81 results about "Polarimetry" patented technology

The invention relates to the technical field of grating interferometry, in particular to a Littrow grating interferometry device and a use thereof. The device comprises: a two-frequency orthogonal polarization light source, a polarizing beam splitting prism, a reflection assembly, a detector, and a first diffraction grating and a second diffraction grating having identical parameters. The output light of the two-frequency orthogonal polarization light source is split by the polarizing beam splitting prism into horizontally polarizing measuring light which is transmitted and vertically polarizing measuring light which is reflected. The two beams of measuring light undergo diffraction twice between the first diffraction grating and the second diffraction grating, and finally the two beams of measuring light interfere with each other and are incident on the detector. Grating displacement is calculated according to the interference pattern. The invention achieves secondary diffraction under Littrow incidence, and improves the precision of displacement measurement.

The invention discloses a confocal full-Mueller matrix imaging device and method based on an optical fiber metasurface array, and belongs to the technical field of polarized optical imaging. The device comprises an optical fiber array multi-polarization illumination module, a sample scanning module, a scattered light transmission module, a metasurface array polarization modulation module and a polarized light intensity detection module. The polarization states of four beams of light are regulated and controlled through the optical fiber polarization controller, and four illumination focal spots in different polarization states are generated on a sample plane at the same time; sample scattered light is modulated by a polarization measurement metasurface array comprising four independent metasurface units, and the polarization state of each path of optical signals is projected to sixteen polarized light spots which are spatially separated; and finally, acquiring light spot intensity information by an area array detector, and reconstructing a full-Mueller matrix image of the sample through calculation. According to the invention, full-Mueller matrix information can be obtained through single scanning, and the device has the characteristics of high resolution, compact structure, good compatibility and the like, and can be used for multi-dimensional polarization microscopic analysis of samples.

Polarization BRDF characteristic measuring device and method, belong to optical measurement technical field, the present application is to solve the existing BRDF or polarization BRDF measurement slow, low efficiency problem of measurement.The scheme of the present application: the laser light source at the second focal point emits laser light vertically through the circularly polarized light generating system and the polarizing system, the circularly polarized light generating system converts the laser light emitted by the laser light source into circularly polarized light, the polarizing system quantitatively changes the polarization state of the circularly polarized light to form the measuring incident light, the incident light is transmitted through the transmission light of the half mirror, and is reflected by the ellipsoidal mirror to the surface of the sample to be measured at the first focal point, the reflected light wave of the surface of the sample to be measured is reflected again by the inner surface of the ellipsoidal mirror, and is transmitted to the second focal point direction and is reflected by the half mirror, and the reflected light wave is converged to the third focal point of the measuring system through the polarizing system, the polarizing system is adjusted with the polarizing system, and the polarization BRDF characteristic of the sample to be measured is measured.

The invention discloses a non-contact polarization image measuring device and method for a large-size PBX curing process. The non-contact polarization image measuring device comprises a three-dimensional sample table, a diaphragm, a zoom lens, a micro-polarization array and a detector which are arranged along a light path direction, a sample to be tested is placed on the three-dimensional sample table, and the center of the sample to be tested coincides with the center of the three-dimensional sample table; the diaphragm realizes normalization processing of emergent light energy by regulating and controlling the intensity of reflected light on the surface of the sample; the zoom lens collects normalized emergent light to the surface of the micro-polarization array, and is adjusted and matched with the z-axis of the three-dimensional sample table to realize scanning imaging of a to-be-detected sample in the depth direction; the detector acquires a linear polarization image. According to the method, the PBX is measured through non-contact polarization, high-precision characterization analysis of the PBX curing process is completed by calculating key parameter (polarization angle and polarization degree) changes caused by curing, and the problems of pollution, large error and high danger of a sample in traditional contact measurement are solved.

