427results about "Light polarisation measurement" patented technology

The present disclosure provides an optical component, which may be a metasurface grating, including (a) a substrate; and (b) an array of subwavelength-spaced phase-shifting elements, which are tessellated on the substrate to produce, when illuminated with a polarized incident light, a diffracted light beam with a distinct polarization state for each of a finite number of diffraction orders, wherein the finite number is 2 or more.

The invention relates to a sun meridian detection and course angle real-time calculation method based on polarized light field vector characteristics, and aims to solve the problems that a traditional sun meridian detection method is easily interfered in low signal-to-noise ratio scenes such as haze and cloud layer shielding, lens distortion causes polarization angle errors, the false detection rate is high, and the calculation accuracy is high. In order to solve the problems that the real-time performance and robustness of course calculation are affected due to the fact that single polarization angle information is difficult to fully reflect the sun direction, polarization parameter calculation is carried out by utilizing a multi-channel polarization image, and the sun meridian is detected by adopting Hough transform through fisheye lens correction, bilateral filtering and candidate region screening, so that the real-time performance and robustness of course calculation are improved. And a multi-point inversion method is combined to accurately obtain a sun vector and a zenith angle and an azimuth angle thereof, and finally a course angle is calculated in real time. The problems of imaging distortion and insufficient real-time processing in the traditional sun positioning technology can be effectively solved, and a powerful navigation positioning technical guarantee is provided for the fields of unmanned aerial vehicles, autonomous navigation, polarized light navigation and the like.

The present invention relates to a real-time heading angle calculation method based on the vector characteristics of the polarized light field. Aiming at the problems of traditional solar meridian detection methods, such as being easily disturbed in low signal-to-noise ratio scenarios like haze and cloud cover, the occurrence of polarization angle errors and high false detection rates caused by lens distortion, and the difficulty of using single polarization angle information to fully reflect the solar direction, which affects the real-time performance and robustness of heading calculation. This method calculates polarization parameters by using multi-channel polarization images.

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 provides a distributed optical fiber sound wave sensing chip, system and method based on polarization state detection. The chip comprises an optical pulse source module, a first spot size converter, a second spot size converter and a high-speed polarization analysis module, the optical pulse source module generates pulse light and outputs the pulse light to the optical fiber circulator and the sensing optical fiber through the first spot size converter; the second spot size converter receives scattered light returned from the sensing optical fiber and the optical fiber circulator and inputs the scattered light into the high-speed polarization analysis module; the high-speed polarization analysis module comprises a polarization beam splitting rotator, four interference structures and six photoelectric sensors; the polarization beam splitting rotator divides the scattered light into a TE mode and a TM mode, rotates the TM mode to the corresponding TE mode and then outputs the scattered light through two output ports of the polarization beam splitting rotator; each output end of the polarization beam splitting rotator is connected to one photoelectric sensor and one input end of the four-way interference structure; the four-way interference structure is provided with four output ends which are respectively connected to the rest photoelectric sensors.

The invention discloses an all-solid-state snapshot full-Stokes parameter measurement and imaging enhancement sensor device. The all-solid-state snapshot full-Stokes parameter measurement and imaging enhancement sensor device comprises a micro-lens array module, a liquid crystal phase modulation module, a polarization wire grating array module and an image sensor module. The micro lens array module is composed of a plurality of micro lenses which are arranged in a two-dimensional mode, and incident light is focused on the photodiode of each pixel. The liquid crystal phase modulation module is composed of two high-speed liquid crystal variable phase delayers, and active phase modulation is carried out on the polarization state of incident light. Polarized light information in four polarization directions can be obtained only through single shooting in the polarization wire grating array module. The image sensor module calculates the full Stokes parametric polarization characteristics of the incident light. According to the invention, full-polarization information measurement of incident light can be realized only through single exposure, and a polarization enhancement mode is switched after measurement is completed, so that the imaging efficiency of the sensor in dark light scenes such as weak contrast target detection is greatly improved.

