Electronic scanning video hyperspectral imager based on liquid crystal light valve

Abstract

The invention discloses an electronic scanning video hyperspectral imager based on a liquid crystal light valve. A system comprises five parts including an imaging lens, a programmable electronic liquid crystal light valve, a slitless dispersion type spectrometer component, a detector and a data processing system. According to the system, a slit of the dispersion type hyperspectral imager is replaced with the programmable electronic liquid crystal light valve, the component can be controlled through voltage, light-transmitting data is loaded in sequence by utilizing a driving circuit, the light-transmitting characteristic of the corresponding position of the liquid crystal light valve is controlled, and a function of sequential space scanning is realized. A target signal penetrating through the light-transmitting position of the liquid crystal light valve enters the dispersion component, the detector captures image data at a focal plane, and a spectral imaging data cube of a target isextracted by utilizing a splicing algorithm. Compared with a traditional dispersion type hyperspectral imager, a mechanical push-broom process is omitted, mechanical movement components are reduced, and the hyperspectral imager has the advantages of being high in stability, high in integration degree and the like, and is suitable for relative rest observation platforms such as a tower observationplatform, a near space platform and the like.

Description

technical field [0001] The invention relates to an electronic scanning video hyperspectral imager based on a liquid crystal light valve, in particular to a hyperspectral imager that does not need a moving platform and relies on a liquid crystal light valve instead of a traditional slit to realize electronic scanning of an imaging space. Background technique: [0002] The development of dispersive imaging spectroscopy technology has experienced the technical development process from multi-band scanning imaging to push-broom imaging. At present, the hyperspectral imager based on the push-broom imaging mode is the mainstream solution in aerospace. This technology consists of the solid-state scanning of the area array detector and the steady forward flight of the satellite or aircraft to form a two-dimensional space scan, that is, push-broom. One of the two-dimensional area array devices completes the one-dimensional spatial imaging of the target scene, and the other dimension c...

AI Technical Summary

Problems solved by technology

However, in some occasions, the platform cannot meet the function of motion scanning, and the scanning mirror needs to be designed separately. When the spatial resolution of the hyperspectral imager is high, the difficulty of developing the scanning mirror increases geometrically, so that the use of push-broom hyperspectral imaging The scene is limited, especially when mounted on a geostationary orbit platform, the technical difficulty of the scanning mirror itself (especially high-precision scanning pixel-level control) even exceeds the instrument itself

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