162results about "Polarisation spectroscopy" patented technology

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

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.

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 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.

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.

A digital micromirror chip, a dispersion element, a spectrum-polarization regulator, a photoelectric detector and a control device are arranged, the digital micromirror chip comprises a micromirror matrix composed of a plurality of micromirrors, each micromirror in the micromirror matrix has a light-passing state and a light-shielding state, and the spectrum-polarization regulator and the photoelectric detector are connected with the digital micromirror chip. The state of each micro-mirror is independently controlled by the control equipment, a broadband filter device, a plurality of narrow-band filter devices and a plurality of linear polarization filter devices are distributed on a turntable of the spectrum-polarization regulator in a surrounding manner, and under the combination of the digital micro-mirror chip, the dispersion element, the spectrum-polarization regulator and the control equipment, the broadband filter device, the narrow-band filter devices and the linear polarization filter devices are distributed in a surrounding manner. Spectral polarization imaging of multiple channels can be achieved, and the technical requirement that three resolution ratios can simultaneously achieve the best in the spectral polarization imaging technology is met.

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.

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, where the third light source includes a wavelength-tunable laser, where the third frequency is adjustable.

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 invention relates to the field of remote sensing detection imaging systems, in particular to a polarization hyperspectral imaging system, an imaging method and application, and the system comprises a housing, an imaging lens, an imaging spectrometer, an area array polarization camera, a focusing translation assembly, a push-broom translation assembly and a processor. A mounting hole is formed in one side wall of the shell; the imaging lens is fixed on the casing through the mounting hole and extends out of the casing; an imaging spectrometer and an area array polarization camera are sequentially arranged in the machine shell from the imaging lens to the back, and the imaging spectrometer is connected with the area array polarization camera. The focusing translation assembly is arranged in the shell, the push-broom translation assembly is arranged on the focusing translation assembly, and the imaging spectrometer is arranged on the push-broom translation assembly; the processor is arranged in the machine shell and connected with the area array polarization camera, the focusing translation assembly and the push-broom translation assembly, and the processor is connected with an electronic output interface.

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

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

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

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

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