83results about "Polarisation spectroscopy" patented technology

The invention discloses a polarization spectrum modulation type multispectral stereo imaging method which solves the problem that in the prior art, an existing polarization spectrum imaging scheme does not achieve three-dimensional reconstruction of a target and achieves the purpose that the three-dimensional reconstruction of the target is not achieved under the condition that active illumination or special marks are not needed. Synchronous high-precision reconstruction of physical attributes and three-dimensional geometry of the surface of the target is realized; the method comprises the following steps: uniformly modulating polarization information and spectral information of incident light of a target through a three-way optical filter and a polaroid to obtain modulated incident light information; performing aliasing acquisition of a plurality of polarization spectrum components on the modulated incident light information through a multi-color detector combination to obtain aliasing light intensity; performing linear solution on the aliasing light intensity to obtain each polarization spectrum component vector, calculating the polarization degree and the polarization angle of each channel, and further deriving a surface zenith angle and an azimuth angle; reconstructing the three-dimensional morphology of each spectrum channel through normal gradient field frequency domain integration; and finally, fusing the multi-spectral three-dimensional data to obtain a multi-spectral three-dimensional imaging result.

The invention discloses a calibration method of a polarization focal plane imaging system and an imaging system, relates to the field of photoelectric imaging and remote sensing detection imaging, and solves the problems of low correction efficiency and difficulty in correcting a system with a changed polarization state in the conventional polarization error correction technology. According to the calibration method, a plurality of coding patterns and corresponding polarization modulation matrixes are obtained based on the collected uniform light field and serve as calibration results. The polarization error correction method comprises the steps of obtaining an observation intensity vector based on a target scene; a corresponding polarization modulation matrix is obtained based on the coding pattern according to a coding polarization modulation matrix lookup table, and then a down-sampling Stokes vector after polarization error correction is obtained; and completing the correction of the polarization error through an imaging reconstruction method. A polarization focal plane imaging system comprises an imaging lens, a DMD digital micromirror array coding module, a focal plane DoFP polarization detector and an imaging reconstruction module. The method is suitable for the fields of remote sensing detection, target identification, environment monitoring and the like.

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.

This invention relates to the field of optical imaging and detection technology, specifically providing a broadband snapshot-type polarization interferometry imaging detection system and method for breast tumors. A broadband light source illuminates a breast tumor tissue sample. The reflected signal light is collected and collimated by a pre-optical system, then sequentially passes through a first and a second ray shaping unit for two shearing and two polarization state transformations, resulting in two beams of linearly polarized light and two beams of circularly polarized light. These beams are imaged by an imaging lens to an area array detector to obtain a polarization interferogram, which is then demodulated to obtain all Stokes parameters of the breast tumor tissue sample. This invention achieves broadband snapshot imaging of breast tumors with all Stokes parameters without using an analyzer, doubling the light throughput compared to traditional polarization imaging instruments using analyzers. Furthermore, this invention has advantages such as compact structure, no moving parts, easy assembly and adjustment, and no need for image registration.

An optical measuring device having a polarization state generator to prepare a measuring light having a defined polarization state propagating along an analysis beam path, a receiving equipment arranged downstream of the polarization state generator to receive at least a first measuring cell and a second measuring cell, a polarization state analyzer arranged downstream of the receiving equipment, a detector for detecting an intensity of the measuring light, a stationary transmitting / receiving system to communicate with at least one of the first measuring cell and the second measuring cell and an evaluation and control unit for evaluating measuring signals from the detector and / or the polarization state analyzer and / or the polarization state generator taking into account information communicated between the stationary transmitting / receiving system and at least one of the two measuring cells.

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 present disclosure provides a contact-less detection using a cross-cavity device where a small dielectric sample is placed at its center. The optical properties of the sample, such as the Kerr and Faraday rotation, or polarizability, manifest in the coupling between the cavities' electromagnetic modes and in the shift of their resonant frequencies. By calculating the dynamics of what are referred to herein as geometrical photonic states, a measuring protocol is formulated based on the quantum metric that maximizes the Fisher information and isolates the individual components of the complex dielectric function.

This invention relates to a dual-mode singularity sensing system based on phase jump, comprising a sensing module composed of alternating layers of hyperbolic metamaterials and isotropic first dielectric layers. The sensing module exhibits a continuous-domain bound-state phenomenon when incident light propagates, and this continuous-domain bound-state phenomenon includes the ability to split into a pair of reflecting phase singularities with opposite topological charges. This invention extends singularity sensing technology from single-mode to dual-mode, enabling independent two-step measurements and exhibiting higher robustness to environmental perturbations.

