204results about "Polarisation spectroscopy" patented technology

The invention discloses a distributed polarization detection system and method based on position regulation and control target reconstruction, and belongs to the field of distributed polarization cooperative detection and photoelectronic imaging. The distributed polarization detection system comprises a lighting device, a multi-parameter auxiliary detection objective table and a long-wave infrared polarization detection device; the long-wave infrared polarization detection device is provided with three sub-polarization detection devices, the method is implemented based on a distributed polarization detection system, and polarization information in three different directions can be collected at the same time through the distributed polarization detection system based on position regulation and control target reconstruction. The identification capability of the disguised / similar target at a single angle is improved; and errors caused by time delay are avoided. Polarization information obtained by reasonably distributing detection positions is mutually supplemented, polarization images are mutually fused, target signals are effectively extracted from scattered light to analyze the polarization characteristic difference between interference light and target reflected light, and the resolution, contrast and detection distance of polarization imaging can be improved.

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 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 method for constructing a polarization calibration precision model of a focal plane visible light polarization detector and application. According to the method, a comprehensive matrix form is formed by combining response models of four polarization channels of the detector, and a final target model is obtained through verification and continuous correction. The matrix method can more systematically describe the mutual relation among the channels, so that quantization characteristics such as the degree of polarization (DoLP) can be more accurately calculated through a plurality of response values, and higher calculation efficiency and higher adaptability are achieved.

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.

In one embodiment, a system includes a pump light source configured to produce a pump beam of light at a pump frequency and a Stokes light source configured to produce a Stokes beam of light at a Stokes frequency, where the pump and Stokes frequencies are offset by a frequency offset Ω. The system also includes one or more optical elements configured to: direct the pump and Stokes beams of light to a sample, and collect a Raman signal produced by coherent Raman scattering of the pump and Stokes beams of light at the sample. The system further includes an optical receiver configured to detect the Raman signal. The optical receiver includes a probe light source configured to produce a probe beam of light at a probe frequency, where the probe light source includes a wavelength-tunable laser.

In one embodiment, a system includes a first light source configured to produce a first beam of light at a first frequency and a second light source configured to produce a second beam of light at a second frequency, where the first and second frequencies are offset by a frequency offset Ω. The system also includes one or more optical elements configured to: direct the first and second beams of light to a sample, and collect a Raman signal produced by coherent Raman scattering of the first and second beams of light within the sample. The system further includes an optical receiver configured to detect the Raman signal. The optical receiver includes a third light source configured to produce a third beam of light at a third frequency, and an optical detector configured to coherently mix a portion of the Raman signal with the third beam of light.

In one embodiment, a Raman spectroscopy system includes a pump light source configured to produce a pump beam of light at a pump frequency and a Stokes light source configured to produce a Stokes beam of light at a Stokes frequency, where the pump and Stokes frequencies are offset by a frequency offset Ω. The system further includes one or more optical fibers configured to (i) direct the pump and Stokes beams to a sample located external to the system and (ii) direct a Raman signal to the system, where the Raman signal is produced by coherent Raman scattering of the pump and Stokes beams of light at the sample. The system also includes an optical receiver configured to detect the Raman signal. The optical receiver includes a probe light source and an optical detector configured to coherently mix the Raman signal with a probe beam of light.

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 relates to the technical field of optics, in particular to a low-crosstalk channel modulation interference polarization spectrum detection method and system, and the system comprises a half-field telescopic module, a phase modulation module, an interference modulation module and a detection module. The half-view-field telescope module is used for performing lower half-view-field beam collimation on an input target beam, the target beam is propagated to the phase modulation module in parallel according to a set range, a composite polarization splitting prism group in the phase modulation module performs light splitting operation based on the target beam output by the half-view-field telescope module, and two parallel polarized lights are emitted, independent phase modulation of the two paths of light is ensured; and the interference modulation module is used for performing light splitting modulation according to the two paths of polarized light to ensure that the two paths of modulated polarized light beams interfere with each other and are transmitted to the detection module for imaging. According to the system, the detection precision of a narrow-band polarization spectrum or a polarization spectrum with an obvious narrow-band wave crest and a narrow-band absorption peak is improved, the polarization spectrum detection capability is high, and the application range is wide.

