透射式双波段红外搜索跟踪系统光学物镜

摘要

A dual spectral band(MWIR/LWIR)refractive objective lens used for Infrared Search and Track(IRST) system is given in this paper. The spectral bands are 3.7～4.8μm and 7.5～10.5μm respectively and the relative aperture is 1/1.3 for both spectral bands, and the field of view for the lens is ±1.75°. In order to improve the optical transparency, a splitter in convergent beam is used, and there are only 4 lenses with 2 refractive/diffractive surfaces in each spectral band. The optical transparency is tested over 70% (include beam splitter) in each band.%给出了一种适用于红外搜索跟踪系统的透射式双波段(中波/长波)光学物镜,两个波段的相对口径均为1/1.3,工作波段分别为3.7～4.8μm和7.5～10.5μm,视场为±1.75°.为提高光学透过率,物镜采用会聚光路分光,每个波段仅有4片透镜,其中各有2片采用了衍射光学表面,实测两个波段的光学透过率(含分光镜)均大于70%.