Infrared dual-waveband common-aperture refraction and reflection imaging system

Abstract

The invention discloses an infrared dual-waveband common-aperture refraction and reflection imaging system which is used for imaging target radiation of medium-wave spectral wavebands and long-wave spectral wavebands at infinite positions on a long-wave infrared detector and a medium-wave infrared detector. The infrared dual-waveband common-aperture refraction and reflection imaging system is characterized in that a main optical path is a long-wave infrared optical path, a reflex optical path is a medium-wave infrared optical path, the main optical path comprises a primary mirror, a secondary mirror, a first collimating mirror, a second collimating mirror, a beam splitter mirror, a first long-wave correcting mirror, an optical filter, a second long-wave correcting mirror, a third long-wave correcting mirror, a fourth long-wave correcting mirror, a fifth long-wave correcting mirror and a long-wave detector assembly which are sequentially arranged from a beam incidence direction, and the reflex optical path comprises the primary mirror, the secondary mirror, the first collimating mirror, the second collimating mirror, the beam splitter mirror, a first medium-wave correcting mirror, a second medium-wave correcting mirror, a third medium-wave correcting mirror, a medium-wave turning reflecting mirror, a fourth medium-wave correcting mirror, a fifth medium-wave correcting mirror and a medium-wave detector assembly. The infrared dual-waveband common-aperture refraction and reflection imaging system has the advantages of relatively compact structure, light weight, good imaging quality, capability of working in wide temperature ranges, and the like.

Description

technical field [0001] The invention relates to an infrared dual-band common-aperture catadioptric imaging system, which belongs to the field of optical applications. Background technique [0002] The infrared detection system detects and identifies the target by detecting the infrared radiation characteristics of the target. It has the advantages of passive detection, strong concealment, strong anti-interference, and can realize all-weather detection and search. Under adverse meteorological conditions such as poor visibility, it can penetrate the above-mentioned meteorological restrictions and identify and detect targets. At present, the most commonly used infrared detection systems are medium-wave infrared detection systems and long-wave infrared detection systems. Both have their own advantages. The infrared detection system has a higher transmittance in hot and humid atmospheric environments, while the long-wave infrared detection system has a higher transmittance in lan...

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Problems solved by technology

"Acta Optica Sinica" reported in the 6th issue of 2013 that Zhang Xinting, An Zhiyong and others designed a double-layer harmonic diffraction dual-band infrared athermalization optical system, using germanium and special AMTIR1 optical materials, and introducing double-layer harmonic diffraction elements to achieve The dual-band and athermal difference design is adopted. This system has the same problem as the infrared dual-color wide-band high-diffraction efficiency diffractive optical system.

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