67 results about "Polarized spectroscopy" patented technology

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.

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.

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.