The invention provides a 2-micron high-order Poincare sphere vector vortex ultrafast laser polarization detection method, which comprises the following steps of: performing out-cavity and out-cavity beam splitting on 2-micron high-order Poincare sphere vector vortex ultrafast laser through a beam splitting module, directly detecting light intensity spatial distribution by one beam, and dynamically regulating and controlling the out-cavity of a polarization state by the other beam after the other beam enters a polarization regulation and control module; the computer communicates with the ESP32 development board to control the hollow rotary displacement table to change the forward included angle between the fast axis and the x axis of the vortex quarter-wave plate so as to change the polarization state of incident light; through the ultrafast laser polarization beam splitter, the polarization state of passing light is limited, and horizontal line polarized light perpendicular to a beam splitting surface passes through the ultrafast laser polarization beam splitter; dynamically detecting real-time data of light intensity which is dynamically adjusted outside the cavity through the polarization regulation and control module each time through a light intensity detection module; and the polarization analysis module receives regulation and control parameters of the polarization regulation and control module and light intensity parameters of the power detection module, analyzes the polarization state of a light beam input into the system, and completes 2-micron high-order Poincare sphere vector vortex ultrafast laser polarization detection.

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.

The invention relates to the technical field of quantum measurement, and discloses a high-speed arbitrary adjustable unbiased generalized measurement device for light quantum polarization bits, and the device comprises a high-speed adjustable z-axis rotation device; a high-speed adjustable y-axis rotating device; a measurement intensity high-speed adjusting device; a sigma z basis vector projection measurement device; a unit measuring device; and an electronics post-processing module. According to the invention, sigma z base vector projection measurement is constructed through an optical fiber polarization beam splitter (FPBS), unit measurement is constructed through an optical fiber beam splitter (FBS), and sigma z base vector unbiased generalized measurement with high-speed adjustable measurement intensity is realized in combination with a measurement intensity high-speed adjusting device and an electronics post-processing module. And the rotation of the measurement basis vector on the Bloch ball is realized through the high-speed adjustable z-axis rotating device and the high-speed adjustable y-axis rotating device, so that the high-speed arbitrary adjustable unbiased generalized measurement is realized.

Various embodiments may provide a photodetector pixel. The photodetector pixel may include a chiral plasmonic molecule array configured to generate heat upon incidence of an electromagnetic wave on the chiral plasmonic molecule array. The photodetector pixel may also include a thermoelectric layer configured to generate an electric current or voltage upon transfer of heat from the chiral plasmonic molecule array to the thermoelectric layer. The chiral plasmonic molecule array may include a metal layer, one or more nanostructures, and a dielectric spacer such that the dielectric spacer is between the metal layer and the one or more nanostructures. The one or more nanostructures may include one or more left hand (LH) chiral metamaterial nanostructures, one or more right hand (RH) chiral metamaterial nanostructures, or one or more left hand (LH) chiral metamaterial nanostructures and one or more right hand (RH) chiral metamaterial nanostructures.

The invention discloses a light formula generation method and system based on dendrobium officinale polysaccharide synthesis, particularly relates to the technical field of plant factory light environment regulation and control, and is used for solving the technical bottlenecks of polarization state instability and insufficient light signal penetration uniformity caused by environment interference in existing polarization state light regulation and control. A polarization state distortion area is sensed in real time based on Stokes parameters, physical interference factors of a reflection path and medium scattering are extracted, polarization state compensation parameters are generated through cross-correlation modeling, a laser light source direction angle and a phase delay amount are cooperatively optimized, and re-calibration of a distortion matrix is triggered through colorimetric method penetration uniformity verification; through closed-loop logic of physical interference traceability and dynamic compensation, the polarization stability of optical signals and the penetrability of plant tissues are synchronously improved, and efficient cooperation of a dendrobium officinale light response mechanism and a polysaccharide synthesis path is guaranteed.

