红外搜索跟踪系统中的双波段共孔径光学设计

Dual-band Common Aperture Optical Design of Infrared Search Track System

由于红外搜索跟踪系统（IRST）探测距离长,伪装性良好和错误率低等特点,因此成为了空中及海上最好的探测装备。针对红外与搜索跟踪系统对多谱段的需求,设计了红外搜索跟踪双波段共孔径光学系统。具有优于单波段获取信息弱的优势,将中波红外图像和长波红外图像融合到一起,综合利用了中波红外和长波红外各自优点,提高了有效侦察率、降低虚警率。系统总焦距为400 mm,F#=2,视场角为2°,采用分光型RC系统实现3~5μm和8~12μm双波段共孔径清晰成像,为了抑制中波的热辐射杂光,对中波系统实现了二次成像。设计结果表明,系统像质优良,满足红外搜索跟踪系统的使用要求。

Infrared search and track（IRST） system with the characteristics of long detection range, good cam ouflage and low error rate becomes the best detection equipments in the air and on the sea. According to the multi spectral demand of IRST system, an IRST optical system with dual-band common aperture is designed. The system is better than the single-band system in the area of acquiring information. The obtained MWIR and LWIR images can be fused together so as to take the advantages of MWIR and LWIR synthetically. Effective reconnaissance prob ability is enhanced and false alarm probability is reduced. Total focal length of the system is 400 mm, F#=2 and field of view is 2°. The clear imaging in 3~5 μm and 8~12 μm with dual-band common aperture is realized by dis persive RC system. Second imaging is performed on a medium wave system for suppressing thermal radiation stray light from medium wave. Design result indicates that excellent quality images can be produced by the system and the operation requirements of IRST system can be met.