典型星载遥感器光学系统总剂量效应防护方法与设计

针对空间不连续工作的典型星载光学遥感器的结构和光学系统,进行抗辐射薄弱环节与总剂量效应的仿真分析计算,提出在遥感器入光口遮光罩处增加防护盖以降低光学系统中辐射吸收剂量预示最大位置处的吸收剂量,并对防护盖的具体参数进行仿真优化设计。研究表明:光学系统各光学部件所在位置辐射吸收剂量处于不均匀状态,接收地物信息的第一镜体处的预示值最大;安装防护盖后,可大幅降低该处的辐射吸收剂量,使之与其他部位的吸收剂量处于同一量级水平;防护盖的实施参数以厚度1~3 mm、距离入光口遮光罩端部小于20 mm为最佳。文章最后描述了防护盖设计方法的通用性,给出了防护盖的适用技术条件。

Protection method for total dose effect on the optical system of typical satellite remote sensor and related design

In view of the structure and the optical system of the typical satellite remote sensor working intermittently in space, the paper analyzes the weak link of the optical system with regard to the radiation protection. Based on the simulation analysis of the total dose on the optical system, an approach of adding a protective cover at the baffle''s entrance is proposed to reduce the absorbed radiation dose where the largest dose is predicted, and the design of the protective cover is optimized through the simulation. It is shown that the radiation dose on the optical element is in a non-uniform distribution at different positions of the remote sensor, and the radiation dose on the first mirror used for receiving the object information is the largest. After installing the protective cover, the absorbed dose is decreased remarkably to a similar order of magnitude as that on the other parts. The protective cover has the best effect when it is 1 to 3 mm in thickness, and less than 20 mm away from the baffle''s entrance. This method of the radiation protection can be widely applied with practical technical specifications.