72 results about "Polarized spectroscopy" patented technology

The invention relates to a polarization spectrum imaging device and a polarization spectrum reconstruction method, in particular to a miniature high-energy-efficiency diffraction polarization spectrum imaging device and a polarization spectrum reconstruction method thereof, and solves the technical problems that an existing polarization spectrum imaging device is low in energy utilization rate and regulation and control precision and large in size. According to the miniature high-energy-efficiency diffraction polarization spectrum imaging device provided by the invention, the diffraction spectrum lens module, the electronic control rheological lens module and the polarization module are directly and compactly integrated by utilizing the macro imaging module, so that the space coupling distance can be reduced, and the imaging quality can be effectively improved; the diffraction spectrum lens module realizes time-sharing spectrum regulation and control through the electronic control rheological lens module, and the polarization module performs area array space division polarization regulation and control, so that 0-degree, 45-degree, 90-degree and 135-degree polarization information under different spectrum channels can be directly obtained, the absorption effect of traditional light filtering on spectrums is avoided, the energy utilization rate is improved, and the energy consumption is reduced. And the number of polarization regions can be reduced, and the regulation and control precision is improved.

The invention discloses a lunar resource in-situ exploration-while-drilling device and method. The lunar resource in-situ exploration-while-drilling device is composed of a spiral drilling tool, an illumination light source module, a polarization spectrum detection module and a dual-channel spectrum measurement module. The drilling tool drill rod is of a hollow structure. Light emitted by the illumination light source module is collimated and depolarized to form unpolarized parallel light to irradiate lunar soil on the side wall of the drill hole, and the polarization spectrum measurement probe collects reflected light of the lunar soil; the reflected light is collimated by a front collimator objective of the probe and then sequentially passes through a spectrum modulation unit consisting of an achromatic 1 / 4 wave plate, a multi-stage wave plate, a beam splitter prism and two polaroids of which the light transmission directions are vertical to each other, and two orthogonal light beams are formed, so that polarization information of the reflected light is modulated in a spectrum dimension; demodulating the modulated spectrum to obtain the spectrum and polarization information of the lunar soil reflected light; and the resource distribution and content and the physical characteristics of the original lunar soil are inversed by using the polarization spectrum characteristics of the lunar soil. According to the invention, in-situ exploration of lunar subsurface depth profile mineral resources can be realized.

The invention relates to the technical field of rubber performance evaluation, in particular to a performance data analysis and evaluation method for a rubber material. The method comprises the following steps: acquiring X-ray scanning data of a rubber sample; performing phase contrast imaging on the X-ray scanning data of the rubber sample to obtain projection data of the rubber sample; performing back projection reconstruction on the projection data of the rubber sample to obtain three-dimensional structural data of the rubber material; carrying out multi-parameter environmental simulation loading on the rubber sample to obtain environmental response data of the rubber material; dynamically collecting the environmental response data of the rubber material to obtain deformation process data of the rubber material; synchronously recording and analyzing the deformation process data of the rubber material to obtain a stress-strain characteristic pattern of the rubber material; and performing polarization spectrum excitation on the rubber sample based on the rubber material stress-strain characteristic pattern to obtain rubber molecular chain fluorescence data. According to the invention, the reliability and accuracy of rubber material performance evaluation are improved.

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 an intermediate infrared polarization spectrum imaging method and device. The method comprises the following steps: carrying out joint coding on an intermediate infrared light beam carrying to-be-measured target space, spectrum and polarization information by adopting an intermediate infrared polarization spectrum modulator consisting of metasurface units which are arranged in an array and have non-correlation response characteristics; projecting the coding light field to a two-dimensional detector array to generate a two-dimensional coding image under single exposure; and decoding the two-dimensional coding image through a reconstruction unit so as to reconstruct and obtain a space-spectrum-polarization four-dimensional data cube of the target to be measured. The problem that polarization information cannot be rapidly obtained in the prior art is solved, target full information can be obtained under single exposure, and the system has the advantages of being high in imaging speed, simple in structure, easy to miniaturize and the like.

