771 results about "Linear polarization" patented technology

The invention relates to a method and a system for inhibiting strong mutual reflection based on polarization complementary logic coding. The method comprises the following steps: acquiring calibration parameters of a camera and a projector; generating a polarization phase shift stripe based on the calibration parameter, designing a high-frequency complementary logic code word, and embedding the high-frequency complementary logic code word into a polarization channel through polarization modulation to obtain a composite stripe pattern; the method comprises the following steps: calculating to obtain a linear polarization degree image through an acquired multi-angle polarization image, extracting a high-reflection region from the linear polarization degree image by adopting an adaptive threshold segmentation method, and carrying out binarization processing on the linear polarization degree image to obtain a binarized linear polarization degree mask; and on the basis of a decoding range of a binary linear polarization degree mask constraint high-reflection region, decoding the composite stripe pattern to obtain absolute phase level information, and performing noise suppression on the absolute phase level information by adopting a self-adaptive threshold algorithm. The method can effectively solve the influence of mutual reflection and high dynamic range of the surfaces of the measured object, and improves the precision and stability of three-dimensional reconstruction.

The invention relates to the technical field of image fusion, and discloses a sparse aperture optical system polarization image fusion method based on deep learning, and the method comprises the steps: obtaining a linear polarization degree image, a polarization angle image, and a polarization intensity image through a sparse aperture optical system, and constructing a polarization image fusion model comprising an encoder, a multi-mode fusion module, and a decoder; the encoder comprises two branches for respectively extracting three polarization image features, the multi-modal fusion module comprises an edge gradient compensation module for extracting multi-stage edge features, a polarization attention mechanism for adaptively weighting fusion features and a residual aggregation module for reserving original features, and the decoder uses multi-core deconvolution to decode aggregation features; and constructing a loss function and training a model in combination with the characteristics of the polarization images, and inputting the three polarization images to be fused into the trained model to obtain a polarization fusion image. According to the invention, effective fusion of polarization imaging and sparse aperture imaging can be realized, noise can be effectively suppressed, and the contrast and resolution of imaging can be improved.

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 linear polarization in-band scattering reconfigurable radiation time-sharing regulation array antenna, which belongs to the technical field of antenna engineering, and comprises an antenna unit and a one-to-sixteen power divider, the antenna unit is connected with the one-to-sixteen power divider, and the antenna unit is connected with the one-to-sixteen power divider. The antenna unit comprises a first radiation patch, a first dielectric substrate, a second radiation patch, a second dielectric substrate, a feed coupling branch knot, a feed metal column, a third dielectric substrate, a perforated metal floor and a fourth dielectric substrate, and a first PIN tube, a second PIN tube, a feed transmission line, a direct current bias device, a reflective phase shifter and a low-pass filter are arranged at the bottom of the fourth dielectric substrate; the direct-current bias device is connected with the reflection type phase shifter and the feed transmission line through the low-pass filter, and the feed metal column sequentially penetrates through the third dielectric substrate, the perforated metal floor and the fourth dielectric substrate and is connected with the feed transmission line. According to the invention, the normal radiation efficiency of the antenna can be ensured, and the reconfigurability of antenna scattering can be 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 surface defect detection device and method based on polarized optical dark field imaging, and belongs to the technical field of industrial defect imaging detection, the device comprises a polarization camera, an imaging lens, a polarization annular LED light source and a sample to be detected which are coaxially arranged; wherein the polarization camera and the imaging lens form a polarization imaging system, the polarization annular LED light source emits linearly polarized light with an inclination angle, and the linearly polarized light is reflected and scattered on a sample to be detected; the linearly polarized light enters the surface of a to-be-detected sample, a small amount of reflection and most of scattered light of the to-be-detected sample are collected by the imaging lens and the polarization camera through a circular hole in the center of the polarization annular LED light source, and finally imaging is achieved. The defect depth can be calculated according to the defect width and the defect inclination angle, so that the defect depth is inversed by the low-frequency linear polarization degree, and the problem that the defect depth information cannot be effectively extracted in the prior art is solved.

