dmd spectral dimension coding dual optical path offner separation and combination light two-color infrared spectrum imaging device

Abstract

The invention discloses a DMD spectral dimension coding dual-optical path Offner splitting and combining light dual-color infrared spectral imaging device, which belongs to the technical field of infrared spectral imaging. All-weather working needs can not be met in the prior art. The device disclosed in the invention is characterized in that the back focal plane of a dual-color infrared achromatic zoom object lens group is coincident with the initial object plane of a dual-optical path Offner splitting and combining light system; the dual-optical path Offner splitting and combining light system is formed by a concave spherical mirror and a convex spherical reflective grating; the dual-color infrared achromatic zoom object lens group and a dual-color infrared DMD are symmetrical relative to the convex spherical reflective grating; the dual-color infrared DMD is located at an image plane of the dual-optical path Offner splitting and combining light system; a turning mirror is located ona secondary imaging optical path of the dual-optical path Offner splitting and combining light system; a dual-color infrared spectroscope is arranged in the reflecting optical path of the turning mirror; 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; the two detectors are connectedwith an image acquisition card respectively; and a computer is connected with the image acquisition card and the dual-color infrared DMD.

Description

technical field [0001] The invention relates to a DMD spectral dimension coding dual-optical-path Offner dual-color infrared spectral imaging device, which belongs to the technical field of infrared spectral imaging. Background technique [0002] Volume 33, Issue 7 of "Spectroscopy and Spectral Analysis" records a project entitled "Hadamard transform imaging spectroscopy system based on DMD design". The imaging spectrum system consists of a front mirror 1, a collimating mirror 2, a reflective grating 3, a converging mirror 4, a DMD5, a converging mirror 6, a reflective grating 7, a collimating mirror 8, and a detector 9, such as figure 1 shown. The front mirror 1 images the target scene on the primary image plane, and then the collimator mirror 2 shapes it into parallel light incident on the reflective grating 3, and the reflective grating 3 splits the incident light, and the spectral signal after splitting (that is, dispersion) After passing through the converging mirror ...

AI Technical Summary

Problems solved by technology

[0003] However, the optical system of the Hadamard transformation imaging spectroscopy system designed based on DMD has a complex and loose structure; the gratings used for light splitting and combining are all planar gratings, and planar gratings will cause spectral line bending and color distortion, resulting in spectral data The restoration error of the spectral imaging device reduces the spectral resolution of the spectral imaging device; moreover, the working band of the imaging spectral system is visible light, which cannot meet the needs of all-weather work

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