79 results about "Polarization sensitive" patented technology

The invention belongs to the technical field of radar signal processing, and discloses a radar scattering rapid test method based on polarization decomposition. Comprising the following steps: scanning a target 3D model, simulating scattered field distribution in different incident angles and polarization modes, calculating polarization contrast, and identifying a polarization sensitive area; establishing a dynamic coordinate system conversion model, fusing RTK data, IMU data and laser tracking data, and correcting the position of the trolley and the model in combination with a Doppler frequency shift model and a least square method; calculating an optimal test path of the trolley according to the sensitive area by adopting a natural heuristic optimization algorithm; establishing a geometric environment model, obtaining a back scattering signal through beam forming, analyzing a polarization coherence matrix, obtaining a high-entropy region, and decomposing scattering components; according to the method, closed-loop optimization is formed from a data acquisition source to a scattering component analysis tail end, and the test efficiency and the real-time performance are remarkably improved.

The invention relates to the field of array signal processing, and particularly discloses a DOA joint estimation method based on a quaternion polarization sensitive array. Electromagnetic wave dual polarization components are captured through the orthogonal dipole and the loop antenna, and a quaternion observation matrix is constructed; calculating a quaternion covariance matrix by adopting a sliding window mechanism, and separating a signal / noise subspace by adopting quaternion singular value decomposition; and constructing a spatial spectrum function in combination with a quaternion steering vector, and realizing joint estimation of an azimuth angle and a pitch angle through two-dimensional search. According to the method, the unified characterization capability of quaternions on polarization-airspace information is fully utilized, and the DOA estimation precision and the anti-interference performance of the multi-polarization signal are remarkably improved.

The invention discloses a polarization sensitive type broadband absorber based on metal-medium stacking, and relates to the technical field of micro-nano photonic devices and infrared detection. The absorber sequentially comprises a bottom-layer high-loss metal reflecting layer, a multi-layer stacked composite dielectric cavity structure and a top-layer sub-wavelength metal grating from bottom to top, according to impedance matching and interference resonance theories, a broadband absorption substrate is constructed through a multi-layer film structure at the bottom, and light energy is converted into heat energy by utilizing the high loss characteristic of bottom layer metal; plasmon resonance is excited through the top metal grating, the coupling efficiency of TM polarized light is enhanced, and TE polarized light is cut off; the above structural design successfully realizes efficient broadband absorption and high polarization extinction ratio in an infrared band. The structure is simple in design, is compatible with a CMOS technology, and has excellent wide-angle stability. And meanwhile, polarization screening can be realized without an external polaroid, and miniaturization and integration of an infrared detection system are facilitated.

The invention belongs to the technical field of electronic components, and relates to a photoelectric transistor, in particular to a polarization sensitive photoelectric transistor with a MoS2 / In2Se3 heterojunction as a conducting layer. The MoS2 / In2Se3 heterojunction phototransistor comprises a Si / SiO2 substrate, a semiconductor MoS2 nanosheet, a semiconductor In2Se3 nanosheet, a source electrode and a drain electrode, the MoS2 nanosheet and the In2Se3 nanosheet form a vertical heterojunction located on the substrate, and the source electrode and the drain electrode are located at the two ends of the MoS2 / In2Se3 heterojunction. According to the invention, the MoS2 / In2Se3 heterojunction structure with intrinsic anisotropy is adopted to carry out polarized photoelectric detection, complicated optical components such as an additional optical polarizer and an optical filter are not needed, and the problems that a traditional polarized photoelectric detector is complicated in structure and cannot be integrated are solved; the two-dimensional material heterojunction with excellent photoelectric property is used as the conductive layer, so that the power consumption of the phototransistor is effectively reduced.

The invention discloses a polarization-sensitive narrow-band solar blind self-driven photoelectric detector and a preparation method thereof, and belongs to the technical field of semiconductor photoelectric devices. The detector comprises an n-type conductive single Ga2O3 micron wire, a p-type conductive GaN substrate, a PET substrate and a two-dimensional graphene film. According to the device, Ni / Au alloy is selected as a positive electrode, and a two-dimensional graphene film is used as a transparent window of ultraviolet solar blind light and a negative electrode of the device. By means of built-in potential formed by the n-Ga2O3 / p-GaN heterojunction and a Schottky barrier of Ga2O3 / Graphene, high-sensitivity detection of solar-blind ultraviolet light under the self-driving condition is achieved. The device has relatively high responsivity, specific detection rate and external quantum efficiency. The preparation method comprises the following steps: cleaning the GaN substrate, evaporating the Ni / Au electrode, adhering the PET substrate with the channel, transferring the Ga2O3 micron wire to form the heterojunction, and transferring and curing the graphene electrode. The device has the characteristics of polarization sensitivity and low power consumption, and can be applied to the fields of ultraviolet solar blind band encryption communication and environment monitoring.

