26 November 2012 Compact optical imaging system for star tracker with long focal length and perfect thermal adaptability
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Abstract
A star tracker optical imaging system is designed for Polaris detection. System parameters determination and its configuration chosen method are given. Based on Macsutov-Cassegrain configuration, the system is designed imagery tele-centric. It works at 0.6μm~1.1μm waveband and the view field is 0.5 degree. The tube length of the system is 80mm, which is only 8 percent of its focal length. Its MTF reaches diffraction limit and the spot diagrams are quit near a circle. About 80% of the energy is encircled in a CCD pixel. And the distortion is less than 1%. Moreover, it has a perfect thermal adaptability from -40℃ to 60℃.
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Yiqun Ji, Yiqun Ji, Rongbao Shi, Rongbao Shi, Hucheng He, Hucheng He, Li Xu, Li Xu, Xuxia Liu, Xuxia Liu, Yangming Jin, Yangming Jin, Weimin Shen, Weimin Shen, "Compact optical imaging system for star tracker with long focal length and perfect thermal adaptability", Proc. SPIE 8557, Optical Design and Testing V, 855719 (26 November 2012); doi: 10.1117/12.999395; https://doi.org/10.1117/12.999395
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