiming at the identified real self-shadow area, establishing a structure guiding recovery model combining a first-order structure gradient guiding item and a second-order structure gradient guiding item to obtain a complete object point cloud; and separating a background and an invalid shadow in the object point cloud through the object area mask to obtain a point cloud which only retains the object area.

The invention discloses a non-contact polarization image measuring device and method for a large-size PBX curing process. The non-contact polarization image measuring device comprises a three-dimensional sample table, a diaphragm, a zoom lens, a micro-polarization array and a detector which are arranged along a light path direction, a sample to be tested is placed on the three-dimensional sample table, and the center of the sample to be tested coincides with the center of the three-dimensional sample table; the diaphragm realizes normalization processing of emergent light energy by regulating and controlling the intensity of reflected light on the surface of the sample; the zoom lens collects normalized emergent light to the surface of the micro-polarization array, and is adjusted and matched with the z-axis of the three-dimensional sample table to realize scanning imaging of a to-be-detected sample in the depth direction; the detector acquires a linear polarization image. According to the method, the PBX is measured through non-contact polarization, high-precision characterization analysis of the PBX curing process is completed by calculating key parameter (polarization angle and polarization degree) changes caused by curing, and the problems of pollution, large error and high danger of a sample in traditional contact measurement are solved.

The invention discloses a dual-band dual-linear polarization reconfigurable folding transmission-reflection array antenna, which comprises an upper-layer metasurface, a lower-layer metasurface and a feed source antenna, the upper-layer metasurface is provided with 12 * 12 first unit structures, and each first unit structure comprises a first metasurface metal patch, a first dielectric substrate, a second metasurface metal patch, a second dielectric substrate and a third metasurface metal patch which are connected from top to bottom; the lower-layer metasurface is provided with 12 * 12 second unit structures, and each second unit structure comprises an annular gap metal patch, a third dielectric substrate and a bottom-layer feeder line which are connected from top to bottom; two PIN diodes are integrated in an annular gap of the annular gap metal patch, and the annular gap metal patch is connected with a bottom feeder line located on the upper surface of the third dielectric substrate through a feed probe; and a 2 * 2 unit size is reserved in the center of the lower-layer metasurface and is used for placing a feed source antenna. According to the invention, dual-frequency dual-linear polarization bidirectional wave beam scanning is realized, and the low-profile characteristic is realized.

The invention discloses a spectrum polarization detection method based on a quasi-continuous domain bound state metasurface, and belongs to the application field of micro-nano optics and spectrum polarization detection. The implementation method comprises the following steps: adopting a symmetrical broken elliptical amorphous silicon nano-column arrangement mode to obtain a metasurface structure unit with a narrow-band formant, a high-quality factor and linear polarization dependence; the method comprises the following steps: analyzing a change rule of resonance wavelength along with geometric parameters of a structural unit and a change rule of resonance intensity along with a polarization state of incident light through numerical simulation to obtain a series of metasurface structures with different resonance wavelengths and different polarization responses, reasonably arranging the metasurface structures, processing a metasurface sample, and testing a reflection spectrum of the metasurface sample, and the spectrum and polarization response characteristics are calibrated. A spectrum polarization detection system composed of a detection target, a metasurface and a CMOS detector is built, and the spectrum and polarization information of the target is detected based on the spatial position arrangement of the metasurface structure and the Stokes relation by using gray information shot by the CMOS detector.

The invention provides a dual-circularly-polarized feed source assembly and a feed source system. The dual-circularly-polarized feed source assembly comprises four identical horns, a dual-polarized four-path power division and synthesis network and a T-shaped waveguide circular polarizer which are cascaded. The inner wall of the horn adopts an exponential curve structure, the dual-polarization four-path power division and synthesis network comprises a common input waveguide, a frustum mode matching waveguide cavity and four output waveguides, the T-shaped waveguide circular polarizer comprises a stepped gradient waveguide and a rectangular waveguide, the rectangular waveguide and the stepped gradient waveguide are arranged in a T shape, and the rectangular waveguide and the stepped gradient waveguide are arranged in a T shape. The plane where the wide side of the rectangular waveguide is located has a 30-degree rotation angle relative to the propagation cross section of the tapered waveguide. Compact transformation from linear polarization to circular polarization can be realized through T-shaped butt joint of the stepped gradient waveguide and the rectangular waveguide. The dual-circular polarization feed source assembly has good broadband circular polarization performance.

