289results about "Light polarisation measurement" patented technology

The invention relates to the technical field of bionic navigation orientation and positioning, in particular to a carrier course angle measuring method based on polarized light imaging in a non-Rayleigh atmosphere. Comprising the steps of real-time sky polarized light imaging, atmospheric polarization mode resolving based on Mueller matrix imaging, non-Rayleigh polarization information interference removal, polarization orientation resolving based on Rayleigh scattering, space projection conversion and sun position information resolving. Alignment information of the sun in a carrier coordinate system is obtained by utilizing a Rayleigh scattering model and actual sky polarization imaging, and then a carrier course angle is obtained according to the orientation of the sun in a local geographic coordinate system, so that an orientation function is realized; meanwhile, the error influence caused by image registration and time-sharing rotation measurement of the multi-view-field polarization detector and the interference of environmental factors on a single point are avoided, the method can adapt to sunny and cloudy weather, is also applicable to cloudy and other non-Rayleigh weather, and is wide in application range.

The invention discloses a broadband full-Stokes polarization imaging device based on non-orthogonal four-channel polarization beam splitting, which comprises a dielectric substrate, a non-orthogonal polarization beam splitting metasurface and a focal plane detection array, and is characterized in that the non-orthogonal polarization beam splitting metasurface is composed of a plurality of sub-wavelength unit structures; the sub-wavelength unit structure is a single-layer anisotropic medium nano-column array and is configured to perform intrinsic-loss-free non-orthogonal four-channel beam splitting on incident light and form four spatially separated focuses on the same focal plane, and polarization states corresponding to the four channels form a regular tetrahedron measurement base on a Poincare sphere; therefore, full Stokes parameter measurement is completed by four pixels; the sub-wavelength unit structure forms a super-pixel unit, and the super-pixel unit is aligned and integrated with a focal plane detection array in a two-dimensional array form to form a compact polarization camera facing focal plane segmentation. The device is simple in structure, easy to integrate with the CMOS front end, small in device size, low in power consumption and high in mass production feasibility.

The invention discloses a vibration phase bit coding test method and device based on a graphene parameter resonator, and relates to the technical field of resonators. The method comprises the following steps: applying an initial bias voltage and a parameter excitation signal, and setting the driving frequency of the parameter excitation signal to be twice of the resonant frequency corresponding to the initial bias voltage; continuously increasing the parameter excitation signal until the resonator enters a parameter vibration state; applying a direct driving signal, and setting the driving frequency of the direct driving signal as the resonant frequency corresponding to the initial bias voltage; selecting bias voltage values on two sides of the initial bias voltage, and scanning from low to high and from high to low to obtain vibration phase change; and obtaining the vibration phase bit code of the to-be-measured graphene parameter resonator according to the vibration phase change. Information is stored through mechanical vibration of the graphene parameter resonator instead of utilizing charge or electron spinning, electromagnetic interference and phase noise are effectively avoided, and the graphene parameter resonator is more stable at high temperature and suitable for a high electromagnetic noise environment.

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.

Embodiments can relate to systems and methods for generating hyperspectro-polarimetric images. The system can include a metasurface having a plurality of super pixels configured to encode spectral and polarization image data into spatial intensity distributions. The system can include an image capture device having at least one image sensor and a plurality of subsets of pixels configured to capture the spatial intensity distributions encoded by the metasurface. The system can include a processor in communicative connection with the image capture device. The processor can be configured to receive pixel data from the image capture device, generate captured image input data based on the pixel data, and access at least one computational reconstruction model configured to decode the captured image input data, and generate image output data based on the decoded captured image input data.

The invention discloses an infrared and ultraviolet flame detector with multiple safety redundancy and an anti-explosion control method, and relates to the technical field of flame detection, and the anti-explosion control method comprises the steps: S1, obtaining the multi-source fire data of a target object through a signal obtaining module; s2, analyzing the multi-source fire data through a dynamic coupling adjustment module; s3, performing time domain association verification on the first monitoring data through a time domain continuity verification module, and generating second monitoring data; and S4, the grading execution module sends an alarm signal according to the second monitoring data and adopts grading execution processing. Through ultraviolet polarization degree and dielectric constant dual-threshold triggering, interference of the metal reflective layer is stripped, so that the smoldering detection rate of a covered scene is increased from less than or equal to 60% to more than or equal to 95%; and moreover, the smoldering authenticity is subjected to cross validation through the bidirectional verification module, so that the problem of missing report of a traditional flame detector caused by a covering effect of'reflective interference 'on'smoldering monitoring' is avoided.