The invention relates to a polarization spectrometer, in particular to a pitch-adjustable polarization spectrometer based on cholesteric cellulose chiral liquid crystal. The polarization spectrometer is prepared by adopting the following method: step 1, regulating and controlling the screw pitch of cholesteric cellulose chiral liquid crystal; step 2, preparing a flexible PDMS film; step 3, preparing a patterned PDMS through hole film; 4, treating the surface of the glass sheet; step 5, filling cholesteric cellulose chiral liquid crystals; and step 6, orienting the cholesteric cellulose chiral liquid crystal to obtain the pitch-adjustable polarization spectrometer with the film-shaped patterned cholesteric cellulose chiral liquid crystal. The problems that a traditional small-molecule liquid crystal chiral agent is difficult to regulate and control the screw pitch of the cholesteric phase cellulose chiral liquid crystal and easy to agglomerate can be solved, and simple preparation of the screw pitch-adjustable cholesteric phase cellulose chiral liquid crystal is achieved; and meanwhile, transmission of right-handed circularly polarized light and selective reflection of left-handed circularly polarized light are realized by utilizing the patterned cholesteric cellulose chiral liquid crystal.

The invention provides a video-level polarization spectrum imaging system and method. The system comprises an imaging unit, a polarization spectrum coupling unit, a data processing unit and an output unit, the imaging unit is used for imaging a target object on an imaging plane; the polarization spectrum coupling unit comprises a multi-channel spectrum modulation diaphragm and a micro-polarization focal plane array; the multi-channel spectrum modulation diaphragm is used for dividing incident light into a plurality of different spectrum channels; the micro-polarization focal plane array is used for converting the spectrum modulation light into polarized light of a plurality of different angles; the data processing unit is used for fusing the spectral information, the polarization information and the pixel information into multi-dimensional polarization spectral data; and the output unit is used for transmitting the polarization spectrum data to a computer. The system obtains spectrum information through a spectrum modulation diaphragm so as to distinguish the material composition and the chemical property of a target object; according to the system, polarization imaging is carried out through the micro-polarization focal plane array, and the detectability and the recognition rate of a target object can be improved.

The invention provides an all-day water body circular polarization hyperspectral measurement method and device. The method provided by the invention comprises the following steps: respectively transmitting circularly polarized white light and linearly polarized white light to a first spectrograph and a second spectrograph, constructing a first equation based on the received circularly polarized white light information, and constructing a second equation based on the received linearly polarized white light information; solving a first correction coefficient and a second correction coefficient by combining the first equation and the second equation; emitting a circular polarization white light source above the horizontal plane of the water area to be detected, receiving scattered light information of substances in the water area to be detected, and correcting the received scattered light information based on a first correction coefficient and a second correction coefficient; and searching and determining target substance attributes corresponding to the actually measured circularly polarized light spectrum curve based on the actually measured circularly polarized light spectrum curve and the circularly polarized light spectrum curve standard library. The all-day water body circular polarization hyperspectral measurement method and device provided by the invention are used for realizing all-day water body circular polarization hyperspectral accurate detection.

An apparatus and method of determining the concentration of first and second substances within a sample by exposing the sample to radiation and filtering the radiation transmitted from the sample using a first filter having a number of pass bands at wavelengths corresponding to absorption peaks in a desired quasi-periodic absorption spectrum of the first substance to be detected, and modulating the wavelengths of the pass bands of the first filter. Additionally, filtering the radiation transmitted from the sample using a second filter having a number of pass bands at wavelengths corresponding to absorption peaks in a desired quasi-periodic absorption spectrum of the second substance to be detected, and modulating the wavelengths of the pass bands of the second filter. The concentration of the first and second substances is determined by determining the difference in the maximum and the minimum intensities of the radiation transmitted by the sample.

The invention discloses a road intelligent diagnosis method based on an AI large model, and relates to the technical field of road engineering detection, and the method comprises the following steps: building a unified time base line, constructing a phase reference field, injecting a calibration pulse, separating dynamic shadow time sequence texture and crack initial features in a road image sequence, and obtaining a road image sequence; generating prior information of dynamic shadows and cracks; under the constraint of prior information, polarization spectrum three-dimensional coding imaging is carried out, polarization angle distribution and spectrum gradient are extracted, a feature dictionary of dynamic shadows and cracks is constructed, and phase drift in the prior information is calibrated. According to the method, a unified time base line and a phase reference field are constructed, and accurate distinguishing of dynamic shadows and cracks is realized by combining polarization spectrum imaging and anti-fact distillation; the point cloud and acceleration data are fused for geometric reconstruction, and through phase conjugate extinguishing and closed-loop feedback, the continuity and accuracy of diagnosis are significantly improved, and maintenance error decisions caused by misjudgment are avoided.

