Chen Shuaishuai, Niu Xinhua
Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, China.
Key Laboratory of Infrared Detecting & Imaging Technology, Chinese Academy of Science, Shanghai 200083, China.
Sensors (Basel). 2023 Sep 2;23(17):7625. doi: 10.3390/s23177625.
As the non-imaging light of optical instruments, stray light has an important impact on normal imaging and data quantification applications. The FY-3D Medium Resolution Spectral Imager (MERSI) operates in a sun-synchronous orbit, with a scanning field of view of 110° and a surface imaging width of more than 2300 km, which can complete two coverage observations of global targets per day with high detection efficiency. According to the characteristics of the operating orbit and large-angle scanning imaging of MERSI, a stray light radiation model of the polar-orbiting spectrometer is constructed, and the design requirements of stray light suppression are proposed. Using the point source transmittance (PST) as the merit function of the stray light analysis method, the instrument was simulated with all stray light suppression optical paths, and the effectiveness of stray light elimination measures was verified using the stray light test. In this paper, the full-link method of "orbital stray light radiation model-system, internal and external simulation design-system analysis and actual test comparison verification" is proposed, and there is a maximum decrease in the system's PST by about 10 times after applying the stray light suppression's optimization design, which can provide a general method for stray light suppression designs for polar-orbit spectral imagers.
作为光学仪器的非成像光，杂散光对正常成像和数据定量应用有重要影响。风云三号D星中等分辨率光谱成像仪（MERSI）运行在太阳同步轨道，扫描视场为110°，地面成像宽度超过2300千米，每天可对全球目标完成两次覆盖观测，探测效率高。根据MERSI运行轨道和大角度扫描成像特点，构建了极轨光谱仪杂散光辐射模型，提出了杂散光抑制设计要求。采用点源透过率（PST）作为杂散光分析方法的评价函数，对仪器全杂散光抑制光路进行了模拟，并通过杂散光测试验证了杂散光消除措施的有效性。本文提出了“轨道杂散光辐射模型-系统内外部模拟设计-系统分析及实际测试对比验证”的全链路方法，应用杂散光抑制优化设计后系统PST最大下降约10倍，可为极轨光谱成像仪杂散光抑制设计提供通用方法。