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 application provides an orbital angular momentum and wavelength dual multiplexing polarization sensitive zooming super lens based on an orbital angular momentum and wavelength dual multiplexing polarization sensitive zooming super lens, characterized in that the super lens is composed of a silicon dioxide substrate layer and a silicon elliptical nanometer column medium layer. Through an orbital angular momentum topological charge number orthogonality and wavelength selectivity dual multiplexing mechanism, combined with a polarization sensitive design, a geometric phase regulation mechanism, the silicon elliptical nanometer column array is optimized through size and rotation angle, 0-2pi full phase coverage is realized, different orbital angular momentum modes, different wavelengths and left-handed / right-handed circularly polarized incident light are precisely demultiplexed in a 400-700nm visible light band, multi-channel independent zooming can be realized, and the focusing efficiency is greater than or equal to 65%. The application solves the defects of single zooming function, limited channel capacity and poor polarization compatibility of the traditional super lens, has compact structure and high integration, and can be widely applied to the fields of miniature imaging systems, optical communication, holographic display and the like.

The present invention belongs to the field of radar signal processing technology and discloses a rapid radar scattering test method based on polarization decomposition. The method comprises the following steps: scanning a 3D target model, simulating scattering field distributions under different incident angles and polarization modes, calculating polarization contrast, and identifying polarization-sensitive areas; establishing a dynamic coordinate system conversion model, fusing RTK data, IMU data, and laser tracking data, and correcting the vehicle position and model by combining a Doppler frequency shift model and a least squares method; using a nature-inspired optimization algorithm to calculate the vehicle's optimal test path based on sensitive areas; establishing a geometric environment model, obtaining backscattered signals through beamforming, analyzing a polarization coherence matrix, obtaining high-entropy areas, and decomposing scattering components. The method forms a closed-loop optimization from the data acquisition source to the scattering component analysis end, significantly improving test efficiency and real-time performance.

A system for visualizing a target site in an eye using a polarization sensitive optical coherence tomography (PS-OCT) device includes a controller having at least one processor and at least one non-transitory tangible memory on which instructions are recorded. The target site is one or more vitreous opacity in vitreous fluid of the eye. The controller is configured to receive the PS-OCT data and determine, based on the PS-OCT data, at least one parameter corresponding to a birefringence characteristic of collagen fibrils in the vitreous humor. The at least one parameter includes a respective pitch of collagen fibrils. The controller is configured to determine a respective location of the one or more vitreous opacity when the at least one parameter exceeds a predefined range, and to generate a control signal adapted to direct the treatment beam at the respective location of the one or more vitreous opacity.

An optical construction includes an optical film between first and second prismatic films, which each include pluralities of parallel, linear first and second prisms. Each of the first and second prisms have opposing first and second sides extending from first and second ends of a base of the prism and meeting at a peak. The first and second sides make first and second base angles with the base of the prism. The peaks of the prismatic films face away from each other and the optical film. For a collimated, normally incident light, for at least a first wavelength in a first wavelength range, and for each of first and second polarization states: the optical film has an optical transmission of less than about 1%, and the optical construction transmits at least 1% of the incident light at an oblique angle greater than 5 degrees with respect to the optical film.

A fiber scanning projector includes a piezoelectric element and a scanning fiber passing through and mechanically coupled to the piezoelectric element. The scanning fiber emits light propagating along an optical path. The fiber scanning projector also includes a first polarization sensitive reflector disposed along and perpendicular to the optical path. The first polarization sensitive reflector includes an aperture and the scanning fiber passes through the aperture. The fiber scanning projector also includes a second polarization sensitive reflector disposed along and perpendicular to the optical path.

The application discloses a polarization-sensitive wide-angle matching structure and an ultra-wideband wide-scan-angle low-standing-wave tight-coupling antenna. The polarization-sensitive wide-angle matching structure comprises a first polarization-sensitive structure medium substrate, a first polarization-sensitive structure, a second polarization-sensitive structure medium substrate, a second polarization-sensitive structure, a third polarization-sensitive structure, an isolation layer and a wide-angle matching layer. The application adopts three layers of wide-angle matching structures with different shapes along the E plane and the H plane of the antenna, can improve the impedance matching conditions in two scanning directions according to different impedance change rules when the tight-coupling array is scanned along the E plane and the H plane, and realizes a lower active standing wave under a large scanning angle.

