Optics and Precision Engineering, Volume. 30, Issue 17, 2050(2022)

Optical system and stray light suppression of Lyot coronagraph

Jinpeng CHI1...2, Hongxin ZHANG1,*, Xiaodong WANG1, Qingyu MENG1, Zichang QIN1,2, Yunhui LI1, Taisheng WANG1 and Fengyou Li1 |Show fewer author(s)
Author Affiliations
  • 1Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun30033, China
  • 2University of Chinese Academy of Sciences, Beijing100049, China
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    The Io plasma torus is the most densest and most widely studied region of Jupiter's magnetosphere. To meet observe the Io plasma torus observation, a Lyot Coronagraph was installed in the planet's atmosphere spectrum telescope to meet the needs of imaging observation of Io plasma torus capture the emissive spectrum. The parameters of the instrument were determined according to the radiation characteristics of the Jupiter and the parameters of PAST. Then, the initial structure was optimized. The imaging performance of the system was analyzed, and the MTF value at 37 lp/mm is above 0.6 that meet the design specification. Considering the character of stray light in system, a structure system for suppressing stray light was built considering the characteristics of stray light. The level of stray light in the system was measured in a class 1 000 cleanroom. The experimental results show that the main sources of stray light can be suppressed entirely, and the stray light suppression level of the system is equal to 10-5 at 2.5Rj, which satisfies the system requirements for observing Io plasma torus.

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    Jinpeng CHI, Hongxin ZHANG, Xiaodong WANG, Qingyu MENG, Zichang QIN, Yunhui LI, Taisheng WANG, Fengyou Li. Optical system and stray light suppression of Lyot coronagraph[J]. Optics and Precision Engineering, 2022, 30(17): 2050

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    Paper Information

    Category: Modern Applied Optics

    Received: Jan. 26, 2022

    Accepted: --

    Published Online: Oct. 20, 2022

    The Author Email: ZHANG Hongxin (firsthongxin@163.com)

    DOI:10.37188/OPE.20223017.2050

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