The application discloses a kind of full polarization spectral imaging device and detection method, contain sequentially arranged polarization modulator, imaging spectrometer, data acquisition processing display system to incident light;Polarization modulator is single fixed retarder and single fixed linear polarizer sequentially arranged along incident light, can carry out spectral modulation to full stokes parameter, it has the superiority of simple, ultra-compact, miniaturization, anti-system error in structure.By constructing complete imaging physical model or constructing imaging physical model based on compressed sensing, then using untrained artificial neural network realizes the full stokes parameter image reconstruction under each narrow waveband, and the deep neural network of "black box operation" is endowed with physical meaning.The reconstructed polarization spectral resolution can be consistent with the resolution of the imaging spectrometer used;And it has the characteristics of strong anti-noise ability, so as to ensure high-quality reconstruction.

The invention belongs to the field of polarization measurement, and particularly relates to a space solar spectrum magnetic field telescope based on multi-wave-plate polarization modulation, which comprises a telescope system, a relay system and a spectrum imaging system, the telescopic system comprises a first 1 / 2 wave plate, a 1 / 4 wave plate and a second 1 / 2 wave plate; when neither the first 1 / 2 wave plate nor the second 1 / 2 wave plate fails, the second wave plate is kept static, and the first wave plate and the third wave plate rotate in the same direction according to a preset different-speed asynchronous motion time sequence, so that the full-stokes component of the solar polarization spectrum is measured; when any one of the first 1 / 2 wave plate and the second 1 / 2 wave plate breaks down, the 1 / 4 wave plate is started, and the 1 / 4 wave plate and the other normally working 1 / 2 wave plate rotate in the same direction according to the re-planned different-speed asynchronous motion time sequence, so that the measurement of the full stokes component of the solar polarization spectrum is maintained. According to the invention, full Stokes measurement can be realized, and the blank of space solar vector magnetic field detection capability in China is filled.

This application relates to the field of optical polarization measurement technology, specifically to a wide-spectrum, high-bandwidth static spectral modulation Stokes polarization measurement device, comprising a polarization modulation module, a spectral sampling module, and a high extinction ratio polarizer. The polarization modulation module includes a phase retarder and a linear polarizer; the spectral sampling module has sub-nanometer spectral resolution; the high extinction ratio polarizer includes a halogen tungsten lamp and a Glan Taylor prism for generating high-purity linearly polarized light; the obtained demodulation factor and the modulation spectrum acquired by the spectral sampling module are used to invert the Stokes parameters using zero-heterodyne coherent demodulation technology. This application employs a phase retarder with high birefringence, which, for the same thickness, produces an optical path difference tens of times greater than that of quartz, increasing the Stokes polarization measurement bandwidth by a factor of the response and improving the measurement accuracy of polarization spectral parameters. Simultaneously, the zero-heterodyne coherent demodulation method is used to eliminate the dispersion interference of the phase retarder through calibration.

The invention discloses a circular polarization spectrometer and a spectrum analysis method thereof, and relates to the technical field of circular polarization spectrum analysis. A chiral structure layer of a circularly polarized photoelectric detector of the circular polarization spectrometer comprises a left-handed chiral structure array and a right-handed chiral structure array which are independent from each other and are in mirror symmetry, and a photosensitive layer comprises a first photosensitive unit and a second photosensitive unit. The first photosensitive unit is electrically connected with the first signal detection module through the first electrode group, the second photosensitive unit is electrically connected with the second signal detection module through the second electrode group, and the circularly polarized photoelectric detector is used for collecting a left-handed response current signal and a right-handed response current signal under monochromatic light with the same wavelength; and the circular polarization spectrometer calculates the left-hand circularly polarized light intensity and the right-hand circularly polarized light intensity according to a formula. The circular polarization spectrometer can synchronously and quantitatively separate left-handed and right-handed circularly polarized light on a monochromatic wavelength point, and the device stability and the process compatibility are high.