The invention discloses a dual-polarization microwave energy efficient receiving composite metasurface array and a receiving method, and the method comprises the steps: enabling different polarization plane waves to irradiate a polarization selective waveform conversion function region composed of biaxial symmetric split-ring resonators, and carrying out the unit differential response and reflection phase gradient arrangement, converting the x-polarized plane wave and the y-polarized plane wave into surface waves propagating in the-x direction and the y direction respectively; the square ring-shaped artificial surface plasmon polariton structure is used for receiving the surface wave, and the surface wave is stably guided to the waveform focusing and energy extraction functional area through momentum matching; by means of gradient refractive index distribution focusing surface waves of a planar semi-Maxwell fisheye lens, an equiphase surface is bent into a spherical surface shape, and energy is converged to a focus; energy is led out through the microstrip line structure at the focus, efficient transmission is achieved through impedance matching, and collection and conversion of different polarization microwave energy are completed. The polarization sensitivity problem of a traditional scheme is solved, and the microwave energy collection efficiency is improved.

This invention relates to a method for measuring the depolarization of a medium in intravascular polarization-sensitive optical coherence tomography (ICP-CT), comprising: setting the polarization state of the input light of a catheter polarization-sensitive optical coherence tomography system; setting the reference light in the H and V channels of the input light and the reference light in the system to have equal intensity; acquiring the electrical signals measured at the polarization diversity point in the form of a Jones matrix to obtain the average measurement Mueller matrix; calculating the standard deviation matrix of the reference region; obtaining the depolarization Mueller matrix of the reference region; extracting the block matrix of the average measurement Mueller matrix of the reference region; calculating the average double attenuation block matrix of the reference region; constructing the average double attenuation matrix of the reference region; obtaining the pseudo-average birefringence phase delay matrix of the reference region; extracting the average depolarization matrix of the reference region from the pseudo-average birefringence phase delay matrix of the reference region using matrix decomposition; obtaining the depolarization Mueller matrix of the target region; and calculating the medium depolarization coefficient.

An imaging device for capturing an image of a scene comprises a polarization sensitive interferometer whose input light spans a wavelength range, and which is configured to output polarization specific interfered light, and which comprises an image sensor configured to capture the image based on the output polarization specific interfered light for reconstructing the color spectrum of the scene.

The invention discloses a method for eliminating autocorrelation artifacts of a polarization sensitive optical coherence tomography image. Comprising the following steps: carrying out sample detection by using a PS-OCT (Polarization Sensitive Optical Coherence Tomography) system to obtain interference signals of two polarization channels; performing inverse Fourier transform on the interference signal of one channel to obtain an airspace signal of the interference signal; finding a self-correlation horizontal fringe artifact signal with the maximum intensity in the interference signals of the airspace, and setting the intensities of other positions to be zero; calculating an unwrapping phase of the self-correlation artifact in each A-scan, and taking a minimum value of the unwrapping phase as a reference phase; interpolating the spectral phases of the original interference signals of the two polarization channels according to a reference phase; and performing inverse Fourier transform and polarization parameter calculation to obtain an OCT intensity image and a polarization image with autocorrelation artifacts eliminated. According to the image phase information-based self-correlation artifact removal method, the self-correlation artifacts in the PS-OCT image can be effectively eliminated, additional hardware facilities do not need to be introduced, and the method is simple and effective.

Integrated optical circulators that enable polarization diversity are disclosed. A photonic integrated circulator (200) can be fabricated by including multiple polarization beam splitters (220, 222) and optical polarization rotators (230, 232, 234) such that two copies of an optical signal are output at a receiver in substantially aligned polarization states. The circulator (200) can be used to facilitate bidirectional communication between photonic integrated circuit devices that are inherently polarization sensitive while reducing signal loss.

The invention relates to a method for reducing noise and decoupling local birefringence of intravascular polarization sensitive coherence tomography. The method comprises the following steps: acquiring a measurement Mueller matrix from a catheter polarization sensitive optical coherence tomography PS-OCT system; determining a reference measurement Mueller matrix; acquiring a global Mueller matrix; obtaining a medium depolarization moment according to a medium depolarization extraction method; calculating a pseudo-depolarization-free matrix; obtaining a noise depolarization matrix; calculating a standard deviation matrix for the noise depolarization matrix; obtaining a phase delay initial value delta0; generating a test noise depolarization matrix; generating a noise reduction global Mueller matrix; calculating a local Mueller matrix; calculating a local birefringence; and performing traversal calculation to obtain a local birefringence two-dimensional polar coordinate distribution diagram.

