86 results about "Single polarization" patented technology

The invention discloses a synthetic aperture radar (SAR) image ground object classification method based on comparative learning and a graph network. The method comprises the following steps: segmenting an SAR amplitude image into superpixels by using simple linear iterative clustering, and sampling to obtain feature pixel points; performing continuous two-dimensional sub-band decomposition on the feature pixel points in the SAR single-view complex data based on a time-frequency analysis theory of short-time Fourier transform to obtain a change image instant spectrogram of the backscattering intensity of the target under different azimuth angles and different electromagnetic wave frequency bands; utilizing a supervised contrast learning model to train an encoder network, and extracting potential features in the time-frequency spectrogram; segmenting the feature vector of the time-frequency spectrogram by using a graph convolutional neural network model; and finally, correcting a segmentation result by using spatial neighborhood features to obtain a final ground feature classification result. According to the method, under the condition that only scattering structure features in single-polarized SAR image data are used, the high-precision classification task of ground objects in the SAR image is achieved, and the requirement for an SAR sensor by using full-polarization data is avoided.

The invention discloses a river and lake dike long time sequence vertical settlement monitoring method comprising the following steps: carrying out data preprocessing on long time sequence satellite SAR data to obtain VV and VH data or HH and HV data in a dike protection range; extracting a water body, calculating the frequency of the target area monitored as the water body, and performing permanent surface water and other surface features distinguishing on the frequency by setting a specified distinguishing value to generate a land mask; classifying VV or HH single-polarized data of different data sources and satellite incidence angles, and then extracting the vertical settlement of a dike range mask area by adopting a time sequence InSAR method based on a high-resolution DEM and stable ground actual measurement points or PS points with small settlement; correlation analysis is carried out, vertical settlement data which meet correlation conditions and are obtained based on different data sources and satellite incidence angles are fused, and vertical settlement information of the dike is obtained. According to the invention, the vertical settlement data in the river and lake dike management range can be efficiently and accurately obtained.

The invention discloses a sandstone slice image component identification method based on a GL-SLIC algorithm and semi-supervised learning. The method comprises the following steps: firstly, acquiring a sandstone slice image amplified by 200 times under single polarization, converting an RGB image into a CIE-Lab color space, and extracting a GLBP texture feature vector; then a GL-SLIC superpixel segmentation algorithm is constructed, and adaptive segmentation based on texture and color features is realized in combination with a Gabor filter and a local binary pattern; then implementing a region merging algorithm to generate complete mineral particles and pore fragments; finally, a classifier based on VGG16 and a discriminator based on ResNet18 are constructed, a semi-supervised self-training framework is adopted, a model is initialized by using about 6% of manual labeling samples, a high-confidence-coefficient pseudo-label extension training data set is generated through iteration, and automatic recognition of sandstone components such as quartz, pores, kaolinite, rock debris and a matrix is achieved. According to the method, the recognition accuracy of 96.3% on a test set is achieved, compared with a traditional method, the segmentation precision and the recognition accuracy are remarkably improved, the data labeling cost is greatly reduced, and an efficient technical scheme is provided for automatic analysis of geological images.

The present application relates to the technical field of coast water edge line detection, and is an island water edge line detection method based on phase consistency random walk, comprising: converting a single polarization SAR image into a phase consistency image by using a two-dimensional logarithmic Gabor filter; obtaining a sea-land membership function by using an FCM method, and creating a global sea-land priori; constructing a cross-sea bridge marker field based on LSD, and creating a marker field priori of a non-water-permeable structure connected to an island; introducing a super-pixel layer to construct a water edge line detection model; inputting the single polarization SAR image into the water edge line detection model to obtain an output label of each pixel, and realizing island water edge line detection. The present application systematically solves the problems of coherent noise interference in the single polarization SAR image, difficulty in seed point initialization of the traditional random walk method, insufficient water edge line extraction precision caused by complex island contour, and invalidity of gray scale similarity in edge detection caused by large differences in ground object backscattering, and can effectively extract the island coast line of the single polarization SAR image.