The invention belongs to the technical field of remote sensing, and relates to an atmospheric calibration instrument data processing method using active and passive cooperative remote sensing, which comprises the following steps: S1, carrying a synchronous atmospheric calibration instrument integrating a multispectral polarization camera and a multi-beam laser radar on the same satellite with a high-resolution imaging load to realize complete coverage of an observation area and time-space synchronous observation, acquiring multispectral polarization data and laser radar data; s2, on the basis of laser radar data, atmospheric vertical profile parameters are inverted through a parameter inversion method; s3, based on the multispectral polarization data, combining with a ground surface polarization reflectivity model to invert aerosol related parameters; s4, performing space-time matching and uniformity judgment on the laser radar data and the multispectral polarization data, and screening effective synchronous observation points; s5, collaborative inversion and iterative optimization are carried out based on the active and passive data of the synchronous observation points, and geogas three-dimensional space-time distribution parameters are obtained; and S6, performing atmospheric correction on the remote sensing data of the high-resolution imaging load.

The application provides a multi-dimensional information measuring system and method of a light field. The multi-dimensional information measuring system of the light field comprises a regulating device, which is used for adjusting an illumination state of a light field to obtain an initial light field; a scene simulation device, which comprises a simulation medium and a target object, receives the initial light field, and makes the initial light field pass through the target object and the simulation medium and exit to obtain a to-be-measured light field; and a multi-dimensional detection device, which receives the to-be-measured light field and detects information of the to-be-measured light field. The scene simulation device simulates multiple scenes, and the system can detect multi-dimensional light field information of multiple environmental variables.

The spectrometer includes: a light source unit emitting a laser beam; a mirror unit including a first plane mirror having a first mirror surface and a second plane mirror having a second mirror surface, wherein a measurement target is introduced between the first mirror surface and the second mirror surface; and a light detector detecting the laser beam returned by multiple reflection between the first mirror surface and the second mirror surface. The first mirror surface and the second mirror surface are arranged non-parallel to each other when viewed from the Z-axis direction so as to form an optical path of the laser beam reciprocating in the Y-axis direction while performing multiple reflection between the first mirror surface and the second mirror surface. The optical path of the laser beam between the first mirror surface and the second mirror surface is inclined with respect to the Z-axis direction.

Disclosed herein is a pulse splitter, spectrometers comprising the pulse splitter, and methods of using the same. Suitably, the pulse splitter may be used to prepare an interferometer. The pulse splitter utilizes an adjustable wedge module that includes a receiving wedge element, central wedge element, and collineating wedge element. Each of these elements are made of the same birefringement material and at least one of these elements is movable and configured to modulate the time separation between the first polarized radiation and the second polarized radiation.

An optical spectrum obtaining apparatus includes: a beam splitting unit, a first / second optical spectrum computation unit, and a processing unit. The beam splitting unit is configured to: receive a light beam from a light source, split the light beam into a first polarization component and a second polarization component with different polarization directions, transmit the first polarization component to the first optical spectrum computation unit, and transmit the second polarization component to the second optical spectrum computation unit. The first optical spectrum computation unit is configured to compute an optical spectrum of the first polarization component. The second optical spectrum computation unit is configured to compute an optical spectrum of the second polarization component. The processing unit is configured to obtain an optical spectrum of the light beam based on the optical spectrum of the first polarization component and the optical spectrum of the second polarization component.

The application belongs to the technical field of precision optical instruments, and specifically discloses a general calibration method for system parameters of an ellipsometer not based on a model, which comprises the following steps: selecting standard samples of multiple categories as reference samples, placing the reference samples in an ellipsometer for polarization experiments, and collecting light intensity signals corresponding to the reference samples; obtaining light intensity matrices or light intensity coefficient matrices corresponding to the reference samples according to the light intensity signals of the reference samples; solving an analysis matrix describing an analyzing arm of the ellipsometer system and a modulation matrix describing a modulating arm of the ellipsometer system through multi-parameter joint optimization, and simultaneously obtaining characteristic parameters of the reference samples by using a nonlinear regression optimization method; applying the calibrated analysis matrix and the modulation matrix to a to-be-tested sample, and calculating based on a light intensity matrix or a light intensity coefficient matrix of the to-be-tested sample to solve optical parameters of the to-be-tested sample. The application can realize the generality and simplicity of the ellipsometer calibration process.