The invention relates to the technical field of micro-nano optics, and particularly provides a detection metasurface, a spectral polarization detection method and a construction method of the metasurface. The detection metasurface comprises a substrate and dielectric cylinders arranged on the surface of the substrate. Wherein the phase parameter of the dielectric cylinder meets a preset detection condition; the preset detection condition comprises that the positions of the light with different wavelengths or / and different polarization states on the focusing focus of the focal plane are different. Because the phase parameter of the dielectric cylinder meets the preset detection condition, incident light with different wavelengths or / and different polarization states can be focused at different positions of a focal plane based on the detection metasurface, and then spectral information and polarization information contained in the incident light are determined based on the position and light intensity of a focusing point. Therefore, spectrum information and polarization information can be obtained in real time through single detection based on the detection metasurface, real-time polarization spectrum detection is achieved, the information obtaining dimension is improved, and meanwhile the detection efficiency and the dynamic object detection capacity are improved.

The application provides a satellite-borne multi-viewing-angle polarization spectrum imaging system for aerosol optical parameter measurement, and belongs to the technical field of optical imaging. The system is loaded on a satellite platform and comprises a telescope objective, a multi-slit assembly, a light-splitting prism, a collimating lens group, a plane grating group, an imaging lens group, a depolarization light-splitting prism group, a polaroid group and a detector group. The system is based on static multi-viewing-angle synchronous observation design, and realizes high-precision detection of aerosol optical parameters through multi-viewing-angle, hyperspectral and full-polarization multi-dimensional information fusion.

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

The application 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 discloses a wine quality AI visual detection method, and relates to the technical field of wine quality detection. The method comprises the following steps: pretreating a wine sample; polarization spectrum images in different wave bands and different polarization directions are collected through a multispectral polarization imaging system and preprocessed; segmenting a microorganism region based on a polarization degree threshold, and extracting polarization spectrum feature vectors of microorganisms; extracting morphological feature vectors of the microorganisms; fusing the two feature vectors to construct a feature fusion matrix, and inputting the feature fusion matrix into an improved attention mechanism convolutional neural network model for training to obtain a wine quality AI detection model; after a sample to be detected is processed, the model is input to obtain a quality index predicted value, and quality grade judgment is achieved. According to the invention, the multispectral polarization imaging technology and microbial morphological characteristic analysis are combined, the anti-interference capability is strong, the detection precision and efficiency are high, the rapid, lossless and accurate detection of the wine quality is realized, and the practical value is high.

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 present invention proposes a single-exposure hyperspectral imaging system based on intensity-polarization combined modulation mask and its detection method, comprising an excitation light source group, a compression acquisition module, a reconstruction module, and a polarization noise reduction module. The excitation light source group generates linearly polarized light to illuminate the object under test, causing it to produce photoluminescence or Raman scattering. The compression acquisition module receives the signal and completes the compression acquisition. The reconstruction module uses a deep learning algorithm to reconstruct the full polarization spectrum image data from the compressed observation image. The polarization noise reduction module removes the mirror reflection noise component and outputs the noise-reduced photoluminescence or Raman scattering hyperspectral image data. The present invention can quickly and stably complete photoluminescence and Raman scattering spectral imaging, improve material detection efficiency and signal-to-noise ratio, and is suitable for fields such as semiconductor detection.

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 relates to a polarization spectrum imaging technology, in particular to a high-energy-efficiency stacked integrated polarization spectrum modulator and a preparation method thereof, and a polarization spectrum imaging system and method, and solves the technical problems that an existing polarization spectrum imaging system is low in measurement efficiency, high in loss, large in size and complex to regulate and control. The high-energy-efficiency stacked integrated polarization spectrum modulator is formed by sequentially stacking the polarization unit, the dynamic modulation layer and the spectrum unit, an additional modulator is adopted to directly control the polarization modulation layer and the spectrum modulation layer of the dynamic modulation layer to achieve fine modulation of polarization information and spectrum information, the size is small, and the regulation and control method is simple; each micro-area of the polarization unit and the spectrum unit adopts a beam splitting structure, so that the energy loss is relatively low; a polarization modulation layer and a spectrum modulation layer of the dynamic modulation layer are respectively located at two sides of the conductive base layer, can be independently controlled, are respectively and directly connected with each micro-area of the polarization unit and the spectrum unit, and can respectively realize cooperative control of polarization information and spectrum information.