The invention discloses a spectral polarization imaging three-dimensional reconstruction method and device based on a pixel array, and a medium, and relates to the technical field of image processing, and the method mainly comprises the steps: collecting original images, which are fixedly obtained by pixels, of corresponding spectral bands and polarization angles; extracting sub-image information under each spectral band and polarization angle according to pixel positions, and stacking to generate a four-dimensional data volume; constructing a polarization geometric model according to the four-dimensional data body, and constructing an actual expression of the linear polarization degree in combination with a Fresnel reflection theory; constructing a redundant dispersion constraint equation and a theoretical expression of the relation between the diffuse reflection spectrum polarization degree and the incident angle and the imaging target refractive index; substituting the redundant dispersion constraint equation into a combined residual function of the theoretical expression and the actual expression, and performing parameter inversion on the combined residual function; and carrying out three-dimensional shape recovery under imaging target surface normal reconstruction based on an inversion result. According to the method, time delay and space registration errors caused by time-sharing acquisition are eliminated.

The invention discloses a polarization image generation method and device based on an RGB image and diffusion prior, and the method comprises the steps: obtaining and normalizing the pixel value of the RGB image, and obtaining an original image parameter; the original image parameters are input into a pre-trained polarization image generation model, diffusion prior information corresponding to the RGB image is output, and the diffusion prior information comprises a linear polarization angle and a linear polarization degree of coding; the pre-trained polarization image generation model is obtained by finely adjusting the pre-training weight of the large diffusion model; according to the coded linear polarization angle and the linear polarization degree, calculating light passing intensities of different preset polarization angles corresponding to the original image; and carrying out visualization processing on the light passing intensities of different preset polarization angles to obtain a plurality of polarization images. Therefore, by adopting the embodiment of the invention, diffusion prior information can be output through the model, and the information can generate a polarization image with a vivid effect and physical accuracy only through a single RGB image without depending on three-dimensional assets.

The invention discloses a polarization image fusion method and system based on multi-scale brightness perception. The method comprises the following steps: acquiring a linear polarization degree image and an intensity image based on a Stokes vector method; constructing a multi-scale brightness perception polarization image fusion network model based on a brightness dynamic weight generation mechanism and a bimodal feature interaction mechanism; and performing feature fusion processing on the linear polarization degree image and the intensity image based on the multi-scale brightness perception polarization image fusion network model to obtain a polarization fusion image. According to the method, the special target texture of the linear polarization degree can be accurately extracted under the condition of complex brightness, the details of the intensity image are kept, and the quality of the fused image is improved. The polarization image fusion method and system based on multi-scale brightness perception can be widely applied to the technical field of image fusion.

The invention discloses a nanosecond particle velocity measurement method based on orthogonal line polarization beam splitting, and belongs to the technical field of particle image velocity measurement. The method comprises the following steps: providing two linear polarization state orthogonal double-pulse lasers, and respectively outputting S polarization pulse light beams and P polarization pulse light beams; the four pulse light beams are combined through the double-path laser beam combining mirror set and output to the sheet light mirror set, and a plane illumination jet flow field with the thickness smaller than or equal to 1 mm is formed; scattered light is separated according to a polarization state by using a polarization beam-splitting cubic prism, and particle images under S polarization and P polarization are respectively captured by two double-exposure cameras which are orthogonally arranged; five kinds of time sequence control are triggered through a multi-channel synchronous controller; processing the view field deviation of the two cameras by adopting a block polynomial alignment method; and calculating a particle velocity field based on a particle tracking velocity measurement algorithm. According to the invention, the polarization debugging error is reduced, the homogeneity error after beam combination is obviously reduced, the coincidence degree of the four beams of planar light is improved, and a high-precision universal alignment scheme is provided for the multi-camera PTV technology.

