DMD spatial dimension coding symmetric Offner dispersion medium wave infrared spectral imaging device

Abstract

The invention relates to a DMD spatial dimension coding symmetric Offner dispersion medium wave infrared spectral imaging device, and belongs to the technical field of infrared spectral imaging. The prior art has the disadvantages that the prior art cannot satisfy the demand for all-weather spectral imaging; the spatial resolution and the spectral resolution are low; the adopted microlens array process is complicated and difficult to process; and the adopted planar grating may cause spectral line bending and color distortion problems. The DMD spatial dimension coding symmetric Offner dispersion medium wave infrared spectral imaging device is characterized in that a working plane of a medium wave infrared DMD is located at an image plane of a medium wave infrared achromatic varifocal objective set; an object plane of a symmetric Offner dispersion system coincides with the image plane of the medium wave infrared achromatic varifocal objective set; a refrigeration medium wave infrared detector is arranged on an emitting optical path of the symmetric Offner dispersion system; and a photosensitive surface of the refrigeration medium wave infrared detector is located at the image plane of the symmetric Offner dispersion system; in the symmetric Offner dispersion system, a spherical reflector and a spherical reflection grating have the same curvature center; and the refrigeration medium wave infrared detector is connected with an image acquisition card, and the image acquisition card, a computer and the medium wave infrared DMD are sequentially connected.

Description

technical field [0001] The invention relates to a DMD space-dimensional coding symmetric Offner dispersion mid-wave infrared spectrum imaging device, which belongs to the technical field of infrared spectrum imaging. Background technique [0002] In order to solve the problem of weak spectrum and many noise sources in the spectral imaging system, an aperture-encoded spectral imaging technology based on DMD (Digital Micromirror Array) has appeared in the prior art. A Chinese invention patent application with the application publication number CN105675136A announced a solution entitled "A Coded Aperture Spectral Imaging System", which uses DMD as the coding device to realize spectral imaging. Such as figure 1 As shown, the coded aperture spectral imaging system is composed of a front imaging system 2 , a DMD 3 , a collimation system 4 , a reflective grating 5 , a microlens array 6 and a detector 7 . During the imaging process, the pre-imaging system 2 images the object 1 to ...

AI Technical Summary

Problems solved by technology

First of all, since the spectral imaging system is limited to the visible light spectral imaging band, it cannot meet the requirements of all-weather spectral imaging

Secondly, the used microlens array 6 still has map aliasing in the remaining spectral regions, and the spatial resolution is not substantially improved. Moreover, due to the limitation of the spectral range of the narrow-band filter, the spectral resolution will be reduced instead. At the same time, the microlens The array process is complex and difficult to process

Third, the reflective grating 5 in the optical path is a planar grating, which will cause spectral line bending and color distortion problems

Images