555results 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.

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.

The invention relates to the technical field of molecular optoelectronic devices, and particularly discloses a chiral molecule, a chiral molecule device, a preparation method and circularly polarized light detection application. Wherein the chiral molecule is a functional molecule which contains a chiral center and has a D-A-D structure type, and the chiral molecule device comprises a silicon substrate, an aluminum oxide dielectric layer, a metal electrode, a graphene point electrode and an RE-PDI molecule and is applied to circular polarized light detection. The invention designs and synthesizes a functional molecule RE-PDI which contains a chiral center and has a D-A-D structure type, and the functional molecule RE-PDI is assembled between graphene point electrodes with nano gaps through a chemical decoupling method. By using the distinguishing response of RE-PDI molecules to different types of circularly polarized light, distinguishing detection and dynamic periodic adjustable response to left-handed and right-handed circularly polarized light can be stably realized.

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.

A polarization splitting device includes a substrate, and a polarization splitting layer having a structure element pattern including a plurality of structure elements each having two-fold rotational symmetry, and formed on an upper surface of the substrate. The polarization splitting layer splits first to sixth polarization components included in object light, and focuses respectively at first to sixth focal positions on a focal plane. The structure element pattern includes a first structure element pattern for focusing the first and second polarization components, a second structure element pattern for focusing the third and fourth polarization components, and a third structure element pattern for focusing the fifth and sixth polarization components, and a pattern constituted by a first structure element, a second structure element, and a third structure element is set as a unit pattern, and a plurality of unit patterns are two-dimensionally arranged.

The invention relates to the technical field of electroluminescent photoelectric devices, in particular to a photoelectric device based on electro-circular polarization luminescence of a single chiral rare earth complex molecule and a preparation method of the photoelectric device. A spin Hall effect detection layer of the photoelectric device comprises a platinum film and a non-magnetic metal detection electrode; the non-magnetic metal detection electrode is arranged on the side edge of the platinum film in the length direction; the graphene point electrode is arranged on the side edge of the upper surface of the insulating layer in the width direction, the two ends of the molecular heterojunction are connected with the graphene point electrode through amido bonds to form a graphene point electrode-molecular heterojunction array, and the magnetic metal electrode is arranged on the outer side edge of the upper surface of the graphene point electrode in the width direction. According to the photoelectric device, the excellent photoelectric property of the rare earth complex is combined with the molecular electronics technology, the detection sensitivity of the photoelectric device on the single molecule level is improved, the preparation method is mild in reaction condition and easy to operate, and application and popularization of the photoelectric device are facilitated.

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.

The present application provides an underwater point source polarization light detection device and a method for measuring a heading angle thereof, which are applied to the field of polarization navigation technology, wherein the polarization light detection device comprises a base, a rotating detection platform arranged on the base, and three groups of polarization light detection modules arranged on the top of the rotating detection platform, wherein the three groups of polarization light detection modules adopt the same structure and each group of detection modules is composed of a pair of polarization analysis channels whose transmission directions are perpendicular to each other, the other two groups of detection modules are positioned so that the polarization light detection directions of the two are left-right symmetrical about the zenith polarization light detection direction in the same plane and the angles between the two and the zenith polarization light detection direction do not exceed 5°, the rotating detection platform is configured to be able to rotate 360° around the axis where the zenith polarization light detection direction is located, and the heading angle measurement method using the detection device has the advantages of good adaptability to underwater environments and a small number and type of polarization analysis channels used.

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 a 2-micron base-order ultrafast laser polarization detection device and method based on a Poincare sphere. The device comprises a polarization regulation and control module, a power detection module and a polarization analysis module, the polarization regulation and control module comprises a quarter-wave plate, an electric rotary displacement table and a polarization beam splitter; the power detection module comprises a power detector; the polarization analysis module comprises a data processor; and the data processor is respectively connected with the electric rotary displacement table and the power detector. The method comprises the following steps: placing the electric rotary displacement table and the quarter-wave plate on an x-o-y plane; enabling the x direction and the y direction of the input laser to generate # imgabs0 # phase difference; adjusting the polarization beam splitter to enable the polarization state of the laser penetrating along the optical axis to be only in the vertical direction; and calculating Stokes parameters and polarization state data, outputting and storing the calculated data, and meanwhile, displaying the laser polarization state data and polarization state images. According to the device and the method, efficient, accurate and rapid detection operation of the 2-micron wave band ultrafast laser polarization state can be realized.