The application discloses a design method and system of a polarization detection metasurface. The method comprises the following steps: establishing a microstructure model, scanning the phase delay of microstructures with different geometric sizes under x and y polarizations; specifying two groups of orthogonal polarization states and target propagation angles, calculating the supercell size and the number of microstructures contained therein, and confirming the polarization beam splitting target required under the two groups of orthogonal polarization states; calculating the Jones matrix of each microstructure in the supercell and selecting a group of microstructure parameters as the initial solution; establishing a supercell model according to the initial solution and performing forward propagation simulation to obtain the diffraction order intensity distribution under the two groups of orthogonal polarizations, and constructing a loss function to obtain the optimal supercell structure meeting the polarization beam splitting target after iterative optimization; and performing two-dimensional periodic expansion on the supercell structure to obtain a metasurface structure. The application can realize efficient separation of multiple polarization states on a single metasurface, avoids the crosstalk problem in the traditional space division multiplexing mode, and improves the spatial resolution.

In at least one example of the present disclosure, a device can include a sample stage configured to hold a sample, pulsed laser source configured to produce a pulsed light in the mid-infrared (IR) region, and a polarizer configured to receive the pulsed light. The device can further include a plurality of optical components, an active multiplexing device (AMD), a detector configured to receive the pulsed light, and a data processing unit configured to generate an image.

Apparatus and methods are presented for spectral domain optical imaging, in particular for single shot 3-D spectral domain imaging of the retina of the human eye. In certain embodiments one or more 3-D images across elongated areas of an object are acquired, with scanning perpendicular to the long axis of the elongated areas for imaging extended volumes of the object. In preferred embodiments the captured light is sampled in the Fourier plane, in a dimension substantially perpendicular to the long axis, with a cylindrical lenslet array, while in other embodiments the captured light is sampled in the image plane. Apparatus and methods are also presented for hyperspectral imaging of the retina, with the illuminating beams preferably angled to suppress interference from corneal reflections. Apparatus and methods are also presented for multi-wavelength wavefront sensing, with simultaneous capture of light in two or more paths with different delays.

Embodiments of the present application relate to a three-dimensional spatial light source system and a corresponding light measurement device, wherein the three-dimensional spatial light source system comprises: a light source; and a plurality of light paths independent of each other and configured to be coupled to the light source independently; wherein the plurality of light paths further comprises an intermediate light path and a plurality of peripheral light paths arranged around the intermediate light path and capable of being output as secondary light sources. Thus, the three-dimensional spatial light source system of the present application only needs one light source to meet the multi-path light source requirement of an elliptical polarization measurement device, and has simple structure, convenient installation and maintenance.

The invention discloses a design method and system of a polarization detection metasurface. The method comprises the following steps: establishing a microstructure model, and scanning phase delays of microstructures with different geometric dimensions under x and y polarization; specifying two groups of cross-polarization states and target propagation angles thereof, calculating the size of a super-unit cell and the number of microstructures contained in the super-unit cell, and confirming polarization beam splitting targets required in the two groups of cross-polarization states; calculating a Jones matrix of each microstructure in the supercell and selecting a group of microstructure parameters as an initial solution; establishing a super-cell model according to the initial solution and performing forward propagation simulation to obtain diffraction order intensity distribution under two groups of orthogonal polarization, and constructing a loss function to perform iterative optimization to obtain an optimal super-cell structure meeting a polarization beam splitting target; and carrying out two-dimensional periodic expansion on the super-unit cell structure to obtain the super-surface structure. According to the invention, efficient separation of multiple polarization states can be realized on a single metasurface, the crosstalk problem in a traditional space division multiplexing mode is avoided, and the spatial resolution is improved.

A system for infrared analysis over a wide field area of a sample is disclosed herein that relies on interference of non-diffractively separated beams of light containing image data corresponding to the sample, as well as a photothermal effect on the sample.

The invention discloses a quantum dot polarized photoelectric detector and a preparation method and application thereof, and relates to the technical field of photoelectric detection. The quantum dot polarized photoelectric detector comprises a substrate, a gold layer, an aluminum oxide layer, a patterned gold layer 1, a ZnO quantum dot layer and a patterned gold layer 2 which are sequentially arranged from bottom to top. According to the quantum dot polarization photoelectric detector, polarization detection of ultraviolet light can be achieved, polarization characteristics (polarization direction, polarization degree and polarization state distribution) of the ultraviolet light are captured, efficient detection of polarization state light of a specific wave band by the quantum dot polarization detector is achieved, and absorption of the light at 220-320 nm is enhanced.

