Visible light/long-wave infrared broad band spectrum joint focusing optical imaging system

Abstract

The invention discloses a visible light / long-wave infrared broad band spectrum joint focusing optical imaging system comprises a broad spectrum focusing window, a color separation film, a long wave infrared lens group and a visible light lens group. The color separation film and a horizontal optical axis form an angle of 45 degrees, and light incoming from the broad spectrum focusing window passes through the color separation film and the visible light lens group to image on a visible light sensor. The long wave infrared lens group is composed of a first lens, a second lens, a reflector and athird lens from an object space to an image space in sequence, the reflector is parallel to the color separation film, and infrared light in broad spectrum light passes through the color separation film and the long wave infrared lens group to image on a non-refrigeration detector. A first face of the second lens is a binary surface, a second face of the third lens is an aspheric surface, and systematic heat difference and optical aberration are removed through the design of the binary surface and the aspheric surface. The visible light / long-wave infrared broad band spectrum joint focusing optical imaging system can solve the problem that a single wave band is not high in detection accuracy, two wavebands and two lenses have optical parallax on imaging, two wavebands are big in imaging aberration, an infrared system has heat difference, and two wavebands need focusing mutually.

Description

technical field [0001] The invention belongs to a dual-band fusion thermal imaging system, and specifically relates to a wide-band confocal optical imaging system capable of dual-band imaging at 0.6 μm to 0.8 μm and 8 μm to 12 μm at the same time, which is mainly used in hand-held target detection and recognition systems . Background technique [0002] In recent years, with the rapid development of photoelectric imaging equipment, the camouflage technology of military targets has also continued to improve, resulting in the weakening of the information that can be detected by traditional single-band equipment, and the decline in target recognition rate, which can no longer meet the needs of military target detection. The optoelectronic imaging system based on dual-band has become a research hotspot at home and abroad. [0003] Due to the different imaging mechanisms of visible light and infrared detectors, the target characteristic information reflected by the two is also di...

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Problems solved by technology

[0004] In view of this, the present invention provides a visible / long-wave infrared (VIS / LWIR) wide-band confocal optical imaging system, which solves the problem of low detection accuracy of a single band, parallax in dual-band and dual-lens imaging, visible light / long-wave Infrared dual-band imaging has large aberrations, thermal differences in the infrared system, and dual-band common focusing problems

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