A method and system for optical switching with integrated polarization diversity control comprising a beam displacer to receive an input beam and split the input beam into a first beam and a second beam with linear polarization. The first and second beams may be received on a liquid crystal cell that may rotate the first or second beam so that both beams have the same polarization after traversing the liquid crystal cell. Based on the polarization, the output beam may be switched to a port.

The invention relates to the technical field of ultrafast laser, in particular to an ultraviolet laser damage inhibition method and device for a fused quartz optical element, and the method comprises the steps: obtaining oxy-18 modified DKDP crystals with oxy-18 isotope abundance higher than natural abundance; preparing the oxy-18 modified DKDP crystal into a wave plate matched with a preset ultraviolet laser wavelength; in an ultraviolet laser light path of a laser inertial confinement fusion device, a wave plate is arranged between a linear polarization state output end of ultraviolet laser and a fused quartz optical element; and enabling ultraviolet laser to sequentially pass through the linear polarization state output end and the wave plate to form circularly polarized light, and irradiating the circularly polarized light to the fused quartz optical element. The invention aims to realize the small-scale self-focusing effect of actively inhibiting fused quartz and solve the technical problem that a traditional material cannot be used as a large-aperture wave plate due to over-high transverse stimulated Raman scattering.

The application provides an image generating unit and a display device. The image generating unit comprises a backlight module, a first liquid crystal panel, a second liquid crystal panel and a first polarizer; the first liquid crystal panel comprises a linear polarization structure, a first liquid crystal cell and a second polarizer arranged along the transmission direction of the outgoing light rays of the backlight module; the second liquid crystal panel comprises a second liquid crystal cell and a color filter; at least one of the components in the first liquid crystal panel, the first liquid crystal panel and the second liquid crystal panel, the components in the second liquid crystal panel and the second liquid crystal panel and the first polarizer is provided with an air gap with a preset width. The application uses a double-screen structure, the black-and-white first liquid crystal panel realizes regional dimming, which is beneficial to improving the contrast ratio; the color second liquid crystal panel removes the lower polarizer and is provided with a higher resolution, which is beneficial to improving the display effect; the structures are separated by a distance, the heat can circulate in the air, thereby enhancing the heat dissipation effect and reducing the heat.

A method and system for determining a radiation dose is provided. The method can include receiving at least one polarized signal from a radio-luminescent element and determining a degree of linear polarization and an angle of linear polarization of the at least one polarized signal based on at least one predetermined polarization transmission axis. The system can include a polarization sensitive sensor for capturing at least one polarized signal from a radio-luminescent element; and a processor. The processor can be configured to: receive the at least one polarized signal; and determine a degree of linear polarization and an angle of linear polarization of the at least one polarized signal based on at least one predetermined polarization transmission axis.

The invention discloses an infrared bipolar linearly-polarized photoelectric detector and a preparation method thereof, and the infrared bipolar linearly-polarized photoelectric detector is characterized in that a bipolar material graphene is used as a channel material, a two-dimensional N-type semiconductor material molybdenum disulfide MoS2 and an anisotropic narrow-band-gap two-dimensional material black phosphorus BP are stacked on the bipolar material graphene in sequence, and the two-dimensional N-type semiconductor material molybdenum disulfide MoS2 and the anisotropic narrow-band-gap two-dimensional material black phosphorus BP are stacked on the channel material; the polarity of the graphene is regulated and controlled by the bottom gate, the infrared bipolar linearly polarized photoelectric detector with the bipolar linear polarization detection effect that the light current symbol reversibly turns over along with the polarization direction in the infrared band is achieved, and the infrared bipolar linearly polarized photoelectric detector has the advantages of being simple in structure, easy to regulate and control, capable of remarkably improving polarization recognition precision and the signal-to-noise ratio and the like. The programmable and multifunctional integration potential is also realized.