An integrated configurable photodetector with an ultra-high circular polarization extinction ratio and a preparation method therefor are provided. The photodetector includes a metal reflective layer, a dielectric layer, an electrode layer, and a two-dimensional material layer. The electrode layer includes symmetrically arranged Z-shaped metallic optical antenna arrays which are respectively integrated with a source electrode and a drain electrode and have opposite chirality. The photodetector operates at zero bias state, and a photo-response is photovoltaic effect, hot electron injection, photo-thermoelectric effect and so on induced by a Schottky junction composed of the source electrode, the drain electrode and the two-dimensional material. By adjusting the distribution of the incident light in the source and drain electrode regions, under specific Circularly polarized light, photocurrents of equal magnitude but opposite directions cancel each other out, resulting in a net output of zero and significantly reducing noise.

The present invention discloses a polarization camera system that integrates a polarization sensor with a homogeneous dispersive retarder to detect and measure simultaneously the four components of the Stokes vector of polarized light. Unlike existing methods that require complex setups or expensive components, this approach uses a single sensor setup, combining the division of focal plane method with wavelength sensitivity inherent in many camera sensors. The system (1) comprises: a polarization sensor (2) having a polarizer array (2a) and a color channel filter (2b); a photodiode array (2c) configured to measure at least four intensities; a light entrance (4); a microprocessor (5); a first homogeneous dispersive retarder (3). The first homogeneous dispersive retarder is configured to introduce wavelength-dependent retardation δ(λ) to the incident polarized light, so that [δ(λi) ≠ δ(λj)]; and, the microprocessor is configured to calculate a complete Stokes vector of incident polarized light from the measured intensities.

Systems and methods for object and material recognition are provided and include a hyperspectral infrared camera that captures a three-dimensional image of an object and black-body emissions data indicating a polarization of black-body radiation emitted from the object. An image processing device accesses a database of expected polarization signatures of black-body emissions from materials at different temperatures and determines a material of the object based on (i) the black-body emissions data indicating the polarization of the black-body radiation emitted from the object, (ii) an ambient temperature of the environment of the system, and (iii) the database of expected polarization signatures of black-body emissions from a plurality of materials for different temperatures.

This suppresses the generation of ghosting in the optical path from the polarization controller to the multiplexing optical coupler. [Solution] The extinction ratio monitoring type polarization rotation system 10 is installed in the optical path between a third optical coupler 3 that is incident on the measurement light from the light source and emits reflected light L2 reflected by the optical circuit under test, and a fourth optical coupler 4 that combines the reference light L1 and the reflected light L2. It includes a polarization controller 11 that can change the polarization state of the incident light in various ways and controls the emitted light to a predetermined polarization state, a branching unit 12, a polarizer unit 13, and a monitor unit 14 that monitors the extinction ratio. Based on the output of the monitor unit 14, the set values ​​of the polarization controller 11 that result in the output of the maximum light intensity and the output of the minimum light intensity where the polarization states are orthogonal are stored in the memory unit. After switching these settings, the intensity of each beat signal is measured using a differential amplifier 7, making it possible to detect defective parts of the optical circuit X under test without false detection.

The application relates to the field of spectrum measuring instruments, in particular to a circularly polarized spectrum measuring instrument capable of synchronous adjustment, which comprises an angle table installed on the surface of a base, an input box and a receiving box installed on the angle table near the center line on both sides, laser emitters and receiving plates respectively installed on one side of the input box and the receiving box, input polarizers and receiving polarizers respectively installed in the input box and the receiving box for emitting and receiving circularly polarized light, and a detection table arranged on the surface of the base and used for bearing a detected object. Laser emitters and receiving plates respectively arranged on one side of the input box and the receiving box are used for separately detecting incident and outgoing angles, the incident and outgoing angles of polarized light are simulated before sample detection, synchronous adjustment of the input polarizer and the receiving polarizer is carried out, the detection automation degree of the circularly polarized spectrum measuring instrument is further improved, and the detection efficiency is improved to a certain extent.

