中国空间科学技术

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用蒙特卡罗法数值模拟CCD相机的杂光

王平阳,夏新林,谈和平   

  1. 哈尔滨工业大学
  • 发布日期:1999-04-25

Numerical Simulation of Stray Light in CCD Camera with the Monte Carlo Method

Wang Pingyang Xia Xinlin Tan Heping (Harbin Institute of Technology,Harbin 150001)   

  • Published:1999-04-25

摘要： 采用蒙特卡罗（Ｍｏｎｔｅ－Ｃａｒｌｏ）法对卫星ＣＣＤ相机的地气杂光进行了计算。主体段杂光系数的计算值与用积分球实验测量值属同一数量级，表明该方法和计算软件具有一定的可靠性；分析计算值与测量值产生偏差的因素发现，热物性参数的不确定性对数值模拟影响很大。分析了遮光罩长度、反光镜扫描角度等变化对杂光系数的影响，结果表明，遮光罩长度不变，而反光镜的扫描角度为４５°时，光线的进入比例最大，而杂光系数最小。

关键词: 蒙特卡罗法, CCD摄影机, 杂散光, 数值仿真, 分析

Abstract: The stray light level in CCD camera is calculated with the Monte Carlo method.The comparison of the stray light coefficient of the main section from the present study with that from the experiments using integral sphere shows both the results are of the same order of magnitude.It also shows that the method and software in this paper are reliable to a certain extent.The factors causing the dissent between the calculated result and the experiment value are analyzed.So it can be said that the effect of thermophysical property parameters on the numerical simulation is significant.The analysis included the effects of the length of sunshade and the angle of reflective mirror on the stray light coefficient.The result shows that if the length of sunshade is kept unchanged,the stray light coefficient arrives at minimum and the light entry proportion is the maximum when the scan angle is 45°