The application discloses an IMU light path structure based on multiple super surfaces, and the light beam generated by a laser 1 is divided into three mutually perpendicular light beams after the action of a beam splitting super surface 3, and then is converted into circularly polarized light and linearly polarized light by a polarization conversion beam splitting super surface 4, and is used for pumping and detection of a nuclear magnetic resonance gyroscope 5 respectively. The beam splitting super surface 3 is composed of polarization-insensitive cylindrical nanorods, and the incident light is split and corresponding deflection is generated by combining the generalized Snell law. The polarization conversion beam splitting super surface 4 is composed of polarization-sensitive rectangular nanorods and polarization-insensitive cylindrical nanorods, the rectangular nanorods are used for converting linearly polarized light into circularly polarized light, and the cylindrical nanorods maintain the linear polarization characteristics and realize light beam splitting and direction adjustment. The application adopts a single laser configuration, realizes efficient light field regulation and control based on super surfaces, avoids the problem that a traditional IMU light path system depends on multiple lasers, reduces the system volume, complexity and energy consumption, improves the stability and integration, and is suitable for high-precision inertial navigation applications.

The invention provides an ultra-wideband phased array unit antenna with two polarizations, and relates to the technical field of antennas. The ultra-wideband phased array unit antenna with the two polarizations comprises a radiation layer, an upper oscillator patch is formed on the upper surface of the radiation layer, a lower oscillator patch is formed on the lower surface of the radiation layer, the upper oscillator patch comprises a first oscillator patch and a second oscillator patch which are connected with each other and are arranged at an angle of 90 degrees, the first oscillator patch is provided with a first feed part, and the second oscillator patch is provided with a second feed part. The lower-layer oscillator patch comprises a third oscillator patch and a fourth oscillator patch which are connected with each other and are arranged at an angle of 90 degrees; and the third oscillator patch is provided with a second feed part. Wherein the length of the second oscillator patch is larger than that of the first oscillator patch, the length of the fourth oscillator patch is larger than that of the third oscillator patch, and the first oscillator patch, the second oscillator patch, the third oscillator patch and the fourth oscillator patch are all provided with special-shaped grooves. The antenna can realize the characteristics of linear polarization transceiving at a low frequency band and circular polarization transceiving at a high frequency band.

The invention discloses a zero-order-eliminating large-point projector based on a polarization conversion metasurface and a design method thereof, and belongs to the field of optical devices. The zero-order-eliminating large-point projector comprises a linear polarization VCSEL dot matrix light source and a metasurface diffraction device; the metasurface diffraction device comprises a two-in-one metasurface structure layer and a linear polaroid layer. The two-in-one metasurface structure layer collimates and splits incident dot matrix light beams generated by the linear polarization VCSEL dot matrix light source at the same time through superposition collimation phase distribution and Dammann light splitting phase distribution, and large-point copying and splicing of the incident dot matrix light beams in a far field are achieved. The linear polaroid layer carries out cross polarization modulation on light beams, so that the polarization states of modulated light and incident light are orthogonal, zero-order light which is not modulated is filtered out, and therefore the problem that a large-point-number two-in-one projector is seriously affected by zero order is solved. The system is compact in structure and low in installation and adjustment cost, interference of zero-order light is inhibited in principle, and the system is suitable for meeting the requirements of thousands to tens of thousands of speckle spots required by the market.

A transmitting device, a detection device and a terminal are applied to the technical field of detection, and the transmitting device comprises a first transmitting module and a second transmitting module. Wherein the first transmitting module is used for transmitting a first light beam, the polarization state of the first light beam is a mixed polarization state, and the mixed polarization state light beam is low in energy loss and high in energy density in the transmitting process and has good distance measuring capacity. The first transmitting module is used for transmitting the second light beam, the polarization state of the second light beam is linear polarization, the detection device is suitable for scenes needing higher transmissivity or higher reflectivity, and the anti-interference performance of the detection device can be improved. Furthermore, the first light beam and the second light beam are used for detecting different areas of the object space, composite detection combining mixed polarization detection and polarization detection is carried out on the object space, interference of reflection and the reflection effect on detection is reduced while the distance measuring performance of the detection device is not obviously reduced, and the detection device has higher detection precision.