The invention discloses an underwater image de-scattering method, system and device for scattering field decoupling in the technical field of underwater optical imaging and computer vision, and the method comprises the steps: calculating an intensity graph and a scene linear polarization degree graph according to an obtained multi-scale underwater image; according to the intensity image, performing image signal decomposition by using a dynamically constrained background light separation model to obtain a background scattering component and a target feature component; according to the scene linear polarization degree map and the background scattering component, calculating fusion transmissivity according to a non-linear optical transmission equation; carrying out noise suppression processing on the fusion transmissivity by adopting a double-constraint optimization architecture to obtain the fusion transmissivity subjected to noise suppression processing; and performing image reconstruction through a reverse optical propagation model according to the fusion transmissivity and the target feature component subjected to noise suppression processing to obtain a scattering-removed underwater image. The method effectively breaks through the dependence of a traditional method on the uniform hypothesis of a scattered field, and provides high-precision visual restoration support for an underwater detection task.

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 relates to a micro display device for a bifocal plane HUD (head up display) system, which solves the problems of halved field of view, limited working bandwidth, low color saturation and low brightness of the existing bifocal plane HUD system, and comprises an image display module and a polarization modulation element arranged above the image display module, the polarization modulation element is used for polarization modulation of display pixels, the effective area of the sub-wavelength medium grating arrangement is equivalent to a 1 / 2 wave plate, the display pixels are separated in a row-by-row or column-by-column staggered mode through the sub-wavelength medium grating arrangement, and the problem that the view field is halved due to an existing target surface space partitioning scheme is solved. The two adjacent sub-wavelength medium gratings convert incident light into linear polarization states in two directions, the two directions are mutually orthogonal, and the two spaced sub-wavelength medium gratings are completely the same, so that the two images are respectively adjusted into the mutually orthogonal linear polarization states, and the two images are generated in a staggered manner.

The invention relates to a sea small target identification method based on polarization three-dimensional reconstruction, a computer and a ship, and belongs to the field of sea surface small target detection.The sea small target identification method comprises the following steps that S1, light intensity images of a sea surface detection scene in the four polarization directions of 0 degree, 45 degrees, 90 degrees and 135 degrees are collected through polarization imaging equipment, and polarization images are obtained; s2, calculating to obtain a linear polarization degree and a linear polarization angle based on the polarization image; s3, deducing the surface normal direction of the sea surface detection scene by adopting a lookup table method based on the linear polarization angle; s4, deducing the three-dimensional depth of the sea surface detection scene by using a shape polarization SfP technology according to the surface normal direction; s5, according to the three-dimensional depth, gradient values of the sea surface detection scene in the horizontal direction and the vertical direction are obtained through calculation; and S6, according to the gradient value, setting a threshold value of the gradient to distinguish the small target and the sea surface background in the sea surface detection scene, and completing the detection of the sea surface small target. The method is high in detection speed and high in precision.

The invention provides a functional composite one-dimensional metal cavity slot array antenna, which belongs to the field of antennae, and comprises a feed cavity and a cover plate located at the top of the feed cavity, a plurality of groups of periodic intermediate-frequency anti-interference metal blocks and high-frequency anti-interference metal blocks are arranged in the feed cavity, and a radiation slot is formed in the cover plate. The polarization conversion structures are arranged on the two sides of the radiation slot in a stepped and open manner to form an undulating shape; an antenna array is also provided. An anti-interference periodic structure is embedded in the feed cavity, the antenna is endowed with anti-interference capacity in multiple different frequency bands, the polarization conversion structures are arranged on the two sides of the radiation slot in a stepped and open mode to form an undulating shape, an electromagnetic signal is input into the feed cavity, linearly polarized electromagnetic waves are radiated outwards through the radiation slot, and the antenna is formed. Linear polarization electromagnetic waves are decomposed into a group of orthogonal components with the same amplitude after passing through the polarization conversion structure, a 90-degree phase difference exists between the two components, circular polarization is formed to radiate towards the space, the polarization conversion structure is simple in structure and convenient to process, and the scattering characteristic of the antenna is improved.

