A cooling type mid-wave infrared athermalization optical lens

Abstract

The invention provides a cooling-type mid-wave infrared athermalization optical lens, which solves the athermalization design of the existing optical system, which has problems of large volume, heavy mass, and low reliability; or relatively complex structure, small field of view, and poor imaging Issues with poorer quality. The lens includes a lens barrel and a mid-wave infrared optical system arranged in the lens barrel. The mid-wave infrared optical system includes a first lens, a second lens, a third lens and a fourth lens arranged coaxially in sequence from the object plane to the image plane ;The material of the lens barrel is aluminum; the first lens is a meniscus silicon lens with a positive power that bends toward the image side; the second lens is a double-concave germanium lens with a negative power; the third lens is a positive power that bends toward The meniscus silicon lens on the object side; the fourth lens is a biconvex zinc selenide lens with positive refractive power; the light incident surface of the lens is defined as the front surface, and the light exit surface is the rear surface; the front surface of the second lens, the Both the rear surface and the front surface of the fourth lens are high-order aspheric surfaces.

Description

technical field [0001] The invention relates to a mid-wave infrared optical lens, in particular to a cooling type mid-wave infrared athermalization optical lens. Background technique [0002] Infrared imaging technology has played an irreplaceable role in aerospace, security search and rescue, industrial production and other fields. Strong environmental adaptability and compact structure are its development direction. Due to the large temperature coefficient of refractive index of infrared optical materials, changes in ambient temperature will cause changes in the focal length, image plane position and aberration of the infrared optical system, resulting in a decrease in imaging quality. In order to work in an environment with wide temperature changes and obtain better imaging quality, the research and design of athermal difference is very necessary. The athermalization design of the optical system refers to the elimination of the thermal aberration caused by temperature to...

AI Technical Summary

Problems solved by technology

[0006] In order to solve the technical problems of large volume, heavy mass, low reliability, or relatively complex structure, small field of view, many types of materials, high manufacturing cost, and poor imaging quality in the existing athermal design of the optical system, this The invention provides a cooling type mid-wave infrared athermalization optical lens

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