The application provides a tunable infrared polarization detector based on a phase change material, comprising a photodetector and a micro-polarization array integrated on the photodetector, wherein the micro-polarization array comprises a plurality of polarization units in different polarization directions; the polarization unit comprises a silicon dioxide substrate and a polarization maintaining element atom and a half-wave plate-like polarization conversion element atom deposited on the silicon dioxide substrate; the polarization maintaining element atom is a nanometer cylinder deposited on the silicon dioxide substrate by using a phase change material; and the half-wave plate-like polarization conversion element atom is a nanometer cuboid deposited on the silicon dioxide substrate by using a phase change material. The application can easily realize polarization light modulation by controlling the polarization characteristics of incident light through super surface design.

The invention provides a polarization signal amplification photoelectric detector based on gallium oxide and a preparation method thereof. The polarization signal amplification photoelectric detector based on gallium oxide comprises a gallium oxide single crystal substrate; the gallium oxide photoelectric detector is arranged on the gallium oxide single crystal substrate, and the gallium oxide photoelectric detector is configured to generate different photoelectric responses to the solar-blind ultraviolet light in different polarization directions by using the in-plane anisotropy of a gallium oxide material and output electric signals changing along with the polarization directions; the gallium oxide transistor is arranged on the gallium oxide single crystal substrate, a grid electrode of the gallium oxide transistor is electrically connected with the signal output end of the gallium oxide photoelectric detector so as to receive an electric signal changing along with the polarization direction to serve as input of the grid electrode, the gallium oxide transistor works in a sub-threshold region, and the change of the polarization direction causes the change of grid electrode voltage; and an electric signal with enhanced amplitude is output from the drain electrode of the gallium oxide transistor, so that on-chip amplification of the polarization signal is realized.

An uncooled infrared polarization detection pixel structure, a chip, and a detector. By setting a light-passing region of a grating layer to a regular polygon corresponding to a polarization direction, it can be ensured that gratings (111) in the light-passing region that correspond to different polarization directions have the same shape except for the different polarization directions, thereby ensuring that the grating layer has the same transmission efficiency for incident light of multiple preset polarization directions. By setting a pixel layer to a regular polygon corresponding to a light-transmissive region, and providing absorption units (8) on the surface of the pixel unit, the influence of a polarization-selective absorption characteristic caused by an electrode (71) in the pixel layer can be eliminated, so that the light absorption of infrared detection pixels is insensitive to polarization, thereby ensuring that the response of the pixel layer to light in different polarization directions is consistent, and avoiding the problem of response non-uniformity.

The application discloses a multi-band infrared polarization selection photoelectric detection array and a preparation method thereof in the field of photoelectric devices, and the photoelectric detection array comprises a transparent insulating substrate, and array-distributed internal unit pixel detectors are arranged above the transparent insulating substrate, wherein the internal unit pixel detectors comprise a gate electrode, an insulating layer, an active layer, a source-drain electrode and a photosensitive layer, the gate electrode is arranged above the transparent insulating substrate, the gate electrode is covered with the insulating layer, the active layer is arranged above the insulating layer, and the photosensitive layer and the source-drain electrode are arranged above the active layer. The photoelectric detection array can be combined with a polarimetry instrument and a chemical analysis platform device in aspects such as component identification and concentration detection of a liquid solution; the design and preparation of the field effect transistor photoelectric polarization selection device can simultaneously cancel a polaroid, realize integration of polarization angle detection and wavelength absorption detection, and can monitor the component and the concentration of the solution in a characteristic waveband of the solution.

The present disclosure relates to an image processing device and method by which a decrease in coding efficiency can be suppressed. A raw image, which is an output from a sensor having a pixel array constituted by a plurality of types of pixels for detecting incident lights having mutually different optical characteristics including at least a polarization angle characteristic, is reconfigured by use of the optical characteristics of the incident lights including at least the polarization angle characteristic, thereby generating a polarization angle characteristic reconfigured image constituted by the pixel values of the pixels having detected the incident lights for which at least the characteristic values of the polarization angle characteristic are identical with each other, and the generated polarization angle characteristic reconfigured image is encoded. The present disclosure can be applied, for example, to an image processing device, an encoding device, a decoding device, electronic equipment, an image processing method, or a program.

A polarization-sensitive encoder, a polarimetric camera, and a method for polarimetric imaging in which the encoder includes a two-dimensional (2D) polycrystalline photonic-crystal film with nanofiber, multi-scale, self-assembled structures.

The present description relates to a polarizing filter (PF) intended to be disposed opposite an image sensor comprising a plurality of pixels, the filter comprising, for each pixel, a polarizing structure (111) comprising a plurality of parallel metal bars (701), each bar being coated with an absorbing stack (703) comprising: - a tungsten layer (705); - a silicon layer (707), coating the tungsten layer; and - a dielectric layer (709), coating the silicon layer.