The invention discloses a middle infrared band microstructure optical fiber polarization beam splitter, the polarization beam splitter comprises a centrosymmetric cladding and two fiber cores, the cladding and the fiber cores are composed of a substrate material GaS and air holes, and the cladding is located on the outer side of the fiber cores. The cladding is composed of first air circular holes and second air circular holes, and the plurality of first air circular holes are periodically arranged in a triangular lattice structure. The fiber core is composed of a first elliptical air hole, a second elliptical air hole, a third air round hole and a fourth air round hole, and the fiber core is located between the first elliptical air hole and the second elliptical air hole and is a solid core filled with a GaS substrate material. The length of the micro-structure optical fiber polarization beam splitter of the middle-infrared band is only 40 microns, and the extinction ratio at the wavelength of 4.42 microns can reach-70 dB; and single polarization output can be realized in a range of 4.29 [mu] m to 4.59 [mu] m. The device has the advantages of small size, high extinction ratio, large bandwidth and the like, adopts a single material, effectively reduces the manufacturing difficulty of the device, is easy to integrate and miniaturize, and has potential application value in the fields of mid-infrared optical fiber sensing, mid-infrared band communication, mid-infrared band environment detection, optical nonlinearity and the like.

An antenna, an antenna device and a communication base station belong to the technical field of antennas and aim to reduce coupling among multi-band signals, the antenna is configured to radiate a signal of a first band and comprises at least one single-polarized radiator, and the single-polarized radiator comprises a radiation structure and a plurality of radiation structures, comprising a first dielectric substrate and a radiation arm located on one side of the first dielectric substrate, the radiation arm comprises a plurality of radiation branches, and the plurality of radiation branches are sequentially connected to form a ring; the feed structure is connected with the radiation structure and is configured to feed an electric signal into the radiation structure; and the filtering structure is at least loaded between the radiation branches and is configured to weaken the influence of the antenna on a signal of a second frequency band, and no overlapped frequency band exists between the second frequency band and the first frequency band.

The application provides a long-wave band PolInSAR under-forest terrain inversion method and equipment based on non-penetration depth correction, acquires two scenes of full polarization SAR image data and pre-processes, generates a polarization interference covariance matrix; carries out white processing on the polarization interference covariance matrix, applies a normal matrix constraint, acquires an optimal normal matrix approximate solution, extracts two end point complex coherence coefficients of a coherent line segment; based on a polarization coherence scattering model, solves model parameters by using the end point complex coherence coefficients, including a ground surface phase, a forest height, an extinction coefficient and a ground body amplitude ratio; combines sparse LiDAR height data, calculates the non-penetration depth between the forest height and the RVoG inversion terrain and the LiDAR reference terrain, constructs a one-dimensional look-up table based on the mapping relationship between the forest height and the non-penetration depth; and corrects the under-forest terrain height deviation of the PolInSAR inversion according to the one-dimensional look-up table. The application can significantly improve the precision of the ground surface terrain inversion in the forest area, and can realize large-scale under-forest terrain mapping by only relying on a single polarization interference.

Apparatuses and methods for a dual-pol antenna for increasing panel gain from limited aperture area for massive MIMO base station in a wireless communication system. A method of a base station (BS) in a wireless communication system includes transmitting polarized electro-magnetic (EM) waves in a direction of a Z-axis via an antenna panel comprising at least one dual polarized antenna and at least one three-dimensional (3D) end-fire antenna, wherein: the at least one dual polarized antenna includes a set of dual polarized antenna elements, at least one individual single polarized antenna element being configured based on a staggered configuration to form the set of dual polarized antenna elements; and the at least one 3D end-fire antenna is configured based on the set of dual polarized antenna elements, the 3D end-fire antenna being oriented in a direction of the Z-axis.

The application discloses a compact dual-polarized end-fire dielectric resonator antenna for a millimeter wave terminal, and particularly relates to the technical field of millimeter wave communication, and solves the technical problem that although in the millimeter wave frequency band, a dielectric resonator antenna has the advantages of small volume, high design freedom and low loss; however, the current millimeter wave end-fire dielectric resonator antenna is limited to single-polarized radiation; and the dielectric resonator antenna cannot be fully utilized while high integration is achieved; the technical scheme is that two orthogonal dielectric resonator modes of vertical polarization and horizontal polarization are adopted to work, and two polarizations share the same structure; the application can realize dual-polarized coverage, end-fire beam scanning in the millimeter wave frequency band, and has the excellent characteristics of low profile and small planar size.

