DMD spatial dimension coding symmetric Offner dispersive dual-color infrared spectral imaging device

Abstract

The invention discloses a DMD spatial dimension coding symmetric Offner dispersive dual-color infrared spectral imaging device, which belongs to the technical field of infrared spectral imaging. All-weather w spectral imaging needs can not be met in the prior art. The DMD spatial dimension coding symmetric Offner dispersive dual-color infrared spectral imaging device is characterized in that the working plane of a dual-color infrared DMD is located at an image plane of a dual-color infrared achromatic zoom object lens group; the object plane of a symmetric Offner dispersive system is coincident with the image plane of the dual-color infrared achromatic zoom object lens group; in the symmetric Offner dispersive system, a spherical reflector and a spherical reflective grating have the same curvature center; a dual-color infrared spectroscope is arranged in an emergent light path of the symmetric Offner dispersive system and an angle of 45 DEG is formed with the light axis of the light path; two splitting light paths of the dual-color infrared spectroscope are provided with a refrigerated medium wave infrared detector and a long wave infrared detector; light-sensitive planes of the refrigerated medium wave infrared detector and the long wave infrared detector are located on the image plane of the symmetric Offner dispersive system; the two detectors are connected with an image acquisition card respectively; the image acquisition card, a computer and the dual-color infrared DMD are sequentially connected; and the dual-color infrared light refers to 3 to 5 mum and 8 to 14 mum.

Description

technical field [0001] The invention relates to a DMD space-dimensional coding symmetric Offner dispersion two-color 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 needs of all-weather work

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