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 target characteristic measuring and sensing mechanisms, in particular to a full-angle multi-mode polarization characteristic measuring and sensing mechanism and a testing method thereof. The device comprises an outer ring light source module, a middle ring camera module and an inner ring sample platform, and an outer ring light source device is arranged on the outer ring light source module and used for conducting full-angle light source irradiation on a sample target; a middle ring polarization camera is arranged on the middle ring camera module and is used for carrying out full-angle polarization camera acquisition on the sample target; and the sample target is arranged on the inner ring sample platform. And the outer ring light source module, the middle ring camera module and the inner ring sample platform are coaxially arranged. According to the full-angle multi-mode polarization characteristic measurement sensing mechanism, the polar coordinate type double-circumference guide rail design is adopted, the collection device and the illumination device are arranged on the guide rails, the target characteristic sensing requirements of different targets, different illumination, different temperatures and different detection modes in 360 degrees of the upper hemisphere of the target can be met, and the full-angle multi-mode polarization characteristic measurement sensing mechanism has the remarkable advantages of full angle and multiple modes.

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.

Apparatus includes a sample holder with a cavity and a plurality of devices configured to hold a curvature of a curved substrate in a fixed configuration. Apparatus includes two prisms with a viewing apparatus of the sample holder configured to translate therebetween. Methods can include disposing the curved substrate in the sample holder, transmitting a first beam, translating the sample holder, and transmitting a second beam. Alternatively, apparatus include a light scattering-polarimetry sub-system configured to emit a first beam to impinge an end surface of coupling prism and detect at least a portion of the first beam impinging the first surface of the coupling prism. The apparatus includes an evanescent prism coupling spectroscopy sub-system configured to emit a second beam to impinge a first surface of the coupling system and detect at least a portion of the second beam impinging the second surface of the coupling prism.

The invention discloses an infrared polarization detector and device, and relates to the photoelectric detection technology. The detector chip (2) is electrically connected with the reading circuit (1) through an indium column (5), a polarization grating (4) is arranged on one surface, far away from the reading circuit (1), of the detector chip, and a pixel array structure (3) is arranged on the other surface, close to the reading circuit (1), of the detector chip; the relative positions of the pixel array structures (3) and the polarization gratings (4) are in one-to-one correspondence. Through the design of the n-type region of the polarization grating structure, the crosstalk of adjacent pixel signals can be blocked, so that the response value when the light transmission axes of the polarizer and the polarization grating are vertical is reduced, and the extinction ratio of the infrared polarization detector is improved.

A polarization camera that includes a pixelated waveplate positioned to receive light. The pixelated waveplate includes an array of super-pixels comprising birefringent structures. Each super-pixel comprises a first at least one sub-pixel comprising a quarter-wave plate and a second at least one sub-pixel comprising a half-wave plate. A non-pixelated polarizer receives light from the pixelated waveplate. A detector detects light received from the polarizer.

A dispersion-based non-local polarization and spectral high-dimensional photoelectric detector. Incident light is modulated by a spatial light modulation module and then irradiates a non-local dispersion device (5) in the form of a specific spatial light field. Because of different polarization states and spectrums of the light in the spatial light field, the spatial light field that has passed through an angular channel generation component (4) irradiating the non-local dispersion device (5) will generate a corresponding transmitted intensity distribution; a light receiving module (6) images the transmitted intensity distribution; an information analysis module (7) analyzes the transmitted intensity distribution, and outputs high-dimensional intensity, polarization and spectral information of the incident light. The present application can detect with high precision high-dimensional light information of which the polarization state and the intensity vary with wavelengths, and acquire accurate intensity, polarization and spectral information only by a single measurement of a single detector, breaks through the detection dimension of conventional methods, reduces the complexity and measurement time costs of existing polarization and spectral imaging systems, and is significant for miniaturization and lightweightness of the polarization and spectral imaging systems.

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.

A device for generating linearly polarized light having different azimuth angles, and a laser beam machining method. The device comprises: a laser, a half wave plate, an electro-optical modulator, a reflection system and a quarter wave plate, wherein the quarter wave plate is used for adjusting light to linearly polarized light of which the polarization direction has an included angle of 45 degrees relative to a horizontal plane; the electro-optical modulator is used for adjusting the linearly polarized light output by the half wave plate, such that a polarization state of emergent light of the electro-optical modulator always lies on a meridian of a Poincaré sphere, thereby outputting Poincaré meridian polarized light; the reflection system is used for reflecting the Poincaré meridian polarized light to the quarter wave plate; and the quarter wave plate is used for adjusting the reflected light, such that the polarization state of emergent light of the quarter wave plate always lies on the equator of the Poincaré sphere, thereby outputting the linearly polarized light having different azimuth angles. The problem that the laser beam machining effects are affected by change in polarization state caused by reflectors in existing linearly polarized light generating devices is solved.