The present invention relates to a polarization spectrum video compression acquisition system, which belongs to the field of computational imaging; it includes a lens group, a spatial coding random modulation module S1, a spectral dispersion modulation module S2, a pixel polarization detector module S3 and a high-precision polarization spectrum data reconstruction module S4; the present invention can realize efficient compression acquisition and reconstruction of multi-dimensional light field data containing polarization information, spectral information and spatial information. Polarization spectrum information in a scene can be compressed and acquired by a single exposure, polarization spectrum information of 4 polarization angles can be acquired by a high-precision compressed sensing reconstruction algorithm, and polarization spectrum video acquisition can be realized in a continuous sampling mode. The present invention can reduce the complexity of system hardware, and has the characteristics of low data acquisition volume and efficient acquisition of high-resolution polarization spectrum video.

The application discloses a three-dimensional light-thermal parameter reconstruction method and system for a combustion process, and belongs to the field of combustion diagnosis.The application solves the problems of low measurement accuracy in a high-temperature environment and poor accuracy of extracting effective signals in a complex background existing in the prior art light field parameter measurement.The application adopts a polarization spectrum camera and a light field camera to synchronously perform multi-angle data acquisition on a combustion area, and acquires polarization spectrum data and light field data of the combustion area;light field depth information is extracted from the light field data, a three-dimensional structure of the combustion area is constructed by combining the light field depth information with a light field reconstruction algorithm, spectral analysis is performed on the polarization spectrum data, and polarization degree and polarization angle information of the polarization spectrum are acquired;the three-dimensional structure is combined with a CT reconstruction algorithm; a three-dimensional distribution field of particulate matters in the combustion process is acquired; and based on the polarization spectrum information and the preprocessed light field data, the three-dimensional temperature field and the concentration field distribution of gases in the combustion area are calculated by using the optimized three-dimensional structure.The application is mainly used for combustion product parameter acquisition.

A polarization spectral filter is provided, comprising: a first reflector and a second reflector, which are arranged to face each other in a first direction; and a grating layer, which is arranged between the first reflector and the second reflector. The grating layer includes a plurality of first grating elements and a plurality of second grating elements, and the plurality of first grating elements and the plurality of second grating elements are alternately arranged in a second direction perpendicular to the first direction. The plurality of first grating elements include a first dielectric material having a first refractive index. The plurality of second grating elements include a second dielectric material having a second refractive index different from the first refractive index.

The invention relates to a polarization spectrum device, in particular to an integrated polarization spectrum device for noninvasive blood glucose measurement and a blood glucose measurement method, and solves the technical problem of low blood glucose measurement precision caused by the problems of low optical parameter dimension, complex algorithm processing, overfitting and the like of the existing noninvasive blood glucose measurement device. According to the integrated polarization spectrum device for noninvasive blood glucose measurement, polarization signals and multispectral signals are obtained through the polarization path and the spectrum path respectively, compared with a traditional blood glucose measurement method, the optical information dimension of the integrated polarization spectrum device is effectively improved, efficient complementation of spectrum information and polarization information can be achieved, and therefore the blood glucose measurement precision is improved. The invention further provides a blood glucose measurement method, the LSTM neural network is adopted for blood glucose prediction, the problem of overfitting of high-dimensional polarization spectrum information by a traditional BP neural network can be avoided, and the blood glucose prediction precision is improved.

The invention discloses a polarization-spectrum coupling-based ghosting regulation and control infrared system and a ghosting elimination method, and the system comprises a reflecting layer which reflects the radiation light of an imaged object and generates a ghosting signal; the rotation angle theta of the rotatable polaroid is matched with the black phosphorus crystal axis direction of the black phosphorus spectrum polarization coupling infrared photoelectric detector; according to the black phosphorus spectrum polarization coupling infrared photoelectric detector, a SiO2 / Si substrate serves as an insulating supporting layer, a graphene layer is arranged on the SiO2 / Si substrate, an InSe thin film covers the graphene layer to form an II-type heterojunction interface, a black phosphorus layer serves as a core photosensitive layer on the InSe thin film, Cr / Au metal composite electrodes are deposited on the graphene layer and the black phosphorus layer respectively, and the Cr / Au metal composite electrodes are arranged on the core photosensitive layer. A real signal and a ghosting signal are distinguished according to the characteristic that the anisotropy ratio PER (lambda) in a black phosphorus layer changes along with wave bands and the difference of light response values I-alpha T4 / PER (lambda), and the ghosting elimination system and method which are miniaturized and have self-driving capacity are provided.