An imaging device includes an optical element including a transparent substrate, and a plurality of structures disposed on or in the transparent substrate in a plane direction of the transparent substrate, an imaging element in which a plurality of pixels including photoelectric conversion elements are disposed, and a signal processing unit configured to generate an image signal based on an electrical signal acquired from the imaging element, wherein the optical element forms an image in which a point spread function of each wavelength is convoluted on a plurality of pixels corresponding to each polarized light component depending on polarized light components by outputting light in a state in which the optical element has different point spread functions for respective wavelengths, the plurality of structures have the same height in a side view, and the signal processing unit reconstructs an image in which a point spread function is convoluted.

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.

The invention relates to the technical field of optical design, and discloses a double-beam differential measurement device and method for the polarization sensitivity of a metasurface grating, and the method comprises the steps: dividing a pre-generated light beam into a first light beam and a second light beam through an optical fiber coupler, carrying out the dynamic switching of the polarization state of the second light beam, and obtaining a second incident light beam, adjusting the first light beam based on the second incident light beam to obtain a first incident light beam; enabling the first incident light beam to pass through a first path without the metasurface grating, enabling the second incident light beam to pass through a second path comprising the metasurface grating, and obtaining a first output light beam and a second output light beam; performing time domain difference on the first output light beam and the second output light beam, and calculating to obtain a multi-polarization-state differential signal; correcting the multi-polarization-state differential signal through a preset differential correction mechanism to obtain a corrected differential signal; calculating the polarization sensitivity of the metasurface grating according to the corrected differential signal; according to the invention, the accuracy of the calculated polarization sensitivity of the metasurface grating can be improved.

Systems and methods are disclosed herein that include a polarization sorting metasurface microlens array device. In a particular embodiment, a polarization imaging device is provided. A polarization imaging apparatus includes: an image light source; a metasurface lenslet array including a plurality of repeating metasurface lenslets, where the plurality of repeating metasurface lenslets include a plurality of first metasurface lenslets configured to diffract image light into first polarized light in a first direction and second polarized light in a second direction; and an image sensor in an optical path of the first polarized light and the second polarized light, and wherein the image sensor includes a plurality of image sensing units including a first image sensing unit positioned to sense the first polarized light and a second image sensing unit positioned to sense the second polarized light.

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.

Provided is a polarization image measurement device that can be further reduced in size. This polarization image measurement device comprises: an infrared light source (12) that emits infrared light to an inspection target; a lens (14) that causes the infrared light emitted from the infrared light source (12) to diverge; a circular polarizer (16) with a thickness of 1 mm or less that converts the divergent infrared light from the lens (14) into circularly polarized light; a first image sensor (18) that receives reflected light obtained when the circularly polarized light obtained by the conversion by the circular polarizer (16) is reflected off an inspection target (P); and a polarization separation filter (20) that is disposed on an optical path between the inspection target (P) and the first image sensor (18) and that separates the reflected light into a plurality of polarized rays of light.

A method of generating object surface texture in thermal infrared images is disclosed which includes receiving heat radiation from a scene by a spectropolarimetric imaging system, generating a plurality of spectral frames associated with the scene, each frame having a plurality of pixels, for each pixel from the generated plurality of spectral frames, extracting spectral information associated with the scene, including pixel-specific temperature representing an object's temperature, and thermal texture factor representing the object's texture, for each of a plurality of materials having a specific emissivity in a library, generating reference spectral information as a function of temperature and thermal texture, matching the extracted spectral information for each pixel from the generated plurality of spectral frames to the generated reference spectral information using a statistical method to minimize the associated variation, and extracting spectral metadata from the matched reference spectral information for the associated material based on the match.

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.

Certain examples are directed to methods for detection of anomalies in semiconductor thin-film materials, such as strains, defects and the like, that may precipitate defects in semiconductor processing steps and may adversely impact device and system-level functionality, processing, and yields. Certain methods use filtering optics to provide a set of filter-separated light beams respectively associated with different polarization states of polarized light directed towards a semiconductor-related material sample, and providing a set of sample-characterizing response data based on factors such as sets of polarization-state values, different wavelengths associated with the polarization states, and / or light-incidence angles characterizing separation of the different polarization states. Based on these factors, the types and severities of such anomalies may be analyzed and the related defects remedied.

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.