The invention discloses a colon adenoma identification method and device based on Mueller matrix polarization measurement and regularization, a storage medium and electronic equipment. The method comprises the following steps: acquiring a polarization image corresponding to a fresh medical sample containing colon adenoma and normal tissue through a light polarization system, and preprocessing the polarization image; fourier analysis is carried out on a detection signal in the light polarization system to obtain a Mueller matrix, and a Lu-Chipman polarization decomposition algorithm is used for carrying out polarization decomposition on the Mueller matrix to obtain three polarization decomposition parameters; obtaining polarization data of a plurality of channels based on the Mueller matrix, and constructing a sample set based on the polarization data; constructing a target function based on the projection function and the sample set, solving the target function to obtain an analytic solution of the optimal projection direction, and calculating a characteristic value based on the analytic solution of the optimal projection direction; and classifying the polarization images corresponding to the fresh medical samples of the colon adenoma and the normal tissue based on the feature values to obtain a classification result. The lesion recognition rate can be improved.

The invention relates to the field of optics, and provides a device and a method for measuring an angle resolution polarization Raman spectrum. The angle resolution polarization Raman spectrum measuring device comprises a connecting mounting plate which is used for mounting the measuring device in a light path of a Raman spectrometer; the rotary mounting seat is fixed on the connecting mounting plate; the angle rotary table is arranged in the rotary mounting seat and is driven by the driving part to rotate; and the wave plate is mounted on the angle turntable and is used for changing the polarization directions of the incident laser and the Raman signal light through the wave plate. The angle resolution polarization Raman spectrum measuring device solves the problem of rotation and displacement of tiny samples, ensures in-situ and continuous measurement of small-size samples such as two-dimensional materials and nanoparticles, and compared with a traditional manual rotation wave plate mode, the angle setting error is reduced, the laser polarization direction is ensured to be adjusted according to preset precision, and the measurement accuracy is improved. And the high-resolution polarization measurement requirement is met.

The invention discloses a space target pBRDF model construction method based on an improved SBA algorithm, and relates to the technical field of space target polarization measurement and modeling, and the method comprises the steps: preliminarily building a pBRDF model of a target material corresponding to a to-be-measured sample according to a pBRDF theory, a light elastic scattering theory and a blackbody radiation theory; the method comprises the following steps of: representing the actually measured # imgabs0 # value of a to-be-measured sample at each angle in a simulated atmospheric environment by acquiring a polarization characteristic measurement result of the to-be-measured sample; an improved SBA algorithm is adopted to perform parameter inversion according to the measured # imgabs 1 # value; and substituting a parameter inversion result into the pBRDF model to calculate an error between a simulation value and a measured value of the model, and selecting whether to output the pBRDF model or not according to error precision to obtain a final pBRDF model. According to the invention, the accuracy of polarization detection of the space target can be improved.

The invention relates to a method for determining at least one item of environmental information (22) relating to a property of at least one object (6) located in the surroundings (4) of a motor vehicle (1) and / or at least one surface (7) located in the surroundings (4), wherein polarised laser light (3) is generated by means of at least one lidar device (2) of the motor vehicle (1) and emitted into the surroundings (4), wherein the environmental information (22) is determined based on the polarised laser light (3) and backscattered laser light (8), wherein the backscattered laser light (8) is a portion of the polarised laser light (3) that is scattered back from the object (6) and / or the surface (7) to the lidar device (2), wherein, in order to determine the environmental information (22), a polarimetric, coherent phase evaluation is performed in which at least one item of phase information (14) is determined which relates to a phase shift between the polarised laser light (3) and the backscattered laser light (8), wherein the environmental information (22) is determined based on the phase information (14).

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.

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

This application discloses a method and related apparatus for obtaining a phase retardation map and a fast axis orientation map of the cornea. The method includes inputting a preset polarization state into a metasurface polarization analyzer to obtain polarization measurement data output by the metasurface polarization analyzer; solving for polarization state matrix parameters based on the polarization measurement data; and decomposing the polarization state matrix parameters to obtain a phase retardation map and a fast axis orientation map of the cornea. Using this application embodiment, subtle microstructural changes in the cornea can be captured with high sensitivity, compensating for the lack of quantitative analysis methods in traditional slit-lamp examinations, while effectively overcoming the problem of insufficient accessibility caused by the large size and high cost of traditional high-end detection equipment.

