空气洁净度对点源透射比测试准确度的影响

为了进一步提高点源透射比测试准确度, 明确点源透射比测试环境需求, 提出了一种定量分析空气洁净度对点源透射比测试准确度影响的方法.该方法以Mie散射理论为基础, 采用蒙特卡洛模拟方法, 对空气中尘埃的尺寸和数量进行随机模拟, 得到不同空气洁净度等级下空气中尘埃对点源透射比测试准确度的影响.以直径为800 mm、点源透射比设计值为10－9量级的某太空望远镜为例进行定量分析, 结果表明: 为了满足该空间光学系统的点源透射比测试需求, 空气洁净度等级应优于ISO class 6, 此时空气中尘埃引起的点源透射比测试误差约为10－10量级;ISO class每升高一级, 测试误差约增大10倍.

Abstract

In order to further improve the precision and quantify the environmental requirement for Point Source Transmittance(PST) test, a method was proposed to quantitatively analyze the impact of air cleanliness on the precision of PST test. This method is based on Mie scatter theory, and uses Monte Carlo simulation to perform a random and large simulation on dust quantity and size for different air cleanness. A case study was performed to find out the actual environmental requirement for PST test, which used a space telescope of 800mm diameter with the designed PST of 10－9. The analysis indicates a minimum air cleanness of ISO class 6 and the PST test error of 10－10 caused by dust, with each additional level of air cleanness, the PST test error will increase ten times.

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曹智睿, 付跃刚, 田浩. 空气洁净度对点源透射比测试准确度的影响[J]. 光子学报, 2016, 45(1): 0112002. CAO Zhi-rui, FU Yue-gang, TIAN Hao. The Impact for the Air Cleanliness to the Precision of PST Test[J]. ACTA PHOTONICA SINICA, 2016, 45(1): 0112002.

空气洁净度对点源透射比测试准确度的影响

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