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 utility model discloses an optical imaging system. The optical imaging system comprises a lens cone, an imaging group and a second spacing element, wherein the imaging group and the second spacing element are arranged in the lens cone. The imaging group sequentially comprises a linear polarization film, a reflective polarization element, a quarter-wave plate, a first lens, a second lens, a third lens, a fourth lens and a partial reflection layer from the first side to the second side along the optical axis; wherein the first lens and the second lens are glued, and the third lens and the fourth lens are glued. The second spacer element is disposed on the second side of the second lens and is in contact with the second side of the second lens. Wherein the outer diameter D0m of the second side end face of the lens barrel and the outer diameter D2m of the second side face of the second spacing element meet the condition that D0m-D2m is larger than or equal to 4.51 mm and smaller than or equal to 5.8 mm; the inner diameter d2m of the second side surface of the second spacing element, the inner diameter d2s of the first side surface of the second spacing element, and the axial distance T23 from the second side surface of the second lens to the first side surface of the third lens satisfy the following formula: (d2m-d2s) / T23 is greater than or equal to 0.97 and less than or equal to 2.79.

The present invention relates to the field of high-rate mobile wireless communications. Disclosed are a multi-frequency multi-polarized wide-beam scanning base station system, and an optimization design method. The method comprises: on the basis of an aperture field expansion theory and a mode coupling theory, designing a conical horn feed source antenna capable of radiating a Gaussian fundamental mode beam, and providing a stable beam width and a stable phase center; designing a beam separation device based on a periodic structure, wherein the beam separation device includes band-pass frequency selective surfaces and a linear polarization grid; and combining front-end quasi-optical links of multiple frequency channels and multiple polarized channels, so as to increase the bandwidth and communication rate of a base station antenna. In the present invention, a genetic optimization algorithm is combined with reflector shaping, thereby effectively reducing the conflict between a shielding effect of a dual-reflector antenna and a scanning angle, and realizing the multiplication of a beam scanning angle.

The invention discloses a cylindrical Luneberg lens antenna with azimuth plane and pitching plane scanning capability, which comprises a Luneberg lens, the Luneberg lens comprises a support plate and a plurality of dielectric plate units arranged on the support plate, the thickness of each dielectric plate unit is gradually changed, and the dielectric plate units are anisotropic; a first feed waveguide disposed on a side surface of the luneberg lens to perform linear polarization beam scanning; and the second feed waveguide is arranged at the bottom of the luneberg lens so as to carry out circular polarization beam scanning. According to the antenna, the scanning dimension of the cylindrical luneberg lens is expanded, beam scanning of an azimuth plane and a pitching plane is realized, and meanwhile, the advantages of simple feed and low cost of the antenna are reserved; and by using the anisotropic unit, the functions of the cylindrical luneberg lens and the polarizer are integrated into a single structure, so that the structural compactness is improved on the premise of not sacrificing the original beam scanning performance of the azimuth plane and the pitching plane. The invention relates to the technical field of antenna engineering.

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 antennas, in particular to a high-isolation double-frequency common-caliber miniaturized phased-array antenna which comprises a high-frequency-band linear polarization end-fire metal patch array structure, a low-frequency-band linear polarization end-fire metal patch array structure, a public metal reflection floor and a single-layer dielectric substrate. Radiation structures of the high-frequency-band linear polarization end-fire metal patch array structure and the low-frequency-band linear polarization end-fire metal patch array structure are formed by improved dipoles of microstrip balun feed with out-of-band rejection, so that linear polarization is achieved, and then the dipoles are fed through the improved microstrip balun with out-of-band radiation rejection. The suppression on high frequency is further deepened and the decoupling bandwidth is expanded; in addition, a decoupling structure is added between the adjacent common-frequency antennas to improve the isolation and radiation capability between the adjacent common-frequency antenna units, high isolation and wide beam coverage of the dual-frequency common-aperture phased-array antenna can be realized, the performance of the antenna is improved, and the dual-frequency common-aperture phased-array antenna is simple in process and low in cost.