This invention discloses a high-precision angle measurement method for polarization-sensitive array radar under aperture constraints. The invention consists of two parts: array synthesis error correction and virtual aperture expansion angle measurement. Array synthesis error correction jointly models various array errors present in engineering implementation and theoretically proves that the matrix bundle generated based on the measured steering vectors of two different polarization correction sources is equivalent to the matrix bundle generated based on the real steering vector (having the same generalized eigenvalues), thus achieving accurate correction of polarization-sensitive array errors. Virtual aperture expansion angle measurement, based on the corrected data, utilizes higher-order cumulants to expand the effective aperture, breaking through the limitations of the physical aperture, thereby improving the angle measurement accuracy and resolution of the array radar. This invention can be applied to polarization-sensitive arrays of arbitrary structures, correcting all array errors present in actual engineering, and is suitable for harsh conditions with multiple errors, enabling direct application in engineering.

The invention provides a chaotic optoelectronic oscillator time delay characteristic suppression method based on the synergistic effect of a dispersion effect and a wide-spectrum light source. The laser source generates high-stability continuous optical signals, and the polarization state of the continuous optical signals is adjusted through the polarization controller so as to be matched with a polarization sensitive axis of the Mach-Zehnder modulator. The MZM serves as a nonlinear core device, and intensity modulation is carried out on feedback electric signals through a nonlinear transmission function of the MZM. An optical signal output by the MZM is divided into two paths through a first optical coupler, wherein one path enters a monitoring system and is output as a chaotic signal; and the other path enters a photoelectric feedback loop. In a feedback loop, an optical signal firstly enters an erbium-doped optical fiber amplifier for power compensation so as to offset insertion loss caused by subsequent long-distance optical fibers; and then entering a dispersion link formed by cascading a dispersion compensation optical fiber and a standard single-mode optical fiber. According to the invention, by introducing the dispersion link and utilizing the time delay characteristic related to the frequency, the suppression level is improved by about 22.6 dB, and the confidentiality and randomness of the system are greatly enhanced. The structure is simple and standardized.

The application belongs to the field of semiconductor optoelectronic devices, and discloses a polarization-sensitive neuromorphic vision sensor and a preparation method thereof.The polarization-sensitive neuromorphic vision sensor comprises, from bottom to top, a control gate, a bottom gate dielectric, a floating gate layer, a tunneling layer dielectric and a semiconductor channel layer, and a source electrode and a drain electrode are further arranged on the semiconductor channel layer, wherein the semiconductor channel layer is an in-plane anisotropic semiconductor channel layer.By using the in-plane anisotropic semiconductor channel layer as the semiconductor channel layer, the device as a whole can realize polarization light sensing function and achieve polarization-sensitive characteristics.The device can selectively perceive and process visual information, avoiding the calculation load and interference caused by the unnecessary information processing process of the redundant data flowing into the rear end on the image recognition task.

A geometric phase in-line scanning holography system for a transmissive object, includes: a polarization sensitive lens, which receives a linear polarization beam to generate a first spherical wave of right-sided circularly polarized light and a second spherical wave of left-sided circularly polarized light; a scan means for scanning the transmissive object by using an interference beam generated between the generated first and second spherical waves; a first beam splitter, which receives a beam having been transmitted through the transmissive object, so as to split the received beam into first and second output beams; first and second polarizers for polarizing the first and second output beams, respectively; and first and second photodetectors for detecting output beams having passed through the first and second polarizers.

The present invention discloses a conformal polarization sensitive array DOA estimation method based on virtual array extension technology, comprising determining a sparse non-uniform linear array from a conformal polarization sensitive array, constructing a first array flow pattern of the conformal polarization sensitive array and a second array flow pattern of the sparse non-uniform linear array; calculating a first covariance matrix according to the first array flow pattern and a spatial signal; calculating a second covariance matrix according to the second array flow pattern and the spatial signal; using the virtual array extension technology to expand the sparse non-uniform linear array to obtain a virtual uniform linear array, and constructing a third array flow pattern of the virtual uniform linear array; obtaining a virtual transformation matrix according to the second array flow pattern and the third array flow pattern; processing the second covariance matrix using the virtual transformation matrix to obtain a third covariance matrix; and performing DOA estimation according to the third covariance matrix and the first covariance matrix, thereby improving the estimation accuracy and obtaining a more accurate spatial signal angle measurement result, and the implementation is simple and low-cost.

