67 results about "Polarized spectroscopy" patented technology

The invention discloses a polarized light sensitive long-wave infrared sub-wavelength grating MDM trapezoidal structure absorber. The structure absorber comprises a zinc sulfide substrate, wherein the bottom of the substrate is plated with an aluminum film, and an upper portion of the substrate is plated with a trapezoidal grating structure layer sequentially comprising an aluminum film, a zinc selenide film, an aluminum film, a germanium film and an aluminum film from bottom to top. According to the structure absorber, a processing technology combining photoetching, etching and film coating is adopted, translation regulation and control of the central wavelength of an absorption peak can be realized only by changing the duty ratio or period of the micro-nano structure, ultra-wide-angle narrow-band high absorption is realized under multiple azimuth angles, and simultaneous processing and preparation are realized for the same film layer of multiple groups of strip micro-nano structures in a full array area; problems that in a traditional coating process, due to the fact that coating is conducted for multiple times in a time-division and area-division mode, the order of magnitude of the number of times of coating is increased, and the relative parallelism of dissimilatory coating of multiple strips is difficult to guarantee are solved, machining efficiency is improved, machining and preparing difficulty and complexity of the polarization spectrum light splitting device in the full-array area are reduced, and innovative significance is achieved.

The invention relates to the field of films and discloses a polyethylene film and a preparation method thereof. The infrared polarization spectrum of the polyethylene film has characteristic absorption peaks at positions of 720 cm<-1> and 731 cm<-1>, d A<parallel>(lambda) is used to represent the infrared absorption degree of the film in a wavelength position of lambda when infrared polarized light is parallel to the longitudinal direction of the film, and A<perpendicular>(lambda) is used to represent the infrared absorption degree of the film at a wavelength position of lambda when infrared polarized light is perpendicular to the longitudinal direction of the film, D<lambda> is equal to the ratio of the A<parallel>(lambda) to the A<perpendicular>(lambda), E is equal to the ratio of A<parallel>(731) to A<parallel>(720), F is equal to the ratio of A<perpendicular>(731) to A<perpendicular>(720),D<720> is equal to or larger than 0.083 and is equal to or smaller than 0.83, D<731> is equalto or larger than 0.1 and is equal to or smaller than 1, E is equal to or larger than 0.5 and is equal to or smaller than 1.8, and F is equal to or larger than 0.4 and is equal to or smaller than 1.2.The polyethylene film provided by the invention has high anti-puncture strength, does not need filling particles, and is a single-layer film instead of a multi-layer composite film. The preparation process is simple and has great industrial application prospects.

The invention discloses an ultra-compact snapshot type polarization imaging detecting device and a detecting method. The detecting device comprises a lens array and a detector which are successively arranged in an incident light direction. A polarizing interferometer is arranged between the lens array and the detector or is arranged in front of the lens array. The polarizing interferometer comprises a line polarizer, a single-wedge-shaped birefringence prism with a wedge angle of beta and a line analyzer. The transmission directions of the line polarizer and the line analyzer are same and areat an angle of 45 DEG to the quick axis direction of the single-wedge-shaped birefringence prism. The line polarizer is arranged in front of the single-wedge-shaped birefringence prism. The light sensing surface of the detector is in the back focal plane of the lens array. The detector of the detecting device can acquire an interference image array of different corresponding light path differencesin one exposure period, thereby realizing no requirement for sampling of interference images which are symmetric relative to a zero light path difference. The number of the interference images is farsmaller than the sampling number required for satisfying a Nyquist's theorem. Spatial resolution is improved, and a polarization spectrum image with high spectrum resolution can be reconstructed by means of a compressed sensing algorithm.

The invention discloses a polarized light-sensitive long-wave infrared subwavelength grating MDM trapezoidal structure absorber, comprising a zinc sulfide substrate, the bottom of the substrate is plated with an aluminum film, and the upper part of the substrate is plated with aluminum film, selenization from bottom to top. The trapezoidal grating structure layer of zinc film, aluminum film, germanium film and aluminum film; the invention adopts the processing technology of photolithography, etching and coating, and can realize absorption only by changing the duty ratio or period of the micro-nano structure The translation regulation of the peak center wavelength, and the realization of ultra-wide-angle narrow-band high absorption under multi-azimuth angles, in the comprehensive array area, for the same film layer of multiple groups of striped micro-nano structures, to achieve simultaneous processing and preparation. It overcomes the problems of the order of magnitude increase in the number of coatings caused by multiple coatings in time-division and regional areas in the traditional coating process, and the difficulty of ensuring the relative parallelism of the multi-strip dissimilar coatings, improving the processing efficiency and reducing the polarization spectrum in the full array area. The difficulty and complexity of the fabrication of spectroscopic devices is of innovative significance.