The invention belongs to the technical field of image analysis, and particularly relates to an egg oiling quality detection method based on machine vision, so as to solve the technical problems of low contrast, high light interference and single information dimension of the traditional machine vision in the prior art, and the method comprises the following steps: S1, obtaining a multispectral polarization image of an egg to be detected; s2, obtaining a contour mask and a highlight area mask of the egg; s3, obtaining an effective analysis area; s4, generating a linear polarization degree characteristic pattern representing the uniformity of the oil film; s5, generating a spectral angle characteristic pattern representing the oiling thickness; s6, constructing a region graph which takes each superpixel as a node and the adjacency relation as an edge; s7, fusing the initial feature vectors of the superpixel nodes; s8, identifying and outputting the super-pixel nodes which are judged as oiling defects; and S9, comprehensively evaluating the oiling quality grade of the egg. And automatic and high-precision comprehensive grading of egg oiling quality is realized.

The invention belongs to the technical field of polarization imaging, and relates to a Sagnac broadband linear polarization imaging structure which comprises a second plane mirror, a first polarization beam splitter, a first polarization analyzer, a first imaging lens and a first focal plane array which are sequentially arranged on a first optical axis at intervals. The compensation plate is arranged close to the second plane mirror; the first plane mirror and the first polarization beam splitter are arranged on a second optical axis perpendicular to the first optical axis in a spaced mode and located on the side away from the compensation plate; the first blazed grating and the second blazed grating are reversely arranged at intervals and located on the light path between the first plane mirror and the second plane mirror, and the first blazed grating is close to the first plane mirror. The system provided by the invention is small in adjustment workload, high in accuracy, sufficient in shearing amount compensation, and good in broadband polarization imaging image precision and overall stability.

An antenna system for satellite applications is provide, the antenna system comprising an antenna array and a feed structure, and the antenna array is a passive antenna array configured to have a first state and a second state, the second state being a first deployed state. The feed structure is configured to provide a linearly polarized incident field for the antenna array in the first deployed state. The antenna array comprises a plurality of array elements, and the plurality of array elements forms a polarization conversion surface configured for converting the linearly polarized incident field to a reflected / transmitted circular polarized field. The antenna array is configured so that the radiation pattern of the reflected / transmitted circular polarized field corresponds to a predetermined radiation pattern and an array element geometry and an array element position of each of the plurality array elements are configured to provide the predetermined radiation pattern.

The invention relates to a linear structured light sensor polarization correction method and system based on reflected polarized light, and the method comprises the steps: obtaining the reflected light intensity of the surface of an object at different polarization angles, calculating a Stokes vector according to the reflected light intensity, building a mapping relation between the reflected light intensity and an incident angle based on the Fresnel law, and correcting the polarization of the linear structured light sensor. Obtaining a light intensity maximum value and a light intensity minimum value; calculating a linear polarization degree based on the maximum light intensity value and the minimum light intensity value, and obtaining an optimal laser incident angle based on the linear polarization degree and the refractive index of the object; constructing a polarization optimization model of a polarization angle and an incident angle by using a Stokes vector, and solving an optimal polarization angle; and acquiring a light stripe image of the polaroid at the optimal polarization angle, and performing polarization correction on the light stripe image based on a Stokes vector to realize three-dimensional measurement of an object. According to the invention, errors caused by factors such as light intensity, incident angle and image quality are effectively reduced, and the measurement precision is greatly improved.

