Infrared double waveband confocal optical system

Abstract

The invention discloses an infrared double waveband confocal optical system. The system comprises a first lens assembly with positive focal power, a second lens assembly with positive focal power, a third lens assembly with negative focal power and a fourth lens assembly with positive focal power, wherein the first lens assembly, the second lens assembly, the third lens assembly and the fourth lens assembly are successively arranged; the second lens assembly is a humorous diffraction element, and the focal distance of the infrared double waveband confocal optical system is f; and the focal distance of the first lens assembly is f1, wherein f / f1 is more than 0.25 and is less than 0.76. The infrared double waveband confocal optical system provided by the invention utilizes the physical characteristic of the humorous diffraction element to realize multiband fusion of a confocal surface; the infrared double waveband confocal optical system is designed through optimizing the face type parameter of each surface and properly selecting the diffraction level of the humorous diffraction element, so that the system can correct the chromatism of a wide spectrum, picture quality of each wave band can achieve diffraction limit, and thus being beneficial for the miniaturization of the optical system; and the processing meets the technical requirement of common diamond lathe turning, and the manufacturing cost is reduced.

Description

technical field [0001] The invention relates to the field of optical technology, in particular to an infrared dual-band confocal optical system. Background technique [0002] With the development of camouflage technology, it is more and more difficult to detect and identify targets. The amount of information obtained by a single-band infrared detection system is limited, which cannot meet the requirements of high-resolution and real-time detection based on the complex background of modern reconnaissance and changing meteorological conditions. transmission needs. The medium- and long-wave dual-band detection can suppress the complex background and improve the detection and recognition effect of the target. [0003] The optical systems for early dual-band detection were mostly split-light or partly common-light systems. The optical design of the optical splitting system is complicated, the system volume is large, and the reliability is low. In the later stage of image fusio...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide an infrared dual-band confocal optical system to solve the problems of the prior art dual-band common optical path system with many chips, low transmittance, complex structure and high cost

Images