The application discloses a multi-light-path projection device, a three-dimensional measurement system and a method, and relates to the field of three-dimensional measurement technology.The multi-light-path projection device comprises a uniform light source module, which is used for emitting a collimated light source with uniform light field distribution containing multiple colors; a light source modulation module, which is used for modulating the light source emitted by the uniform light source module, so that the light source contains a set projection pattern and the light source is decomposed into two beams of polarized light with different phases, and the two beams of polarized light are subjected to time sequence control; and a projection module, which comprises a plurality of pairs of projection outlets, each of which is used for projecting a light source with a single polarization state, the light sources projected by each pair of projection outlets are of the same color and different polarization states; and the positions of all the projection outlets are matched with each other, so that the areas projected by all the projection outlets are coincident.The light path structure of the projector is matched with the time sequence control of the light source and the reflective microcrystal projection chip, so that high-overlapping, multi-directional projection and real-time output of three-dimensional point cloud information and two-dimensional color images can be realized.

The application discloses a small-sized broadband dual-frequency dual-polarized nested co-caliber antenna unit and belongs to the technical field of electromagnetic field antenna design. The antenna comprises an L-wave dual-polarized antenna module and an S-wave dual-polarized antenna module; four S-wave dual-polarized antenna modules are evenly distributed around the L-wave dual-polarized antenna module as parasitic units; the L-wave dual-polarized antenna module is located at the center of the antenna unit and comprises two cross-orthogonal single-polarized microstrip dipole antennas; the cross-arrangement mode divides the antenna unit into four areas; and the four S-wave dual-polarized antenna modules are evenly distributed at the central positions of the four areas as parasitic units. The application effectively realizes the axial symmetry of the L-wave and S-wave dual-polarized radiation unit patterns and the consistency of the phase centers, guarantees the high isolation of the dual-frequency dual-polarization, and provides a basis for the lightweight and integrated design of the large-caliber dual-frequency dual-polarized antenna.

The application provides a small-size ultra-wideband wall-hanging antenna with high stability, and specifically relates to a single-polarization directional wall-hanging antenna, which is vertically polarized and comprises a first radiating vibrator, a second radiating vibrator, a first coupling sheet, a second coupling sheet, a third coupling sheet, an antenna cover, a cable feeder and a reflecting plate. The first radiating vibrator and the second radiating vibrator form an asymmetric antenna dipole radiator, and the first coupling sheet and the leftmost part of the second radiating vibrator form an asymmetric structure. The second coupling sheet and the third coupling sheet are separately arranged on the left and right sides of the included angle formed by the first radiating vibrator and the second radiating vibrator. The technical scheme improves the feeding mode and feeding process of the existing wall-hanging antenna on the market, greatly reduces the production cost of the antenna, has the characteristics of low intermodulation, ultra-wideband, simple structure, low cost, stable electrical performance and the like, and can be perfectly applied to a mobile communication system with directional coverage requirements.

This invention provides a dual-polarized butterfly slot antenna, comprising a radiating component, a reflecting component, and a cavity component. The dual-polarized butterfly slot antenna has mutually perpendicular length, width, and height directions. The radiating component and the reflecting component are arranged parallel to each other along the height direction. Projections along the height direction onto the same plane perpendicular to the height direction are made, with the projection of the radiating component located within the projection of the reflecting component. A cavity component is fixedly connected to each end of the reflecting component along the width direction, and each cavity component extends along the height direction towards the radiating component. The side of each cavity component away from the reflecting component is engaged with the radiating component. The radiating component includes two single-polarized units, each with a butterfly slot. The technical solution provided by this invention can solve the problems of complex structure, difficulty in assembly and production, and low radiation gain in existing dual-polarized antennas.

The application discloses a dual-polarization weather radar speed ambiguity resolution method based on lag-1 cross-correlation, which utilizes lag-1 cross-correlation of adjacent radial directions instead of radial velocity of the adjacent radial directions in a traditional algorithm to calculate an ambiguity resolution reference speed. This makes the ambiguity resolution speed range of the ATAR mode expand to twice that of the traditional algorithm, so that the speed measurement range is consistent with that of the single-polarization mode. Application of the algorithm improves the reliability of speed data of the ATAT mode weather radar in severe weather detection.

An ultra-wideband phased array antenna element includes a single-polarized antenna element, two single-polarized antenna elements are cross-placed to form a dual-polarized tightly coupled phased array antenna element, the dual-polarized tightly coupled phased array antenna element is placed on an X-shaped groove in the middle of a metal structure, the metal structure serves as the ground plane of the dual-polarized tightly coupled phased array antenna element, and a compatible third dielectric substrate is covered on the metal structure. The surface of the third dielectric substrate is embedded with a first resistive frequency selective surface and a second resistive frequency selective surface, the second resistive frequency selective surface is covered with a copper layer, and finally, a PP sheet is used to bond the third dielectric substrate and a fourth dielectric substrate. The introduction of the resistive frequency selective surface in this invention greatly widens the antenna operating bandwidth, and the director can improve the antenna ground radiation efficiency. This antenna element has a 9-fold ultra-wideband operating bandwidth for practical engineering applications, a large scanning range of 45° between the E-plane and H-plane, excellent port isolation, relatively low cross-polarization, and high radiation efficiency.