The present invention discloses a fast composite polarization system and method capable of real-time self-calibration, which includes a PSA composed of 2 liquid crystal variable phase retarders and 1 polarizer, a PSG composed of 1 turntable, a quarter achromatic waveplate and 1 polarizer, a collimating lens, a condenser lens, a light source and a detector. Two detection windows are provided at the sample to be measured in the system. One window is for placing the sample to be measured, and the other window is for air. The light beam emitted by the light source is collimated by the collimating lens, and the collimated light beam enters the PSG. The light beam generates various set polarized lights through the PSG. The polarized light enters the detection window. Part of the light passes through the window of the sample to be measured, carrying the polarization information of the sample to be measured, and the other part passes through the air window. Then the two light beams are analyzed by the PSA and finally detected by the detector through the condenser lens. The present invention can accelerate the polarization measurement speed and achieve automatic system calibration after each measurement, realizing fast and high-precision polarization detection.

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.

The disclosure provides an electro-optic phase modulator for a displacement measurement system and the displacement measurement system. The electro-optic phase modulator comprises a housing with an accommodation space, an entrance and an exit are formed on the housing, and polarized measurement light enters the accommodation space through the entrance; a modulation crystal is arranged in the accommodation space and is configured to modulate the polarized measurement light from the entrance, and a polarization direction of the polarized measurement light is 45° to a modulation electric field direction of the modulation crystal; and a quarter-wave plate is located between the modulation crystal and the exit, an optical axis of the quarter-wave plate is 45° to the modulation electric field direction of the modulation crystal, the polarized measurement light passes through the quarter-wave plate and is emitted to a measured object through the exit, the measured object reflects the polarized measurement light back to the modulation crystal through the quarter-wave plate, and a polarization component direction of the polarized measurement light reflected back to the modulation crystal is changed by 90° compared with that of the polarized measurement light emitted to the modulation crystal through the entrance.

The invention relates to a polarization detection optical system polarization measurement error decoupling method and a design index decomposition method, belongs to the technical field, and solves the polarization measurement error theoretical decoupling of a polarization optical system and an imaging optical system in a polarization detection optical system in the optical polarization detection field. The invention relates to a technical problem of design index decomposition of a polarization optical system and an imaging optical system with system polarization measurement precision as a constraint. The polarization measurement error decoupling method comprises the steps of determining a polarization modulation scheme of the polarization detection optical system, determining parameters of the polarization detection optical system, establishing a polarization detection optical system model, analyzing errors of the polarization optical system, analyzing errors of the imaging optical system and analyzing errors of the polarization detection optical system. And decoupling the polarization measurement error of the polarization detection optical system. The design index decomposition method comprises a polarization measurement error decoupling method step and a design index decomposition step. The method is used for polarization detection precision analysis of the polarization detection optical system.

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.

A kind of microplastic rapid detection device and method based on backward polarization imaging, comprising: polarization state generator, generating polarized light irradiation microplastic in water body;Polarization state receiver, receive the polarization information of backscattering polarized light, obtain the polarization image containing polarization parameter;Polarization image detection and identification device, split the polarization image into multiple polarization pixel points, each polarization pixel point corresponds a one-dimensional vector containing multiple elements, each element value in one-dimensional vector represents the polarization value of corresponding polarization pixel point under multiple different polarization states, so as to capture the complete polarization characteristics of each polarization pixel point;Through one-dimensional data classification model 1D-ResNet, each polarization pixel point is classified, and the classification label of each polarization pixel point is obtained;The classification result is mapped back to image space, to realize the rapid detection and visual identification of microplastic in water body.The present application can detect microplastic particles in water body more quickly and accurately compared with existing detection techniques.

The invention discloses a polarization optical detection system polarization measurement error calibration method based on deep learning, and solves the problem that polarization measurement errors introduced by polarization detection optical system instrument polarization and optical system imaging quality cannot be calibrated at the same time in the prior art. Comprising the following steps: 1, obtaining a modulation matrix of a polarization optical detection system to be calibrated; 2, acquiring a clean intensity image matrix and a degraded intensity image matrix; 3, constructing a polarization image restoration network; 4, training a polarization image restoration network; 5, acquiring an actual degradation intensity image matrix; 6, inputting the actual degradation intensity image matrix into the polarization image restoration network to obtain a predicted clean intensity image matrix; 7, calculating a polarization measurement error; 8, obtaining an instrument polarization characteristic measurement error; and 9, calculating the polarization measurement error of the polarization optical detection system to be calibrated according to the polarization measurement error and the instrument polarization characteristic measurement error, and completing calibration.

