Imager capable of integrating full color and polarization hyperspectral detectability

Abstract

The invention relates to an imager capable of integrating full color and polarization hyperspectral detectability, comprising a front lens, a field diaphragm, a collimating lens, an acousto-optic tunable filter and a turning lens which are successively arranged on the same light path; after light is turned by the turning lens, a polarization hyperspectral imagining system is arranged on the lightpath of level-one diffraction light; and light is turned by the turning lens, the light path of level-zero diffraction light is provided with a full-color light imaging system. The invention providesa programmable polarization hyperspectral and full-color combined imager which splices an O-light image with an E-light image on the photosensitive surface of the same detector by an optical splicingdevice, causes the system structure to be compact by light path turning, carries out image drift compensation by an optical wedge compensating device and an image registration algorithm, realizes multi-frequency acousto-optic tunable filter (AOFT) driving based on any waveform generator scheme and can simultaneously obtain full-color image information and narrow-band cross polarization image information.

Description

technical field [0001] The invention relates to a spectral imager, in particular to an imager integrating panchromatic and polarization hyperspectral detection capabilities. Background technique [0002] Spectral image information can be used to obtain target material composition, content and other chemical characteristics and spatial distribution information. Therefore, imaging spectroscopy technology has broad application prospects in various fields of national economy and society. [0003] First of all, the imaging spectrometer can be used as the payload of the spacecraft, and the spectral information obtained by using it can be applied to the following fields: land resource survey (mineral exploration, urban planning, suburban land classification and utilization, land desertification control and soil erosion monitoring, etc.), forestry (forestry resource survey and forest logging and afforestation monitoring, etc.), ecology (environmental monitoring, terrestrial ecologic...

AI Technical Summary

Problems solved by technology

However, the existing technical solutions have the following defects: (1) two detectors are required to obtain the O-ray image and the E-ray image respectively, which undoubtedly complicates the system structure and increases the cost; (2) the image drift caused by AOTF tuning is not compensated, As a result, the signal-to-noise ratio of the restored spectrum deteriorates due to spectrum aliasing; (3) The AOTF drive device uses a DDS chip, which can only work in single-frequency mode, and cannot obtain multi-spectrum composite images in multi-frequency mode; (4) does not use Zero-order diffracted light information; (5) There is no optical path turning, resulting in a longer system structure size

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