红外光学系统杂光PST的研究与测试

POINT SOURCE TRANSMITTANCE OF STRAY LIGHT OF INFRARED OPTICAL SYSTEMS AND ITS MEASUREMENTS

介绍了表征光学系统抑制水平的定量指标——点源透过率ＰＳＴ．提出了红外光学系统杂光指标ＰＳＴ的一种测试方法，并在１０．６μｍ波长处，测试了口径为１８０ｍｍ的全反射Ｒｉｔｃｈｅｙ－Ｃｈｒｅｔｉｅｎ红外系统在不同入射角时的点源透过率ＰＳＴ（θ）．

A quantitative specification of stray light suppression Point Source Transmittance ( PST ) for infrared optical systems was introduced. A testing method for PST was presented. Using the method described in this paper, PST(θ) of an all reflective Ritchey Chretien infrared system with the entrance pupil diameter of 180mm for various incident angels of off axis stray light source was obtained at the wavelength λ =10.6μm.