This application relates to the field of electromagnetic waves, specifically providing a polarization state detection method and apparatus. The method utilizes a polarization state detection device for detection and includes: inputting the beam to be detected into the polarization state detection device to obtain orthogonal first and second Bessel beams; using a polarizer to obtain the azimuth angles corresponding to the interference weakening or enhancement regions in the interference patterns of the first and second Bessel beams, and determining the phase difference between the first and second Bessel beams based on the azimuth angles; using the polarizer to obtain the first amplitude of the first Bessel beam and the second amplitude of the second Bessel beam, respectively, and obtaining the amplitude ratio based on the first and second amplitudes; and calculating the polarization state of the wave to be detected based on the phase difference and amplitude ratio. This polarization state detection method simplifies the polarization state detection process for terahertz and millimeter waves, promoting the miniaturization and integration of detection equipment.

The invention relates to the technical field of optical polarization state measurement, in particular to a laser polarization state real-time measurement analyzer which comprises collimators, a non-polarization beam splitter, a 1 / 4 wave plate, a compensation module and a polaroid. The first non-polarization beam splitter divides two light beams into a second non-polarization beam splitter, a 1 / 2 wave plate and a third non-polarization beam splitter respectively, and the second non-polarization beam splitter divides two light beams into a second collimator and a third collimator respectively through a first polaroid and a second polaroid; the third non-polarization beam splitter divides two paths of light beams into a fourth collimator and a 1 / 4 wave plate through a third polaroid, the fourth polaroid enters a fifth collimator, the second collimator, the third collimator, the fourth collimator and the fifth collimator are connected to an oscilloscope through four photoelectric detectors, and the upper computer collects data of the oscilloscope and calculates the real-time polarization state of the laser. The method is simple, high in precision and low in cost, and realizes real-time measurement of the laser polarization state.

The invention discloses a perfect vector and scalar vortex beam generation device, a representation device and a representation method, and the perfect vector and scalar vortex beam generation device comprises a light source system which is used for outputting left-handed and right-handed circularly polarized light; the non-polarization beam splitting flat plate is used for splitting the left-handed and right-handed circularly polarized light into transmission generation light paths; the Q wave plate is located on the generation light path; the phase delay system comprises a reflecting mirror IV located on the generation light path and two quarter-wave plates with adjustable fast axis included angles; the light path conversion system comprises a conical lens and a thin convex lens which are located on the generation light path, and the conical lens is close to the non-polarization beam splitting flat plate; the invention provides a low-cost and easy-to-integrate high-quality perfect vector and scalar vortex beam generation and characterization device and a corresponding method, which are used for realizing efficient generation of perfect vector and scalar vortex beams.

A device (1) for determining characteristics of a surface of a test object (4) is provided. The device (1) comprises a light source (2) for irradiating a test object (4) with a light beam (LB1), at least one angle-sensitive optical element (6) for reflecting and / or transmitting the light beam (LB2) reflected and / or transmitted by the test object (4), an adjustment unit (7) for adjusting an orientation of the at least one angle-sensitive optical element (6) with respect to the light beam (LB2) reflected and / or transmitted by the test object (4), a detection unit (9) for detecting the light beam (LB3) reflected and / or transmitted by the at least one angle-sensitive optical element (6), and an analysis unit (10). The analysis unit (10) is configured to receive (S3) detection data provided by the detection unit (9), wherein the detection data comprises data of the detected light beam (LB3) reflected and / or transmitted by the at least one angle-sensitive optical element (6) at multiple different orientations of the at least one angle-sensitive optical element (6), analyze (S4) the received detection data in order to identify differences between the data at the multiple different orientations of the at least one angle-sensitive optical element (6), and determine (S5) the characteristics of the surface of the test object (4) based on the identified differences.

This invention provides a reflective polarization-separating diffraction element usable over a wide wavelength range including the ultraviolet region, and an optical measuring apparatus incorporating the element. The reflective polarization-separating diffraction element comprises: a substrate (1); a reflective surface (2) formed on the surface of the substrate (1); and a grating-like structure (3) disposed on the reflective surface (2), exhibiting structural birefringence (Δn). * The grating structure (3) consists of four patterned grating structures (3A, 3B, 3C, and 3D), each with a different azimuth angle. Multiple patterned grating structures (3A, 3B, 3C, and 3D) are arranged along a predetermined direction on the reflecting surface 2 in a manner that causes the azimuth angle of the grating structure to change periodically.