The application discloses a confocal full Mueller matrix imaging device and method based on a fiber super surface array, and belongs to the technical field of polarized optical imaging. The device comprises a fiber array multi-polarization illumination module, a sample scanning module, a scattered light transmission module, a super surface array polarization modulation module and a polarized light intensity detection module. The polarization state of four beams of light is regulated by a fiber polarization controller, and four illumination focal spots with different polarization states are generated simultaneously on a sample plane. The sample scattered light is modulated by a polarization measurement super surface array comprising four independent super surface units, and the polarization state of each light signal is projected onto sixteen spatially separated polarized light spots. Finally, the light spot intensity information is collected by a surface array detector, and the full Mueller matrix image of the sample is reconstructed by calculation. The application realizes the acquisition of full Mueller matrix information in a single scan, has the characteristics of high resolution, compact structure and good compatibility, and can be used for multi-dimensional polarization microscopic analysis of samples.

The present invention relates to a polarimetric (PT) measurement device for anisotropic quantities of a medium (M), comprising a spectrally structured light source (SSS) delivering a series of pulses with reference spectral grooves, spectral polarization coding means (MPG) configured to spectrally polarize each of the reference pulses delivered by the light source with a measurement phase delay identical to the reference phase delay, a light detector (D) configured to capture the light intensity reflected by the medium (M) for each of the reference pulses delivered by the light source, and a measurement unit configured to determine the anisotropic quantities of the medium (M) from the images captured by the detector. Figure 3

The present invention relates to a polarimetric (PT) measurement device for anisotropic quantities of a medium (M), comprising a spectrally structured light source (SSS) delivering a series of pulses with reference spectral grooves, spectral polarization coding means (MPG) configured to spectrally polarize each of the reference pulses delivered by the light source with a measurement phase delay identical to the reference phase delay, a light detector (D) configured to capture the light intensity reflected by the medium (M) for each of the reference pulses delivered by the light source, and a measurement unit configured to determine the anisotropic quantities of the medium (M) from the images captured by the detector. Figure 3

This application discloses an optical apparatus for quantum computing, a system, a method and a storage medium. The apparatus includes: a delay generation module configured to generate different time delays for n photons respectively; an optical fiber collimation module configured to convert light rays of the n photons into n collimated light rays to propagate; a quasi-spatial mode generation module configured to enable the light rays of the n photons to pass through the same active optical element in sequence, the active optical element being configured to modulate the optical signals of the n photons in sequence according to the time sequence in which the n photons arrive; and a feedforward measurement module configured to perform polarimetry on a modulated optical signal of a first photon to obtain a measurement result for performing feedforward compensation or feedforward error correction on a measurement result of a second photon to be measured.

The invention relates to an optical polarization measurement precision model analysis and construction method of an amplitude-division polarization camera, and relates to the technical field of optical polarization measurement of the amplitude-division polarization camera, and the method comprises the steps: analyzing a multi-channel light path structure of the amplitude-division polarization camera; constructing a polarization measurement model of the linear polarizer extinction ratio; constructing a polarization measurement model of the transmission axis angle of the linear polarizer; constructing a polarization measurement model of the prism splitting ratio; and constructing a polarization measurement model of the prism azimuth angle. According to the method, an error source influencing the polarization measurement precision of the amplitude-division polarization camera is fully analyzed, the influence of incident angle spatial distribution on the splitting ratio of s light to p light of the beam splitter prism is introduced, a more accurate polarization measurement precision model of the amplitude-division polarization camera is constructed, guidance is provided for an actual calibration experiment, and the simulation and implementation stability is enhanced; through polarization measurement model modeling and coupling of each channel light path component, complete coupling and polarization measurement information transmission are realized, and the optical polarization measurement precision is improved.

Methods, devices and systems for estimating polarization characteristics of materials based on partial polarimetry are described. One example method for estimating polarization characteristics of a material includes illuminating the material with incident light, which can be unpolarized or have a particular polarization state. Two polarimetric measurements are conducted based on the interaction of the incident light with the material. The two polarimetric measurements detect light having orthogonal polarization states, and the interaction of the incident light with the material includes a depolarizing interaction. The method additionally includes determining an estimated coherency matrix eigenvalue and an estimated Mueller matrix throughput parameter using the first and the second polarimetric measurements, and determining an estimate of a full depolarizing Mueller matrix by extrapolating a reduced-rank Mueller matrix to obtain all sixteen elements of the depolarizing Mueller matrix that identifies the polarization characteristics of the material.