The invention discloses a liquid crystal micromolecule auxiliary orientation full-micromolecule linearly polarized light photoelectric detector. The liquid crystal micromolecule auxiliary orientation full-micromolecule linearly polarized light photoelectric detector comprises a cathode, an electron transport layer, a photoactive layer, a hole transport layer and an anode. Wherein the material of the optical active layer comprises a P-type liquid crystal micromolecule material and an N-type micromolecule acceptor material; the full-micromolecule polarization sensitive photoelectric detection element is simple in structure, easy to prepare, low in energy consumption, capable of working at room temperature, flexible, adjustable in spectrum and low in cost, and has a huge application prospect in a light, small, integrated and spatial polarization detection system in the future.

The invention provides a dual-polarization low-pass frequency selective surface array structure with a stable wide angle. The dual-polarization low-pass frequency selective surface array structure mainly solves the problems that an existing ultra-wideband frequency selective surface is limited in passband bandwidth, sensitive in polarization and unstable in angle. The wide-angle-stable dual-polarization low-pass frequency selective surface array structure unit comprises a first dielectric substrate and conductors printed on the two sides of the dielectric substrate, wherein the conductor structures of the A surface and the B surface are formed by arranging rectangular double-opening ring units in ten layers in the longitudinal direction; and the rectangular double-opening ring units on each layer are different in longitudinal length. And aiming at dual-polarization incidence, the structure units are rotated by 90 degrees along the longitudinal direction to obtain a second dielectric substrate and a conductor structure. The ultra-wide low-frequency transmission performance and the edge steep drop characteristic are achieved, and the stable filtering effect on TE / TM electromagnetic waves incident within the angle of 70 degrees is achieved.

This disclosure relates generally to a composite reconfigurable intelligent surface system for real time beam steering and method thereof. Conventional method for real time beam steering includes bulky systems with several antenna elements and amplifiers to shape and control the beam. The present disclosure provides a composite reconfigurable intelligent surface (CRIS) for real time beam steering. The CRIS is formed from a set of constituent reflecting surfaces which in turn are generated from unit cells. These unit cells are responsible for providing individual phase reflection performance utilizing the installed varactor diode in each unit cell. The CRIS can provide a) multi-beam reflection performance, b) polarization sensitive operation, c) 2D beam steering abilities, d) real-time beam control, e) null point reduction for beam shaping requirements and f) dependable pattern stability over a suitable range of frequencies.

The invention belongs to the technical field of polarization sensitive array parameter estimation, and particularly relates to a low-complexity real-time polarization sensitive array parameter estimation method by using an external reference source, which comprises the following steps of: virtualizing a single full-component electromagnetic vector sensor as an array through a time interval, and receiving electric field three-component and magnetic field three-component signals by the sensor; selecting a narrowband complete polarization signal source, setting carrier frequency, sampling frequency, number of snapshots and real parameters of the signal source, and setting Monte Carlo simulation times and a signal-to-noise ratio; overlapping signals containing channel amplitude-phase errors and prior standard source signals are received through simulation modeling, parameters of the overlapping signals are unknown, only signal data are known, and parameters and signal models of the prior standard source signals are known; and calculating a guiding matrix by using the priori standard source signal parameter to obtain a priori standard source signal without error and noise.

The utility model relates to a special beam detector preparation device based on holographic technology. The special beam detector preparation device comprises a laser light source; the polarization beam splitter is used for splitting the laser generated by the laser light source into signal light and reference light; the first half wave plate is arranged between the laser light source and the polarization beam splitter; a first quarter-wave plate and a second half-wave plate; the angle regulator is used for emitting the signal light into a polarization sensitive material at different angles; a second quarter-wave plate and a third half-wave plate; and a polarization sensitive material. An existing polarization sensitive material is adopted, the manufacturing process is simple, the cost is low, the problems that in an existing detection method, the size is large, and the manufacturing cost is high can be solved through the material, meanwhile, the device can be manufactured only through exposure, and the machining difficulty is greatly reduced.

The application discloses a high-precision linear polarization information measuring device, and relates to the technical field of semiconductor linear polarization light information measurement. The device comprises a detection unit module, a voltage processing module and a calculation and output module. Two groups of four detectors are connected in series through a circuit, and the maximum polarization sensitive directions of the two groups of detectors are 45 degrees apart. When linear polarization light irradiation occurs under a certain power supply bias, the detection unit module generates two voltage signals, and the generated voltage signals are only related to a polarization angle. The two voltage signals pass through the voltage processing module, and a voltage signal filtered from common mode interference is obtained through a programmed gain voltage amplifier and a difference processing circuit. Finally, the processed voltage signal is transmitted to the calculation and output module. A calculation unit in the module processes and transmits the processed voltage signal to a display device through communication, so that visual linear polarization information is obtained.