The present application belongs to the technical field of synthetic aperture radar interferometry, and provides a kind of spaceborne multi-baseline InSAR data vegetation height retrieval method, comprising: obtaining spaceborne multi-baseline InSAR data and external DEM data, and carrying out main auxiliary image registration operation to multi-baseline InSAR data;Based on spaceborne multi-baseline InSAR data, obtain the vertical wave number of the multiple interference baselines formed by main satellite and auxiliary satellite and interference complex coherence;Multi-baseline is respectively constructed RVoG model, and vertical wave number and interference complex coherence are substituted into the RVoG model of multi-baseline, and three-dimensional look-up table is formed respectively;The intersection of three-dimensional look-up table is obtained, and the unknown parameter at intersection is the vegetation scene parameter obtained by inversion.The present application utilizes the multiple independent single polarization interference data that can be provided by spaceborne multi-baseline InSAR satellite system, and through constructing three-dimensional look-up table between extinction coefficient, vegetation height and ground scattering ratio and interference complex coherence, the effective inversion of vegetation height is realized.

The application provides a BB84 polarization encoding integrated photon chip and an encoding method, which can be applied to the technical field of quantum communication and integrated photonics. The chip sequentially integrates a decoy state generation unit, a polarization encoding unit and an optical switch unit through optical paths on a single integrated photon chip, aiming to solve the problems of large volume, poor stability and slow switching speed existing in traditional discrete optical encoding schemes. The polarization encoding unit adopts a discretization generation mechanism based on multiple parallel fixed optical paths to synchronously generate four polarization quantum states required by the BB84 protocol; the optical switch unit high-speed gates the fixed optical paths to realize random output of a single polarization quantum state. The application realizes full-function monolithic integration of decoy state generation and polarization encoding, and has the beneficial effects of compact structure, stable output, high speed, low loss and strong anti-interference ability.

The invention relates to the technical field of copper pipe defect detection, in particular to a non-contact copper pipe surface sawtooth damage detection method and system, and the method comprises the steps: providing an illumination light beam which continuously and periodically changes in a linear polarization direction for the surface of a copper pipe on a copper pipe advancing path; in a single polarization rotation period, surface reflection images under illumination of the illumination light beams are collected multiple times at a fixed time interval, and a polarization time sequence image group is generated; performing spatial alignment on the polarization time sequence image group, and obtaining a direction characteristic value of an edge point of the same physical position in each image; based on the change sequence of the direction characteristic value along with the polarization rotation angle, calculating a quantitative index representing the direction change out-of-synchronization degree to generate a disorder degree index; the disorder degree index is compared with a preset judgment threshold value, and when the disorder degree index is larger than the preset judgment threshold value, it is judged that jagged injuries exist. According to the invention, the core problem of insufficient discrimination between zigzag geometric damage and normal edge texture in non-contact detection is effectively solved.

The application discloses a 5G-A base station antenna integrating communication and sensing, which comprises a reflecting plate, a communication module, a sensing module, a feed network assembly, a phase shifter assembly and a radome. The communication module is arranged on the reflecting plate and comprises a plurality of dual-polarized dipoles for transmitting beams. The sensing module is arranged on the reflecting plate and comprises a plurality of single-polarized dipoles for receiving reflected beams reflected by sensing objects. The feed network assembly is arranged on the reflecting plate and connected with the communication module and the sensing module. The phase shifter assembly is connected between the feed network assembly and the communication module and the sensing module. The radome is arranged on the communication module, the sensing module, the feed network assembly and the phase shifter assembly and connected with the reflecting plate. The above structure is suitable for a 5.5G communication system, realizes integrated design of communication and sensing, and makes up for the deficiency of a single communication mode of a traditional base station antenna.

