Infrared dual-waveband wide-angle athermalization confocal-plane optical system

Abstract

The invention discloses an infrared dual-band wide-angle athermalization confocal-plane optical system, which comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens which are sequentially arranged along an optical path. After the focal power of the first lens, the focal power of the second lens, the focal power of the third lens, the focal power of the fourth lens, the focal power of the fifth lens and the focal power of the sixth lens are normalized relative to the focal length of the optical system, the following relations are met: -1 < = phi1 < = -0.5, 0 < = phi2 < = 0.5, -0.5 < = phi3 < = 0, 0 < = phi4 < = 0.5, -0.5 < = phi5 < = 0, and 0 < = phi6 < = 0.5. The F number of the optical system satisfies 1.5 < = F < = 2; the half-field angle w of the optical system is greater than or equal to 120 degrees and less than or equal to 140 degrees; and the image surface radius r of the optical system is greater than or equal to 12.3 mm. A common-optical-path and common-focal-plane mode is adopted, and the system has the advantages of small size, low cost, high transmittance and the like. And meanwhile, the technical effect of passive athermalization can be achieved by matching with selection of lens materials.

Description

technical field [0001] The invention relates to the field of optical technology, in particular to an infrared dual-band wide-angle athermal difference confocal surface optical system. Background technique [0002] At present, the forms of infrared dual-band imaging are mainly divided into three types: split optical path, partial common optical path, and common optical path. The split optical path and partial common optical path have a large number of lenses and large volume, which is not conducive to product application. [0003] Whether an infrared thermal imaging system can detect and identify targets not only depends on the performance of the system itself, but also is closely related to the radiation characteristics of the scene. The radiation characteristics of different targets, and the radiation characteristics of the same target at different temperatures are different, and their radiation intensities in mid-wave infrared and long-wave infrared are very different. In...

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Problems solved by technology

[0006] An embodiment of the present invention provides an infrared dual-band wide-angle athermalization confocal surface optical system to solve the problems of complex structure, low reliability, low transmittance, and small working range in existing dual-band imaging

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