Infrared telephoto optical system

Abstract

The invention relates to the infrared telephoto objective lens field and relates to an infrared telephoto optical system. The infrared telephoto optical system includes a first lens, a second lens, a third lens and a fourth lens; the first lens is a crescent spherical negative lens; the surface of the object side of the first lens is a convex surface, and the surface of the other side of the first lens is a concave surface; the second lens is a positive lens; one side of the second lens is adjacent to the concave surface of the first lens, and the surface of the other side of the second lens is a concave surface; the third lens is a spherical negative lens; the surface of the light incoming side of the third lens is a convex surface, and the surface of the other side of the third lens is a concave surface; the fourth lens is a negative lens; and the surface of the light incoming side of the fourth lens is a convex surface, and the surface of the other side of the fourth lens is a concave surface. According to the infrared telephoto optical system of the invention, the high-level aberration and chromatic aberration of the telephoto objective lens can be corrected, imaging quality is improved, and the length of the system is effectively shortened. The infrared telephoto optical system has the advantages of stable image and high image quality.

Description

technical field [0001] The field of the infrared telephoto objective lens of the present invention is specifically an infrared telephoto optical system. Background technique [0002] In recent years, infrared imaging technology has become one of the development directions of target detection technology, and low-cost uncooled thermal imaging technology has also developed along with infrared thermal imaging technology. Uncooled detectors have the advantages of good stability, low power consumption, and small size, but their noise equivalent temperature difference (NETD) is relatively high. Research on large relative aperture infrared optical system can overcome the shortcoming of low sensitivity of long-wave infrared uncooled detectors. The infrared imaging optical system is obviously affected by temperature changes, and the imaging quality of the optical system at different temperatures has a greater impact on target detection. Changes in the temperature of the operating en...

AI Technical Summary

Problems solved by technology

Infrared materials have a large temperature coefficient of refractive index, which is much larger than that of visible light materials, which can cause image plane drift

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