A kind of ultra-short pulse synchronization testing device and method based on optical Kerr effect. After the high-power density ultra-short pulse of multiple beams to be synchronized passes through optical Kerr medium, induced birefringence effect occurs, which instantaneously changes the polarization characteristics of the reference light beam, and the synchronization between multiple beams of ultra-short pulses is measured by the amplitude or phase change of the reference signal pulse. This method can realize the synchronization measurement of ultra-short pulses with large angle at the target point, and has the advantages of high measurement accuracy, good repeatability and high stability.

To provide a novel technique for monitoring a polarization state of an optical reception signal.SOLUTION: A polarization state monitoring device calculates polarization state change vectors representing polarization states of an optical reception signal in respective different periods, and specifies features of change in polarization state of the optical reception signal based upon directions of the respective polarization state change vectors, lengths of the respective polarization state change vectors, or both of them.SELECTED DRAWING: Figure 2

The utility model provides a device for rapidly measuring the polarization direction of a laser crystal, which relates to the technical field of laser and comprises a laser pumping source, a crystal clamping jaw, a polaroid, a stepping motor, a power detector and a charging tray, the crystal clamping jaw is arranged on the laser pumping source, the polaroid is located between the laser pumping source and the crystal clamping jaw and installed on a rotating device connected with a rotating shaft of the stepping motor, and the power detector is located above the laser pumping source and used for receiving a laser beam emitted by the laser pumping source and used for exciting a laser crystal; and the charging tray is positioned on one side of the crystal clamping jaw and is used for placing a laser crystal. The polarization direction of the laser crystal can be quickly confirmed by utilizing automatic equipment and a precisely controlled rotary polaroid in cooperation with the change of measurement power, and the polarization direction test precision of the laser crystal can be effectively improved.

Provided is a method capable of precisely, reproducibly and directly measuring, by an ellipsometry method, optical constants (refractive index n, extinction coefficient κ) of a fluorine-containing organosilicon compound thin film having a homogeneous surface with a small surface roughness and haze value. The method for measuring the optical constants of the thin film of the fluorine-containing organosilicon compound, includes: a step of forming the thin film of the fluorine-containing organosilicon compound on a base material, the thin film having, as surface roughnesses, an arithmetic mean roughness of smaller than 1.0 nm and a root mean square roughness of smaller than 2.0 nm, a haze value of smaller than 0.3 and a film thickness of 3 to 10 nm; and a step of measuring the optical constants of the thin film formed on the base material by the ellipsometry method.

Existing Mueller Matrix polarization techniques that rely only on polarization properties are insufficient for accurate characterization of transparent objects. Embodiments of the present disclosure provide a method and system for Mueller Matrix polarimetric characterization of transparent object using optical properties along with the polarization properties to accurately characterize the transparent object. The polarization properties of are derived from a decomposed Mueller matrix element. Additionally, the method derives the optical properties by further subjecting the decomposed Mueller matrix element to Fresnel's law-based analysis and a reverse Monte Carlo analysis to extract optical properties such as a material refractive index and a material attenuation index. Optical properties vary with changes in the material property caused due to several factors such as manufacturing defect, aberration, inclusion of an impurity such as bubble or dust etc. Thus, considering the optical properties along with the polarization properties enables enhanced, accurate characterization of the transparent object.

The application relates to the technical field of atomic magnetometer and discloses a detection device and method of orthogonal light beams, the detection device of the orthogonal light beams comprising a substrate; a polarization beam combination device used for combining pump light and detection light received in an atomic magnetometer, rotating the pump light or the detection light by 90 degrees, and making the pump light and the detection light exit after being combined; a detector used for collecting a light spot image of the combined pump light and detection light, the light spot image comprising a first light spot generated based on the pump light and a second light spot generated based on the detection light; and a processing unit used for acquiring the light spot image, extracting the center coordinates of the first light spot and the second light spot in the light spot image, and determining the orthogonal state of the pump light and the detection light according to the center distance between the center coordinates of the two light spots. The application can realize quantitative evaluation of the orthogonal state of the pump light and the detection light, thereby providing intuitive and accurate feedback for optical alignment, reducing assembly errors, and improving the overall performance of the atomic magnetometer.