Infrared double-waveband athermalization optical lens

Abstract

The invention discloses an infrared double-waveband athermalization optical lens, which is characterized in that working wavebands are 3-5 microns and 8-12 microns and a working ambient temperature range is from -60 DEG C to 80 DEG C. The lens is of a common optical axis Cooke triplet structure and comprises four refractor lens; an aperture diaphragm is arranged at a cold screen of an image surface; in the incidence direction of light, the back surface of a first lens [1] and the front surface of a third lens [3] are aspheric surfaces; the materials of lens are germanium, zinc selenide, zinc sulfide and zinc selenide in sequence; and when the lens focus is normalized, the value range of focal power is as follows: Phi 1 is more than or equal to -1.0 but less than or equal to -0.5, Phi 2 is more than or equal to 1.50 but less than or equal to 2.0, Phi 3 is more than or equal to -2.0 but less than or equal to -1.50, and Phi 4 is more than or equal to 1.0 but less than or equal to 1.5. The optical lens has the advantages that the structure is simple, the imaging quality is high, the athermalization effect is good, the later working distance is long, the cold aperture diaphragm efficiency is 100%, and the like. The infrared double-waveband athermalization optical lens can be used as an infrared double-color guiding head and has wide application prospect in both military and civil fields.

Description

technical field [0001] The invention relates to an infrared optical lens working in the middle wave and long wave bands, in particular to an optical lens working in the 3-5μm and 8-12μm wavebands and adiabatic, which can be used in the environment of -60°C to +80°C imaging over a temperature range. Background technique [0002] Infrared imaging is based on the difference in irradiance between the target and the background. According to Planck’s blackbody radiation law, the medium-wave infrared with a wavelength of 3-5 μm is mainly used to observe high-temperature events, and the long-wave infrared with a wavelength of 8-12 μm is used to detect the contours of objects at room temperature. The imaging characteristics of the two bands can improve the detection and identification capabilities of targets. Detector arrays sensitive to these two infrared bands include dual-band mercury cadmium telluride focal plane arrays and quantum well infrared photodetector arrays, and now the...

AI Technical Summary

Problems solved by technology

At present, the use of optical passive athermalization method to provide an optical lens that works in the dual bands of medium-wave and long-wave infrared has not been reported.

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