The application discloses a polarization multiplexed spectral imaging system based on an acousto-optic tunable filter and belongs to the technical field of spectral imaging. The system comprises, which are connected in sequence, a convergent incidence module, a spectral modulation module, a diffracted light separation correction module and an imaging module; the convergent incidence module converges and incides light into the spectral modulation module to obtain diffracted light and transmitted light with orthogonal polarization states containing specific spectra; the diffracted light separation correction module spatially separates the diffracted light and the transmitted light and shields the transmitted light, and compensates chromatic aberration and corrects inconsistency caused by polarization of the two beams of diffracted light through two branch lenses which are independent in parameters; and the imaging module combines and images the two beams of corrected diffracted light on the same pixel of a photoelectric detector, thereby solving the problem of large energy loss of a traditional acousto-optic tunable filter spectral imaging system caused by a front polarizer and realizing high-light-flux spectral imaging.

The application relates to the technical field of optics, in particular to a low-crosstalk channel modulation interference polarization spectrum detection method and system, which comprises a half-field telescope module, a phase modulation module, an interference modulation module and a detection module; the half-field telescope module is used for collimating an input target light beam in a lower half field, the target light beam is parallelly transmitted to the phase modulation module according to a set range, a compound polarization beam splitter prism group in the phase modulation module performs a light splitting operation based on the target light beam output by the half-field telescope module, two parallel polarization lights are emitted, and independent phase modulation of the two lights is ensured; the interference modulation module is used for performing light splitting modulation according to the two polarization lights, ensuring that the two polarization light beams after modulation interfere and are transmitted to the detection module to be imaged. The system improves the detection precision of narrow-band polarization spectrum or polarization spectrum with obvious narrow-band wave peaks and narrow-band absorption peaks, and has strong polarization spectrum detection capability and wide application range.

The application relates to a calibration method of a polarization defocus plane imaging system and the imaging system, and relates to the fields of photoelectric imaging and remote sensing detection imaging. The application solves the problems of low correction efficiency and difficulty in correcting the system for polarization state changes in the existing polarization error correction technology. The calibration method is based on collected uniform light fields to obtain a plurality of encoding patterns and corresponding polarization modulation matrices as calibration results. The polarization error correction method is based on a target scene to obtain an observation intensity vector; based on the encoding pattern, a corresponding polarization modulation matrix is obtained according to an encoding polarization modulation matrix lookup table, and then a down-sampling Stokes vector after correction of the polarization error is obtained; and the correction of the polarization error is completed through an imaging reconstruction method. A polarization defocus plane imaging system comprises an imaging lens, a DMD (digital micro-mirror array) encoding module, a defocus plane DoFP polarization detector and an imaging reconstruction module. The application is suitable for the fields of remote sensing detection, target identification and environment monitoring.

The present application relates to a kind of diffraction polarization imaging systems, including two major modules of diffraction imaging system, focal plane detector, wherein the diffraction imaging system includes a diffraction primary mirror and a set of Schupmann achromatic structure.Target radiation light passes through front aperture and diffraction primary mirror, then after diffraction primary mirror Schupmann achromatic lens group is used to correct chromatic aberration of light emitted by diffraction primary mirror, and converging lens is used to converge into the focal plane polarization detector.Light can be detected by focal plane detector to 0 °, 45 °, 90 °, 135 ° polarization image, and polarization degree and polarization angle image can be solved by Stokes vector method.The above-mentioned diffraction polarization imaging system uses a diffraction primary mirror, a set of Schupmann achromatic structure and a focal plane detector, four different angle polarization images are obtained simultaneously by one-time exposure, the number of imaging system lenses is greatly reduced, and the cost and complexity of the system are reduced.

This invention discloses a broadband polarization feature detection system and method based on a polarization grating. The system includes: a polarization state generator for generating broadband polarized light to be measured; a polarization grating for splitting the broadband polarized light into left-handed and right-handed circularly polarized light, and causing dispersion in the horizontal direction; a lens for imaging the intensity pattern formed after beam splitting and dispersion; a CMOS camera for acquiring the imaged intensity pattern; and a terminal device for analyzing and processing the acquired intensity pattern to obtain the spectral intensity ratio of left-handed and right-handed circularly polarized light in the beam to be measured, and calculating the spectral ellipticity and spectral polarization direction of the beam to be measured. This invention features a simple and compact structure, good stability, and fast measurement speed.