The invention provides an ultrahigh-frequency film bulk acoustic wave device and a preparation method thereof, and the ultrahigh-frequency film bulk acoustic wave device achieves high-order mode excitation through a piezoelectric layer in a single polarization direction and a reverse electric field of an adjacent layer. According to the preparation of the ultrahigh-frequency film bulk acoustic wave device, only piezoelectric layers with identical polarization directions need to be prepared, a differential preparation process of piezoelectric films with multiple polarization directions does not need to be researched, developed and controlled, the complexity of the process steps is reduced, and the whole preparation process is based on mature semiconductor processes such as etching, deposition and sacrificial layer release. No special equipment or customization technology needs to be introduced, the threshold of technology research and development and production implementation is greatly reduced, through technology simplification, the manufacturing cost is reduced, and large-scale mass production can be achieved.

The invention discloses a tropical rainfall identification method based on S and C wave band weather radars, and belongs to the technical field of tropical rainfall identification, and the method comprises the steps: forming a rainfall vertical reflectivity profile based on radar reflectivity data obtained by S and C wave band single polarization radars; acquiring 0 DEG C layer height data, and determining the initial height of tropical rainfall identification in combination with the rainfall vertical reflectivity profile; searching a local radar reflectivity maximum value Zmax in the rainfall vertical reflectivity profile from the initial height downwards; according to the method, a rainfall reflectivity vertical profile is taken as a core identification basis, a starting height is determined by combining 0 DEG C layer height data, a local reflectivity maximum value Zmax is searched through layer-by-layer traversal, and multi-dimensional judgment conditions such as melting layer bright band judgment and a difference threshold value of Zmax and Zmin are introduced, so that the accuracy of the rainfall reflectivity is improved. The method can accurately identify the core characteristic of tropical rainfall that the low-layer reflectivity is enhanced along with the reduction of the altitude, prevents the common convective or stratified cloud rainfall from being misjudged as tropical rainfall, and effectively improves the identification precision.

The application discloses a single polarization mode interferometric synthetic aperture radar tree height phase decoupling method and system, first, interferometric SAR data is acquired; then, a plane equation is used to construct a terrain height model, and a probability density function of the interferometric phase is constructed to be converted into tree height data and terrain height data; by constructing an estimation function, difference between adjacent pixels is carried out, constant term separation in the terrain height model is realized, and phase gradient information is acquired; adjacent pixel tree height gradients are obtained by searching the estimated tree height gradients; finally, a sparse matrix is constructed, adjacent tree height gradients are integrated to determine absolute tree height, real tree height is obtained by integration, and forest tree height is output. The method provided by the application introduces the phase gradient theory into the tree height inversion field, so that the method can not only break through the limitation of the number of polarization channels, but also does not need to use external reference DEM prior information, and realizes tree height phase decoupling and inversion based on single polarization InSAR data.

The invention belongs to the technical field of ground penetrating radars, and particularly relates to a dual-polarization three-dimensional Gray code GPR acquisition system, which solves the technical problem that target information contained in echoes is limited when detection is performed in a single polarization mode, and comprises an FPGA (Field Programmable Gate Array) transmitting unit, a dual-polarization antenna array and an FPGA receiving unit, the FPGA transmitting unit comprises a transmitting end FPGA logic controller, a power amplifier, a power divider and a controllable delay circuit; the dual-polarized antenna array comprises at least two transmitting antennas in the orthogonal direction and two receiving antennas, a VV polarization channel and an HH polarization channel are formed, and co-polarized data acquisition is achieved through switching control. The FPGA receiving unit comprises N + 1 paths of front-end signal conditioning circuits, N + 1 paths of high-speed ADC acquisition circuits, a clock synchronization controller, a receiving end FPGA logic controller, a DDR3 data caching unit, a PCIe data uploading unit and an upper computer. According to the acquisition system, detection requirements of different precisions can be met at the same time, the profile data consistency is good, and the imaging and detection effects can be fully ensured.

The present invention relates to a broadband quadrature mode converter with linear polarization obtained by additive manufacturing, the quadrature mode converter comprising a hybrid coupler comprising: a first waveguide comprising a first input port and a first single polarized output port; and a second waveguide including a second input port and a second single-polarized output port; and a coupling portion connecting the first waveguide to the second waveguide, the orthogonal mode converter further comprising a spacer polarizer comprising: a third single-polarized input port connected to the first output port; and a fourth single polarization input port, wherein the fourth single polarization input port is connected to the second output port; and a third single-polarized output port, in which the first waveguide and the second waveguide are arranged symmetrically with respect to a plane of symmetry of the septum including the septum polarizer.