The invention provides a non-reciprocal terahertz device. The non-reciprocal terahertz device comprises a first waveguide; the second waveguide is suitable for outputting the terahertz wave from the first waveguide; the at least three third waveguides are used for coupling the terahertz waves from the first waveguides to the second waveguides; the composite structure is positioned in each third waveguide and comprises a substrate; the first grating is suitable for converting the terahertz wave from the first waveguide from a linear polarization state to a circular polarization state rotating along a first direction; the magneto-optical material layer allows the circular polarization state terahertz waves rotating in the first direction to pass through under the action of an external magnetic field and blocks the circular polarization state terahertz waves rotating in the second direction to pass through; and the second grating is suitable for converting the terahertz wave passing through the magneto-optical material layer from a circular polarization state rotating along the first direction to a linear polarization state, transmitting the terahertz wave in the linear polarization state to the second waveguide, and converting the reflected terahertz wave from the linear polarization state to a circular polarization state rotating along the second direction.

The application relates to the technical field of road surface identification, and discloses an intelligent road surface identification system based on multi-modal sensor data fusion, which comprises a solving module, a region screening module, a data extraction module, a rotation inversion module, a depolarization module, a correction module and a road surface state judgment module. The orientation reference of sky polarization is obtained by solving the sun geometry, multi-spectral polarization images are fused to extract road surface features, the spectral polarization orientation split quantity is calculated, polarization parameter reverse rotation is carried out, the rotating linear polarization degree and the depolarization intensity are obtained, and the water body absorption optical thickness is determined. The system corrects the optical thickness by using an adaptive scale coefficient, and finally realizes intelligent identification of a dry state, a film state and a water film state of a road surface.

The invention discloses a polarization three-dimensional imaging method and system based on a Mueller matrix, and the method comprises the steps: building a polarization three-dimensional imaging model based on the Mueller matrix, and collecting a plurality of groups of polarization images through a dual-spin wave plate method; resolving a 4 * 4 Mueller matrix based on the multiple groups of polarization images; calculating a full stokes vector of the emergent light based on a 4 * 4 Mueller matrix; calculating the linear polarization degree according to the full stokes vector of the emergent light; a zenith angle is obtained in an iterative inversion mode based on the linear polarization degree; calculating an azimuth angle based on the Stokes parameter of the Stokes vector of the emergent light according to a polarization three-dimensional imaging model based on a Mueller matrix; constructing a target surface normal direction based on the zenith angle and the azimuth angle; and calculating a gradient field component according to the geometrical relationship between the target surface normal and the gradient, substituting the gradient field component into a frequency domain integral reconstruction formula, completing target surface height field reconstruction, and further obtaining a three-dimensional reconstruction image.

The application discloses a method for generating an ultralong focal depth array beam, and belongs to the technical field of grating manufacturing. The method comprises the following steps: constructing a Bessel beam excitation phase and a circular Airy beam excitation phase, constructing a composite phase distribution according to the array Bessel beam excitation phase and the array circular Airy beam excitation phase, and encoding the composite phase distribution to a metasurface; irradiating the metasurface with a linear polarization state plane wave, so that a left-handed circular polarization component excites an array Bessel beam, and a right-handed circular polarization component excites an array circular Airy beam; the array circular Airy beam is converted into a Bessel propagation mode after self-focusing, is spliced with the array Bessel beam in an axial direction to form a continuous light field distribution, and an ultralong focal depth array beam is obtained. The method can be applied to the fields of parallel laser processing, three-dimensional microscopic imaging and microparticle manipulation, and can extend the focal depth of the array Bessel beam while keeping the transverse resolution close to the diffraction limit.

The application discloses a linear polarization in-band scattering reconfigurable radiation time-sharing control array antenna and belongs to the technical field of antenna engineering, which comprises an antenna unit and a one-to-sixteen power divider, wherein the antenna unit is connected with the one-to-sixteen power divider; the antenna unit comprises a radiation patch one, a dielectric substrate one, a radiation patch two, a dielectric substrate two, a feed coupling branch, a feed metal column, a dielectric substrate three, a metal floor with holes and a dielectric substrate four; the bottom of the dielectric substrate four is provided with a PIN tube one, a PIN tube two, a feed transmission line, a DC biasing device, a reflective phase shifter and a low-pass filter; the DC biasing device is connected with the reflective phase shifter and the feed transmission line through the low-pass filter; and the feed metal column passes through the dielectric substrate three, the metal floor with holes, the dielectric substrate four in sequence and is connected with the feed transmission line. The application can not only guarantee the normal radiation efficiency of the antenna, but also effectively improve the reconfigurability of the antenna scattering.