Achromatic infrared lens with focal length of 35mm and assembly method and imaging method thereof

Abstract

The invention discloses an athermalization infrared lens with a focal length of 35 mm and an assembling method and an imaging method thereof. The lens comprises a lens barrel, and a first meniscus lens, a second meniscus lens, a third meniscus lens and a fourth biconvex lens which are sequentially arranged in the lens barrel from left to right in the light transmission direction. The convex surfaces of the first meniscus lens, the second meniscus lens and the third meniscus lens all face the object side; the focal power of the first meniscus lens is positive, the focal power of the second meniscus lens is negative, and the focal power of the third meniscus lens is negative. According to the athermalization infrared lens, an optical passive compensation technology is applied, so that the lens can keep imaging consistency in a working environment with wide temperature fluctuation. Through reasonable focal power ratio and lens materials, a good optical passive athermalization effect can be achieved only by adopting a four-piece type lens structure, and the optical passive athermalization lens has a good imaging effect within the wave band of 8-12 microns and the temperature range of-40 DEG C to 80 DEG C, and is particularly suitable for 1280 * 1024 12 microns type detectors.

Description

technical field [0001] The invention belongs to the technical field of optical lenses, and relates to an athermal infrared lens with a focal length of 35 mm, an assembly method and an imaging method thereof. Background technique [0002] With the development of science and technology, infrared imaging technology has been widely used in national defense, industry, medical and other fields. Infrared detection has a certain ability to penetrate smoke, fog, haze, snow, etc. and the ability to identify camouflage. It is not blinded by strong light and flash interference on the battlefield. It can realize long-distance and all-weather observation, especially suitable for night and bad weather conditions. Target detection below. However, in the application of infrared imaging, the temperature of the external environment will affect the refractive index of the lens material, and will also cause thermal expansion and contraction of the lens barrel material, resulting in a change in ...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the above-mentioned problems in the prior art, the present invention proposes an adiabatic infrared lens, which can effectively overcome the problem of poor imaging performance caused by external temperature fluctuations, while meeting a wide operating temperature range, the number of lenses is small and the structure is simple

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