A DFB linear polarization single-frequency fiber laser based on the polarization traction effect comprises a polarization-maintaining single-axis fiber isolator, the input end of the polarization-maintaining single-axis fiber isolator is connected with the signal end of a polarization-maintaining wavelength division multiplexer, and the pumping end of the polarization-maintaining wavelength division multiplexer is connected with the output end of a single-mode pumping light source. A common end of the polarization-maintaining wavelength division multiplexer is connected with one end of the polarization-maintaining fiber bragg grating, the other end of the polarization-maintaining fiber bragg grating is connected with an output end of the phase-shift fiber bragg grating through the PZT phase modulator, and the phase-shift fiber bragg grating is inscribed on a gain fiber to form a DFB fiber laser resonant cavity and fixedly packaged in an automatic temperature control heat sink. The DFB fiber laser resonant cavity is connected with the input end of the photoelectric detector, and the photoelectric detector converts an idle end laser signal of the DFB fiber laser resonant cavity into an electric signal. The linear polarization single-frequency laser source with excellent performance, high linear polarization degree and high stability can be provided for the fields of fiber-optic gyroscopes, nonlinear frequency conversion, coherent polarization beam combination and the like.

The invention discloses a dynamic linear polarization device design based on a phase-change diatomic metasurface, and relates to the technical field of phase-change metasurfaces, and the linear polarization device is a single-layer metasurface formed by a super unit composed of a dielectric material nano column 1 and a phase-change material nano column 2. Wherein the nanorod 1 is represented as a half-wave plate and is responsible for realizing the conversion of a polarization state, and the nanorod 2 can realize the change of a phase from 0 to pi by changing the state of a phase change material, so that the effect of maintaining the polarization is achieved. When light rays act on the two kinds of nano-columns at the same time, the nano-columns 2 allow transmission light to keep the original polarization state of incident light, and the nano-columns 1 change the polarization state of the transmission light. And the two kinds of transmission light are superposed subsequently, so that the transmission light output by the whole super-unit shows the linear polarization characteristic, and the polarization angle of the transmission light and the rotation angle of the nano-column are kept consistent or form an orthogonal relationship. According to the invention, a phase-change diatomic structure is adopted, so that the metasurface can realize a linear polarizer with an adjustable polarization angle under the incidence of any polarization angle.

The invention belongs to the technical field of liquid crystal alignment agents, and particularly relates to a liquid crystal alignment agent, a liquid crystal alignment film and a liquid crystal display element. The liquid crystal alignment agent comprises polyamic acid, a main chain of the liquid crystal alignment agent contains short side chain diamine and carbonate bonds, the short side chain diamine can slow down direct collision between film surfaces, carbonyl on a short side chain enhances absorption of ultraviolet light, and the compressive strength of a liquid crystal alignment film and the cracking alignment performance of the liquid crystal alignment film are improved; the carbonic ester bond can improve the voltage holding rate thermal stability of the liquid crystal alignment film and can improve the anchoring force of the liquid crystal alignment film and liquid crystals, the liquid crystal alignment agent with high compressive strength, voltage holding rate, high thermal stability and low linear polarization ultraviolet exposure is finally obtained, the stability of the high voltage holding rate improves the residual image of a display device, and the display effect is improved. And due to high compressive strength, the undesirable phenomenon of ZARA of the liquid crystal display device can be reduced.

The invention discloses an atom magnetometer device and method based on detection light frequency detuning amount modulation. Red and blue detuning linear polarization modulation light is used as detection light to realize modulation of an optical rotation angle of an atom magnetometer. Under the condition that the optical power of the modulated light is kept unchanged, the frequency of the modulated light is subjected to red detuning and blue detuning conversion with the same detuning amount relative to the resonance frequency of the alkali metal atom D1 line, so that the rotation angle is quickly switched between positive deflection and negative deflection, the modulation of the rotation angle is realized, and the modulation efficiency is improved. And the modulated optical rotation angle signal is subjected to polarization differential detection and phase-locked amplification technologies to obtain a magnetometer output signal containing to-be-detected magnetic field information. Compared with a conventional atom magnetometer modulation method, the method has the advantages that the modulation of the optical rotation angle is indirectly realized by carrying out red and blue detuning modulation on the detection light, the introduction of a modulation magnetic field is avoided, the optical power noise is suppressed, the low-frequency noise is isolated, and compared with an unmodulated mode, the amplitude of the optical rotation angle is enhanced, and the sensitivity of the magnetometer is improved.