The invention relates to an optical path multiplexing type snapshot polarization spectrum three-dimensional combined imaging detection system, which is based on an optical path multiplexing double-channel combined imaging structure and is divided into a polarization channel and a polarization spectrum channel through a main optical path splitting system. Wherein the polarization channel obtains a high-spatial-resolution polarization image of a target, the high-spatial-resolution polarization image can serve as input data of polarization three-dimensional data inversion of the target and can also serve as spatial prior information of polarization spectrum image reconstruction of the target, and definition and accuracy of polarization spectrum image reconstruction of the target are improved; a polarization spectrum channel adopts an optical path multiplexing type structure, the system structure complexity and the installation and adjustment difficulty are reduced, and an obtained polarization spectrum image can be used as input data for inversion of a polarization spectrum reflectivity curve of a target. The system can provide polarization, spectrum and three-dimensional combined imaging data of the target at the same time, and can effectively improve the target recognition precision and the target material classification accuracy in the aspect of material target classification in a complex background environment.

The invention belongs to the field of ultrafast laser design and hyperspectral imaging, and provides an active spectrum modulation ultrafast laser and a hyperspectral detection system and method thereof, and the technical scheme is that the active spectrum modulation ultrafast laser comprises an ultrafast pulse laser, a primary polarization modulation module, a nonlinear broadening module and a secondary polarization modulation module; narrow-spectrum pulse laser emitted by the ultrafast pulse laser enters the nonlinear broadening module to be subjected to spectrum broadening to obtain wide-spectrum pulse laser after being subjected to preliminary modulation of the polarization state of laser of all wave bands through the preliminary modulation module, and the wide-spectrum pulse laser emitted by the nonlinear broadening module enters the secondary polarization modulation module to be subjected to spectrum broadening to obtain wide-spectrum pulse laser. And after randomizing the polarization state of each spectrum, irradiating the spectrums to a target scene. After the spectrum is modulated, the camera is controlled to collect the reflectivity intensity information of the target scene, and after irradiation and image collection of multiple groups of selected spectrum structures are completed, hyperspectral detection of the target scene is achieved in combination with the measured spectrum distribution and the corresponding reflectivity information.

In one embodiment, a system includes a first light source configured to produce a first beam of light at a first frequency and a second light source configured to produce a second beam of light at a second frequency, where the first and second frequencies are offset by a frequency offset Ω. The system also includes one or more optical elements configured to: direct the first and second beams of light to a sample, and collect a Raman signal produced by the sample in response to the first and second beams of light. The system further includes an optical receiver configured to detect the Raman signal. The optical receiver includes a third light source configured to produce a third beam of light at a third frequency, and one or more optical detectors configured to coherently mix a portion of the Raman with a portion of the third beam of light.

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.

According to the single-photon laser multispectral polarization detection method and system under underwater turbulence disturbance provided by the invention, pulse laser is emitted to a target after being scanned, and weak echoes of the pulse laser are received by a double-photon detector and a single-photon detector after being subjected to spectral filtering and spatial polarization beam splitting. A time correlation single photon counting technology is adopted, time, polarization and wavelength information of each photon is recorded synchronously, and a multi-dimensional data set is generated in combination with a scanning angle. After turbulence noise is suppressed through preprocessing, target distance information is extracted to generate a three-dimensional point cloud, and the polarization degree and the depolarization ratio of each pixel point are calculated; and finally, geometric, polarization and spectral data are fused, a high-precision three-dimensional terrain and polarization image is generated, and accurate target identification in a complex underwater environment is realized. According to the invention, a set of multi-dimensional information sensing system capable of carrying out long-distance, high-resolution and high-precision classification and identification on a target in a complex underwater environment with strong attenuation, strong noise and strong turbulence disturbance is constructed.

The invention discloses a stress regulation-based micro spectrometer system of a transparent polymer material. The system comprises a polarization modulation unit, a transparent polymer layer, an imaging detector and a spectrum reconstruction module. The transparent polymer material is stretched by a specific design and then is arranged between the two polarizing films of the polarization modulation unit, and the imaging detector chip is arranged at the bottom layer of the device. And the spectrum reconstruction module performs spectrum reconstruction on the data received by the imaging detector by applying a calculation spectrum reconstruction algorithm to restore the original spectrum data received by the whole device. According to the technical scheme, a new spectrum detection thought is provided, and high-resolution spectrum analysis can be carried out in each wave band while the size of a miniature device is ensured by adjusting the applicable wave band of each component.

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.

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 invention discloses an underwater polarization imaging method based on a Stokes vector, and the method comprises the following steps: 1, obtaining a plurality of polarization images with different polarization directions, so as to obtain the Stokes vector of each polarization image; step 2, based on the Stokes vector of each polarization image, obtaining a Stokes vector model of back scattering light through frequency domain filtering; 3, according to the Stokes vector model of the backscattered light, obtaining a backscattered light image of any polarization angle, solving a maximum backscattered light image in combination with the low-rank characteristic of the backscattered light image, correlating a minimum backscattered light image by using the degree of polarization, and finally fusing the minimum backscattered light image into an underwater imaging physical model to establish a restored image inversion model; and 4, according to the restored image inversion model, obtaining a final imaging result.