The invention provides a high-resolution real-time polarization spectrum analysis device and method. The high-resolution real-time polarization spectrum analysis device includes a combined slit array, a collimating mirror, a grating, a focusing mirror and a photodetector. The arrayed polarizer in the combined slit array is composed of four polarizers with different polarization states, which form four polarization channels, and each column of the array slit has a different coding form, so that the back-end The imaging spectrum of the slits encodes the spatial position information of each column of slits; decoding is performed later, and the spectral information corresponding to each column of slits is restored from the superimposed spectral information. Each polarization channel corresponds to the spectrum of one or more columns of slits. Through the correspondence between the polarization channel and each column of slits, the high-resolution spectral distribution and polarization information (polarization state, degree of polarization) of the measured light can be obtained. Realize the real-time measurement and analysis of the spectrum and polarization information of the light field.

An embodiment of the present invention provides a method and device for identifying a target red date in a red date spectral image. The method includes: obtaining a polarized spectral image of red dates; based on the spatial frequency of each pixel in the polarized spectral image, the The target red dates in the polarization spectrum image are enhanced; the target red dates are identified from the enhanced polarization spectrum image. Since the characteristics of the target jujube in the image are enhanced by using the characteristic spectral polarization correlation and image spatial frequency correlation processing methods of jujube, the characteristics of the target jujube in the image become obvious, especially for images obtained under long-distance and complex lighting conditions. The small pixel scale in the jujube, and even the sub-pixel jujube features become obvious, which can be distinguished from the environmental background in the polarization spectrum image of the jujube, and the tiny pixel scale can be easily identified from the polarization spectrum image of the jujube , or even red dates at the sub-pixel scale.

The invention discloses a near-infrared polarization spectrum test device and method, specifically relates to the field of optical communication of a near-infrared waveband, and solves the defect thata conventional channel modulation technology fails to satisfy polarization spectrum tests of narrow-band optical signals of laser sources and DWDM combined light sources in high-speed optical communication. The near-infrared polarization spectrum test device comprises a collimating objective lens, a high-speed polarization modulation assembly, a collecting objective lens and an infrared scanningmonochromator arranged in sequence along the direction of an optical path, the high-speed polarization modulation assembly and the infrared scanning monochromator are connected with a control and dataprocessing system, the high-speed polarization modulation assembly comprises a first liquid crystal modulation phase retarder, a second liquid crystal modulation phase retarder and a near-infrared polaroid arranged in sequence along an optical axis, and the infrared scanning monochromator comprises an incidence slit, a polarizing beam splitter, a wide-spectrum-band quarter-wave plate, a reflective collimating objective lens, a planar holographic grating, a rotation stepping motor, a reflective collecting objective lens, a reflection slit and a single-point detector arranged in sequence alongthe optical axis.

Unpolarized broadband reflectors enabled by a serial arrangement of a pair of polarized subwavelength gratings are disclosed. Device illustrations include partially-etched crystalline-silicon films on quartz substrates and amorphous silicon films on glass. The individual reflectors exhibit extremely wide spectral reflection bands in one polarization. By arranging two such reflectors sequentially with orthogonal periodicities, there results an unpolarized spectral band that exceeds those of the individual polarized bands. In the prototypes disclosed, there results zero-order reflectance exceeding 97% under unpolarized light incidence over a 500-nm-wide wavelength band. This wideband represents a ˜44% fractional band in the near infrared spectral band. The elemental polarization-sensitive reflectors based on one-dimensional resonant gratings have simple design, robust performance, and are straightforward to fabricate. Hence, this technology is a promising alternative to traditional multilayer thin-film reflectors especially at longer wavelengths of light where multilayer deposition may be infeasible or impractical.

The present invention relates to a polarization hyperspectral observation system of natural water body and sea surface. The purpose is to realize in-situ observation of polarization hyperspectrum of natural water body, to detect the change law of polarization characteristics of visible light in the process of radiation transmission of natural water body, and to clarify the characteristics of ionized water radiation polarization spectrum and Intrinsic relationship between water color elements. In the present invention, three first hyperspectral radiance sensors, three second hyperspectral irradiance sensors and one hyperspectral irradiance sensor are arranged on the rotating pan-tilt assembly to realize 360-degree comprehensive observation, and at the same time, three hyperspectral irradiance sensors A linear polarizer is set at the detection ports of one hyperspectral radiance sensor and three second hyperspectral radiance sensors to realize on-site observation at different altitude angles, which can effectively avoid the sun's glare and pollution, and suppress sky diffuse. It can accurately measure the polarization spectrum of water-leaving radiation, and complete the polarization spectrum measurement of different observation geometries of natural water bodies.

The embodiment of the present invention discloses a near-ground remote sensing jujube water content detection method and device. The jujube water content detection method includes: obtaining outdoor spectral information of jujube, including: outdoor polarization characteristics and outdoor remote sensing index; The indoor spectral model and the outdoor inversion spectral model to determine the water content of jujube near the ground. The embodiment of the present invention realizes the detection of the water content of jujube near the ground based on the outdoor polarization spectrum information, and improves the detection accuracy.