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Research on Stray-Light Suppression Method for Large Off-Axis Three-Mirror Anastigmatic Space Camera.

Lei Wei1, Lin Yang1, Yuan-Peng Fan1

  • 1Institute of Frontier and Interdisciplinary Science, Shandong University, Qingdao 266237, China.

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|July 9, 2022
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Summary

This study introduces a composite stray-light suppression strategy for space cameras, significantly reducing stray light and improving image quality. The novel approach enhances optical system performance through advanced baffling and light barrier design.

Keywords:
baffleoff-axis TMA space camerapoint source transmittance (PST)scattering modelstray-light suppressionveiling glare index (VGI)

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Area of Science:

  • Optical Engineering
  • Space Systems Engineering
  • Image Science

Background:

  • Stray-light suppression is critical for large off-axis three-mirror anastigmatic space cameras.
  • Existing stray-light analysis models have limitations for large, rough surfaces.

Purpose of the Study:

  • To develop and validate a composite stray-light suppression strategy for space cameras.
  • To propose an adaptable stray-light analysis model for large mirrors.

Main Methods:

  • Implemented a composite strategy using baffles, retaining rings, and internal measures.
  • Designed a three-layered light barrier for the third mirror.
  • Developed a wide-adaptability stray-light analysis model.
  • Conducted simulations and experimental tests in a vacuum environment.

Main Results:

  • Achieved point source transmittance of 10⁻⁵ before the light barrier, reducing to 10⁻⁸ after.
  • Reduced veiling glare index from <5.8% to <1.31% across the field of view.
  • Demonstrated minimal impact (<3.6%) on modulation transfer function.
  • Verified clear imaging with SNR reaching 80 dB in out-of-field tests.

Conclusions:

  • The proposed composite stray-light suppression strategy is highly effective for large off-axis space cameras.
  • The new analysis model enhances stray-light simulation accuracy for large, rough mirrors.
  • Experimental validation confirms the system's performance and minimal impact on optical quality.