26 November 2012 Stray light analysis of a space patrol
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Abstract
The stray light of a space patrol is analyzed in this paper. The space patrol is used to observe the Earth in space. In the paper the definitions of stray lights in the optical system are introduced and the stray lights are classified based on their sources. After the analyzing the serious harm situations of the stray lights in the optical system is presented. Software Tracepro is used in analysis of stray light. The model of the space patrol is established in the software and stray light simulation and analysis of the space patrol are presented based on the evaluation criterion of maximum irradiance value. Three different situations are discussed. First, sunlight directly irradiates onto the sensitive surface of the detector; second, sunlight enters the system by the reflections of the space patrol’s body; and finally sunlight reflecting from the moon’s surface irradiates onto the sensitive surface of detector by the reflection of the space patrol’s body. In each situation, we respectively calculate different elevation angles in ranges between 15°~45° by the ray tracing method in the solar azimuth of 0° and 30°. Transmission paths of stray lights are obtained by ray tracing data in different circumstances and the important surfaces of the system are found out. Finally, some corresponding stray light suppression measures which can help to reduce harm of stray light are proposed.
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Li Lin, Li Lin, Huiyi Chen, Huiyi Chen, } "Stray light analysis of a space patrol", Proc. SPIE 8557, Optical Design and Testing V, 85572G (26 November 2012); doi: 10.1117/12.999346; https://doi.org/10.1117/12.999346
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