R-C系统中由表面散射引起的视场内杂散光分布

推导了R-C系统焦平面上由主镜和次镜表面散射引起的视场内杂散光分布的近似解析表达式.针对典型R-C系统的视场内杂散光分布,由近似表达式得到的计算结果与利用商业光学仿真软件得到的模拟结果具有较好的一致性,说明了近似表达式的正确性.与焦平面上无像差衍射光分布相比较,可以方便地分析强光入射时R-C系统焦平面上不同区域的饱和机制.研究结果表明,对于典型的R-C系统,探测器表面上以几何像点为中心,半径为2.5mm的范围内,衍射光是引起探测器饱和的主要因素；在此范围外,表面散射造成探测器的饱和.该结果为进一步研究强光饱和实验,解释有关现象提供理论分析基础.

In-field stray light distribution caused by the surface scattering in ritchey-chretien systems

The analytic expressions for the scattered distributions at the focal plane of the Ritchey-Chretien reflective system(R-C system) from the primary mirror and the second mirror were derived.Aiming at the scattered distribution in a typical R-C system,the excellent agreement of the computing results according to the formula introduced in this study with the simulating results provided by the commercial optical analysis software shows that the formula derived is believable and reasonable.Compared with the diffracted distribution at the focal plane,it is more convenient to analyze the saturated effects at the focal plane of the system irradiated by intense light.The results indicate that in the typical R-C system,diffraction is the dominant factor of the saturating effect inside 2.5mm,while surface scattering saturates the detector outside this range.This result provides a theoretical basis for the further study of intense light induced saturating effects in optical system.