The application discloses a kind of laser scanning detection method and system of glass surface defect, belong to optical intelligent detection technical field.This method establishes multi-angle laser scanning optical path, makes incident angle in 15° to 75° range continuously adjustable, and drives light beam to carry out two-dimensional scanning;Polarization light path system is configured, incident laser is converted into single polarization state linearly polarized light, and reflected light is divided into two ways by beam splitter at detection end, respectively for monitoring total light intensity and measuring light intensity after polarization analysis, and performing polarization state orthogonal alignment process, so that the transmission axis of polarization analysis element and the polarization direction of mirror reflection component are orthogonal;Double-mode scanning detection is executed, low-angle incidence mode is used to quickly establish overall topography profile, and high-angle incidence mode is used for fine detection of specific area.The application can effectively suppress the mirror reflection interference of high-reflectivity glass surface, avoid signal saturation, and realize high-precision and high-efficiency glass surface flatness detection.

This application proposes a Littman external cavity tunable laser, relating to the field of laser technology, comprising: a semiconductor optoelectronic device for outputting a broadband optical signal; a focusing module for collimating and focusing the broadband optical signal, projecting the focused light onto a mode-spot conversion polarization rotating beam splitter; a mode-spot conversion polarization rotating beam splitter for adapting the mode size and controlling the polarization state of the focused light, filtering out non-target polarization components, outputting a target polarized optical signal with a single polarization state, and also for adapting the mode size of the reflected external cavity feedback light; and a tuning output module for spatial dispersion separation of different wavelength components, generating zero-order diffracted light as the laser output light, and generating first-order diffracted light as the external cavity feedback light, and achieving laser wavelength tuning by changing the wavelength of the external cavity feedback light. This application can solve the defect of unstable polarization state during the tuning process of traditional Littman lasers.

The invention discloses a polarization sensitive optical coherence tomography method and system based on single-state input. According to the method, polarized light in a single polarization state is injected into a sample, and fixed time delay is introduced into interference data of an orthogonal polarization channel, so that gradient phase difference linearly changing along with imaging depth is generated, and virtual modulation of the polarization state is realized. A polarization state matrix after phase compensation is constructed based on the gradient phase difference, and sample type discrimination and real local optical axis direction determination are synchronously completed by calculating a tangent vector, a normal vector and an auxiliary normal vector of the polarization state matrix according to the relation between the auxiliary normal vector and a Stokes space preset axis. The system can be adapted to an endoscopic OCT structure for rotary retracement scanning and a galvanometer OCT structure for reflection deflection scanning. According to the invention, while the advantages of simple structure and low cost of a single-state input system are maintained, the problems of failure in a weak birefringence region and deep tissue measurement distortion in a traditional method are effectively overcome, and the precision and reliability of local polarization measurement are remarkably improved.

The present disclosure provides a polarization-insensitive array waveguide grating applied to the field of optical communication wavelength division multiplexing technology, comprising: an input channel waveguide, which inputs multi-wavelength mixed polarization state composite light into an input slab waveguide area; the input slab waveguide area diffracts the multi-wavelength mixed polarization state composite light; a first array waveguide module, which performs power distribution on the diffracted light from the input slab waveguide area to form a plurality of first composite lights, and transmits the first composite lights to corresponding polarization beam splitters respectively; a polarization beam splitter module, which separates each first composite light into a plurality of multi-wavelength second composite lights with single polarization; a second array waveguide module, which transmits the plurality of second composite lights to an output slab waveguide area respectively; the output slab waveguide area diffracts the plurality of second composite lights and focuses the diffracted light of different wavelengths to different output channel waveguides; and the output channel waveguide, which outputs light of different polarization states at the same specific wavelength.

The invention relates to the technical field of optical microscopic detection, in particular to a single-frame phase contrast microscopic imaging method based on multi-polarization-direction light field reconstruction, which comprises the following steps: adding polarization masks in a plurality of polarization directions into a microscopic light path; irradiating the sample to obtain a polarization image with multiple pieces of polarization direction information; carrying out polarization channel separation on the obtained polarization image to obtain sample intensity images corresponding to a plurality of polarization directions; generating image spectrum distribution corresponding to the polarization direction according to the sample intensity image; and performing phase recovery on the obtained image spectrum distribution to obtain a phase contrast microscopic image of the sample. According to the invention, multi-polarization light field information of a sample can be collected into a single polarization image, and a phase contrast microscopic image is obtained through a reconstruction algorithm. According to the polarized light field acquisition scheme, high-contrast and high-stability real-time phase measurement can be realized only by a single polarized image.