Hyperspectral full polarization imager based on acousto-optic filtering and electro-optical phase modulation

Abstract

The invention relates to the field of hyperspectral imager technology, in particular to a hyperspectral full polarization imager based on acousto-optic filtering and electro-optical phase modulation. The hyperspectral full polarization imager is an imaging device combining hyperspectral imaging and full polarization imaging, and relates to a method for simultaneous detection and acquisition of the space, spectral and polarization information of an observed object. The hyperspectral full polarization imager is based on an acousto-optic tunable filter for splitting and a DKDP longitudinal electro-optical phase modulator for polarization detection; and comprises a front imaging lens used for collection, collimation and contraction of radiation, reflection, scattering and transmission light of the object under test and primary imaging to an AOTF; DKDP longitudinal electro-optical phase modulators for phase modulation; the AOTF for filtering and polarization detection; a light shielding plate for shielding 0-level and +1-level diffracted light through the AOTF; a secondary imaging conduction lens for secondary imaging of -1-level diffracted light to a planar array imaging CCD; and a control computer. The invention is mainly used in the field of a hyperspectral imager.

Description

technical field [0001] The invention relates to the technical field of hyperspectral imagers, in particular to a hyperspectral full-polarization imager based on acousto-optic filtering and electro-optic phase tuning, which is an imaging device combining hyperspectral imaging and full-polarization imaging. A method for simultaneous detection and acquisition of spatial, spectral and polarization information of a target. Background technique [0002] Spectral polarization imaging technology is a combination of spectral imaging technology and polarization imaging technology. Spectral polarization imaging can simultaneously acquire the spatial, spectral and polarization information of the target, the geometric shape and shadow characteristics of the target, the spectral characteristics of radiation, reflection, scattering and transmission electromagnetic waves, and the physical and chemical characteristics of materials such as surface roughness, density, conductivity, and water c...

AI Technical Summary

Problems solved by technology

(1) For spectral imaging technology, the spectral resolution and spatial resolution of dispersion-type imaging spectrum are restricted by the width of the slit, which limits the light flux entering the system, thereby reducing the signal-to-noise ratio of spectral imaging; The type needs to rotate the filter, and the number of bands is limited, and the spectral resolution is low

(2) For polarization imaging, the polarizer type needs to rotate the polarizer, and can only detect linearly polarized light, that is, the first three components of the Stokes parameter; the new polarization interference imaging spectroscopy technology can obtain the full polarization spectrum at the same time, but requires The relative movement between the instrument and the detection target, the push-broom completes the acquisition of the target interferogram, the target image restoration is quite complicated and difficult, the band noise is serious, and the spatial resolution is low

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