An optical measurement system, the optical measurement system comprises optics, wherein the optics include a collection path and an illumination path and an objective lens. The optics is configured to acquire Raman spectrums of one or more structural elements located at a measurement site of the sample while being set-up to apply one or more optics parameters that comprise an illumination angle out of a set of multiple illumination angles that correspond to a numerical aperture of the objective lens. Each of the one or more structural elements has a dimension that ranges between one tenth of nanometer to one hundred microns; an optical spectrometer; a Raman detector that is downstream to the optical spectrometer; and a control unit that is configured to determine an expected radiation pattern to be detected by the Raman detector when the optics are set-up to apply the one or more optics parameters.

The invention provides a light field detector based on a micro-nano optical structure and a light field imager. The light field detector comprises a substrate, an active region, an electrode and the micro-nano optical structure, wherein the micro-nano optical structure is prepared on the surface of the active region and / or the electrode; the micro-nano optical structure prepared in the active area is used for regulating and controlling the light field distribution of incident light in the active area, and the micro-nano optical structure prepared on the surface of the electrode is used for regulating and controlling the transmittance of the incident light, so that the light field detector generates different adjustable and controllable light responses to the incident light carrying different optical information under the driving of different voltages. Therefore, the adjustable reconstruction of the multi-dimensional optical information of the incident light can be realized. The optical information comprises wavelength information, optical power information, optical polarization information and optical phase information.

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.

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

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.

A split focal plane polarization detector based on the collaborative design of metasurface and pixel mesa, comprising: a metasurface structure, which selects a pixel-level full Stokes polarization-sensitive metasurface structure, including a plurality of metasurface structure units distributed in an array, for preliminary polarization decoupling and directional convergence; a focal plane pixel array that is pixel-level registered with the metasurface structure, including a multi-plane array composed of a plurality of pixels, and each pixel is provided with a mesa; the side length of each mesa ranges from 2 to 3 times the full width at half maximum of the spot converged by the metasurface structure unit, so as to balance the energy utilization efficiency of each pixel for the light field, suppress the optical signal crosstalk in the non-converging center region and even adjacent pixels, and further improve the polarization extinction ratio on the basis of the polarization decoupling of the metasurface structure. The present invention realizes preliminary polarization decoupling, and the collaborative design of the combined secondary pixel mesa suppresses the crosstalk between adjacent pixels, breaking through the polarization extinction performance of a single metasurface.

A device for performing polarization-resolved Raman spectroscopy on a sample (15), in particular a crystalline sample, the device comprising: at least one light source (11), in particular at least one laser, for providing excitation radiation to the sample (15); a spectrometer (31) for separating light from the sample (15), in particular Raman scattered light from the sample (15), into at least one spectrum of spatially separated wavelength components, and for directing at least a portion of the at least one spectrum to a detector (29), in particular a CCD detector; a polarization state control element (27) for the light from the sample (15), the polarization state control element (27) being arranged in the light path of at least one light beam (25) travelling from the sample (15) towards the detector (29), and the polarization state control element (27) comprising at least one polarization-sensitive optical element (45, 47), in particular a Wollaston prism, the at least one polarization-sensitive optical element being suitable for separating the at least one light beam (25) into at least two, in particular orthogonal polarized light beams (35a, 35b, 37a, 37b).

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 invention provides a light-splitting imaging system, and relates to the technical field of optics, the light-splitting imaging system comprises a light-splitting module and a detection device, the light-splitting module comprises a light path conduction assembly and a plurality of light-splitting modules, and the plurality of light-splitting modules are distributed on a propagation path of a light signal; the detection device is arranged on the light emitting sides of the light splitting modules and comprises a plurality of detection units which are in one-to-one correspondence with the light splitting signals. According to the invention, a plurality of light splitting modules can be adopted to separate the light signal into a plurality of light splitting signals according to different wavelengths and / or polarizations, each light splitting signal can keep the whole image and carry wavelength or polarization information at the same time, and a light signal array of a spectral dimension is expanded to a two-dimensional space. Therefore, the optical information of the spectral dimension can be obtained through one-time shooting of a plurality of detection units, image splicing processing is not needed, and the acquisition speed of the system can be greatly improved.