The ghost elimination method based on polarization-spectrum coupling of the ghost elimination method of the present application comprises a reflection layer, which reflects the radiation light of an imaged object and generates a ghost signal; a rotatable polarizer, the rotation angle theta is matched with the black phosphorus crystal axis direction of the black phosphorus spectrum polarization coupled infrared photodetector; the black phosphorus spectrum polarization coupled infrared photodetector is sequentially arranged from bottom to top as follows: SiO2 / Si substrate as an insulating support layer, graphene layer on the SiO2 / Si substrate, InSe thin film covering the graphene layer to form a type II heterojunction interface, black phosphorus layer on the InSe thin film as a core photosensitive layer, Cr / Au metal composite electrode deposited on the graphene layer and the black phosphorus layer respectively, the in-plane anisotropy ratio PER(lambda) of the black phosphorus layer changes with the wavelength, and the difference between the light response value I~alpha T 4 / PER(lambda) distinguishes the real signal from the ghost signal, and provides a miniaturized, self-driven ghost elimination system and method.

The invention relates to a rapid film thickness extraction method and device, and the method comprises the steps: obtaining the spectrums of a plurality of films, the spectrums comprising a light intensity spectrum, a reflectivity spectrum, a polarization spectrum and a simulation spectrum; determining a hash function of the spectrums, calculating a hash value of each spectrum through the hash function, and mapping a plurality of similar spectrums into a hash bucket through the hash value of each spectrum; constructing a hash index based on each spectrum and the corresponding hash value; acquiring a to-be-measured thin film spectrum and calculating a hash value of the to-be-measured thin film spectrum; on the basis of the Hash value, calculating a Hash bucket where the spectrum of the thin film to be detected is located through a Hash index; and matching the most similar spectrum from the hash bucket, and determining the thickness of the film to be measured according to the most similar spectrum. The spectrum Hash index is constructed through the locality sensitive Hash method, and the spectrum matching efficiency, accuracy and flexibility are improved.

The invention relates to a method and a device for detecting defects of a thin-wall layer coated with solder paste. The method comprises the following steps: performing dual-wavelength polarized light scanning on thin-wall layer solder paste on a PCB (Printed Circuit Board) to obtain a polarization spectrum data set; performing pulse laser irradiation and ultrasonic signal acquisition on the thin-wall layer solder paste to obtain a thermo-acoustic coupling response data set; performing fluorescence lifetime imaging scanning on the thin-wall layer solder paste mixed with the quantum dots in advance to obtain a fluorescence parameter data set; and inputting the polarization spectrum data set, the thermal-acoustic coupling response data set and the fluorescence parameter data set into an attention guidance deformation convolutional network for feature extraction and fusion, and outputting a comprehensive detection report. According to the invention, the detection capability of different depth areas is enhanced, the accurate characterization of the internal acoustic characteristics of the thin-wall layer is realized, and the defect detection precision of the thin-wall layer is improved.

A method for calibrating the reference direction of an intensity modulation module of a channel-type polarization spectrometer relates to the technical field of optical device calibration and solves the problem of poor accuracy of existing mechanical calibration. The method comprises: placing a light source, a collimator, a calibration polarizer, an intensity modulation module to be calibrated, and a first spectrometer on the same optical axis, with the transmission axis direction of the calibration polarizer corresponding to the 0° linear polarization direction of the linear polarizer; calculating the maximum value of the theoretical light intensity response data of the first spectrometer at different wavelengths, and selecting the wavelength at which the light intensity response reaches a local maximum; rotating the calibration polarizer and simultaneously recording the light intensity response values of the first spectrometer at different wavelengths under the transmission axis directions of the calibration polarizer; processing the light intensity response values of the first spectrometer to obtain the transmission axis direction of the calibration polarizer corresponding to the maximum light intensity response value of the first spectrometer; and using the transmission axis direction of the calibration polarizer as the reference direction of the intensity modulation module to be calibrated. The method has high calibration accuracy, a simple process, and is easy to implement in engineering.

The present application relates to the technical field of optical device calibration, and particularly relates to a kind of polarization radiation joint calibration method of secondary imaging spectral polarization camera, method includes: according to the digital signal value of each polarization pixel output of incident non-polarized monochromatic light, determine the spectral band corresponding to each polarization pixel, establish calibration pixel group based on spectral band, establish the mapping relationship of polarization element and filter element;Measure the dark current characteristics of polarization element, construct dark current correction matrix;Different wavelength, different linear polarization angle complete linear polarization monochromatic light is input in turn, and calibration data is collected;Pretreatment calibration data, pretreatment includes dark current correction;Based on calibration pixel group, extract the effective response value in pretreated calibration data;With the spectral stokes vector of incident light field as input, with effective response value as output, solve system response matrix.The present application significantly improves calibration accuracy and inversion accuracy of polarization spectral imaging detection.