摘要
与一般光学系统相比,航空遥感光学系统具有长焦距、大口径、宽波段等特点。因此,广泛使用反射式光学系统。常见的离轴三反系统已不能满足系统小型化、轻量化的要求。介绍了一种无中心遮拦的离轴四反射镜系统,由离轴三反系统改进而成,结构更加紧凑。带一次中间像面的离轴三反系统的中间像位于次镜和三镜之间,为了进一步折叠光路,在中间像面处加入球面反射场镜,从而成为离轴四反。分析了离轴四反的设计步骤,设计了一个焦距为1 200 mm,视场为0.8°×0.8,°相对孔径为F/6的光学系统,系统总长只有300 mm,并达到很好的光学性能,具有长焦距、小尺寸、良好的杂散光抑制能力等特点。
Optical system used in aerospace remote sensing usually has long focal length, large aperture, wide spectrum compared with common optical systems. So the reflective optical system is widely used. Three-mirror anastigmat can not meet the requirement of reducing weight and compacting size in some circumstances. A unobstructed four-mirror anastigmat system was proposed, which was modified based on three-mirror anastigmat and had compacter structure. Intermediate image of three-mirror anastigmat having two image surfaces was between secondary and tertiary mirror. In order to fold the optical path, four-mirror anastigmat was designed by adding the .spherical reflective mirror at intermediate image. The design of four-mirror anastigmat was analyzed, then a system with effective focal length of 1 200 mm and field of view of 0.8~x0.8~ was designed , total length and f-number are 300 mm and F/6,respectively.The system has advantages of long focal length, relative short physical size and excellent ability in restraining stray lights.
出处
《红外与激光工程》
EI
CSCD
北大核心
2008年第2期319-321,共3页
Infrared and Laser Engineering
基金
中国科学院上海技术物理研究所三期创新资助项目(C1-3)
关键词
遥感光学
离轴四反
反射系统
Remote sensing optical system
Four-mirror-reflective anastigmat
Reflect system