The present application relates to a kind of polarization measurement error evaluation and decoupling system, evaluation method and decoupling method, in particular to a kind of polarization measurement error evaluation and decoupling system, evaluation method and decoupling method of polarization detection optical equipment, solve the problem that prior art lacks the evaluation method and decoupling method of coupled polarization measurement error introduced by instrument polarization and imaging quality of polarization detection optical equipment.The system includes test beam generation module, analysis unit and information acquisition computer;Test beam generation module includes laser light source, beam collimator, polarizer, beam splitter and the polarization distribution modulation element of light arranged on the reflected light path of beam splitter in order along optical path;Analysis unit is arranged on the output light path of the polarization detection optical equipment to be measured, for acquiring the detection signal outputted therefrom, and extract the required information therefrom, and transmit to information acquisition computer;Information acquisition computer is used to calculate polarization measurement error and decouple coupled polarization measurement error.

The invention discloses a fiber grating demodulation system and demodulation method based on a polarization measurement technology, and a corresponding grating weighing sensor, and belongs to the technical field of optical fiber sensing. The system comprises a broadband light source, a circulator, a grating weighing sensor, a polarizer, an optical fiber delayer, a polarization beam splitter, a first photoelectric detector, a second photoelectric detector, a data acquisition card and a demodulation module. According to the method, reflected light of the sensor is changed into linearly polarized light through the polarizer, the linearly polarized light is delayed and then divided into two paths of orthogonal components through the polarization beam splitter, the two paths of orthogonal components are converted into voltage signals, the demodulation module processes the two paths of signals through a differential balance algorithm, a phase delay angle related to wavelength change is extracted, and then the weight is calculated. The invention further provides a grating weighing sensor adopting the left-handed and right-handed fixing bolt and reinforcing bolt structure, and the grating weighing sensor is used for applying and keeping constant pretension force. According to the method, the problems of low precision and poor anti-interference performance of a traditional demodulation method are solved, and the accuracy and the stability of fiber grating weighing measurement are remarkably improved.

The invention relates to the technical field of radars, in particular to a Mueller matrix laser radar which comprises an optical chip integrated with a pulse light modulator, a polarization state generator and a polarization measuring instrument. The optical circulator is provided with a first port, a second port and a third port, the first port is connected with the output end of the polarization state generator, and the third port is connected with the input end of the polarization measuring instrument; and a circuit control system 200. The pulse light is adjusted by the polarization state generator, then is input to the optical circulator from the first port and is output to a target object from the second port, return light interacting with the target object is input to the optical circulator from the second port and is output to the polarization measurement instrument from the third port, and the polarization measurement instrument measures the polarization state of the return light and outputs measurement data. The circuit control system constructs a Mueller matrix of the target object according to the polarization state of the emitted light and the polarization state of the returned light, and realizes distance measurement and component analysis of the target object by analyzing the Mueller matrix and comparing time delay of optical signals.

A polarization measuring device is operated by passing light having a predetermined input polarization state to a sample for a potentially polarization changing interaction and from the sample through a polarization selective analyzer and to an intensity detector. The method proceeds by varying an angle between the output polarization state of the light emanating from the sample and the analyzer. The wavelength of the light reaching the intensity detector is varied, and a plurality of intensity measurements are performed successively at different constellations of polarization. Spectral modulation states and corresponding intensity values are stored together with polarization and spectral values representing the corresponding constellation. The polarization modulation and the spectral modulation are performed simultaneously and continuously, and during a single, monotonic variation of the polarization modulation state, the spectral modulation state is varied plural times and during each spectral modulation period (τλ) plural successive intensity measurements are performed.

This invention belongs to the field of ultrafast spectroscopy technology, specifically relating to a system and method for parallel measurement of transient absorption spectroscopy and magneto-optical polarization. The system comprises: a femtosecond laser, a first beam splitter, a pump pulse adjustment component, a probe pulse adjustment component, a second beam splitter, a beam combiner, a focusing and imaging device, a third beam splitter, a spectral measurement device, and a polarization measurement device. This system can simultaneously measure transient absorption spectroscopy and magneto-optical polarization.