Laser and middle- and long-wavelength infrared common-aperture three-band imaging system

Abstract

The invention relates to a laser and middle- and long-wavelength infrared common-aperture three-band imaging system, which comprises an entrance pupil shared by each band, a primary mirror, a secondary convex mirror, a middle/long-wavelength infrared optical path imaging lens group, a laser converging light spot receiving unit, a middle- and long-wavelength infrared band beam splitter, a middle- and long-wavelength infrared dual-band imaging lens group and a detection image surface, wherein the reflection surface of the primary mirror is a concave surface, and a hole is formed in the center of the primary mirror. The system can be used for realizing the common-aperture collection of scene infrared radiation energy of the same object and laser echo energy reflected by the object; and the entrance pupil is positioned in front of the primary mirror, the secondary mirror is used for the beam splitting of laser and middle- and long-wavelength infrared bands, and a dichroic mirror is inclined to split middle-wavelength infrared light and long-wavelength infrared light, so that the system is compact in structure, the utilization rates of optical energy and space of the system are increased, the aberration correction and beam focusing of middle- and long-wavelength infrared bands are facilitated respectively, and the imaging quality is remarkably improved.

Description

technical field [0001] The invention relates to a three-band imaging system with a common aperture of laser and medium- and long-wave infrared, which is especially suitable for infrared guidance systems such as searching, tracking and capturing of targets by infrared imaging seekers. Background technique [0002] Compared with the traditional single-band non-common-aperture optical system, the three-band common-aperture imaging optical system, on the one hand, improves the accuracy of target search and tracking in complex environmental backgrounds; on the other hand, the common-aperture The system is equivalent to three independent optical imaging systems. The front-end part of the system is shared by the three optical paths of laser, medium-wave infrared and long-wave infrared, which effectively saves the use of optical components and improves the utilization of components. Reduced costs. With the development of infrared imaging technology, single infrared band imaging has...

AI Technical Summary

Problems solved by technology

However, at present, the research on the multi-band common-aperture system involving laser and infrared bands is still immature, and there are still many problems: the design of the common part of the front-end of the three-band common-aperture imaging system should consider laser, medium-wave, and long-wave infrared imaging at the same time The converging spot size and aberration correction of the optical path are difficult to design; the matching of the cold diaphragm in the medium and long-wave infrared band imaging optical path, because the two optical paths share the same part of the front end of the system, and also share the same entrance pupil, realize the simultaneous integration of the two optical paths It is difficult to match the cold diaphragm 100%; since the system includes three optical paths, the common part of the front end of the system and the optical path after the split optical path of the system need to be installed separately, and its processing and adjustment are also difficult

At present, under the condition of the single-band detection accuracy of the target background, the existing single infrared band imaging system can hardly meet the accuracy requirements of the infrared guidance device for the search and tracking of the target in the complex background; at the same time, the infrared band imaging in the working process , there is an influence of temperature on the imaging quality of the system

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