Two-wave-band infrared optical system

Abstract

The invention discloses a two-wave-band infrared optical system which comprises a first lens, a second lens, a third lens, diaphragm, a fourth lens, a fifth lens and a sixth lens which are coaxially arranged in sequence along the light incidence direction, wherein the first lens and the fifth lens are crescent negative lenses; the second lens, the third lens and the fourth lens are crescent positive lenses; the sixth lens is a biconvex lens; the rear surface of the third lens and the front surface of the fourth lens are nonspherical surfaces, and the surfaces of the other lenses are spherical surfaces; the first lens and the second lens are made from germanium; the third lens, the fourth lens and the sixth lens are made from chalcogenide glass; the fifth lens is made from zinc selenide. The system realizes two-wave-band imaging with the chalcogenide glass; meanwhile, the problem of correction of axial chromatic aberration and spherical aberration in medium and long bandwidth wave-band infrared optical system is solved, the identification efficiency of a target is improved, and the false alarm rate is reduced; the system is compact in structure and high in transmittance; an x ray machine is convenient to assemble and adjust; the two-wave-band infrared optical system is suitable for being popularized and applied.

Description

technical field [0001] The invention belongs to the technical field of optical systems, and in particular relates to a dual-band infrared optical system. Background technique [0002] Infrared imaging is based on the difference in irradiance between the target and the background. By passively receiving the radiation of the target and the background, the temperature distribution image of the target object is converted into a video image by means of photoelectric conversion and electrical signal processing. The absorption of infrared radiation by the atmosphere mainly has three important atmospheric windows, which are distributed in the three bands of near-infrared of 0.75-2.5 μm, mid-wave infrared of 3-5 μm and long-wave infrared of 8-14 μm. Traditional infrared imaging systems generally work in narrow bands, and the amount of information obtained is limited. However, combined with the imaging characteristics of each band, the infrared optical system working in multiple bands...

AI Technical Summary

Problems solved by technology

During the continuous zooming process of the dual-band optical system, the focal length difference corresponding to the dual-band is less than its focal depth, and the dual-band target information can be received by the same system without optical path switching; however, it can only use part of the common optical path system, which increases the system volume, weight and dimensions

If a detector common optical path system that can respond to two wavebands is used, the existing technology cannot overcome the correction problem of aberration and chromatic aberration of the optical system

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