Add to BibSonomy
Abstract
The ultralight space mirror has long been a hot topic in the research field of space telescopes. In this paper, an ultralight mirror is designed by obtaining the structure and parameters of a mirror with an aperture of 2 m through experimental design and multiobjective integrated optimization. Specifically, the materials near the neutral surface were replaced with elliptical holes. The back of the mirror was supported at three points. Finite-element analysis shows that the mirror had a surface figure error of 10.4 nm under 1 g in the $x$ direction (gravity direction), which is sufficiently high to be applied to visible light optical systems. Further, the eigenfrequencies of mirror components were obtained through finite-element analysis: 70 Hz in the $x$ direction, 70 Hz in the $y$ direction, and 90 Hz in the $z$ direction. The results demonstrate the excellent dynamics performance of the designed mirror. Compared with test results, the relative error of eigenfrequencies was within 4%. Hence, our ultralight design outputs reliable optimization results and applies to the development of large-aperture ultralight space mirrors. Finally, the ultralight mirror was prepared from reaction-bonded silicon carbide. The mass and surface density of the prepared mirror were 105 kg and ${{34}}\;{\rm{kg/}}{{\rm{m}}^2}$, respectively. The mirror mass was 50% lighter than that of the mirrors designed by traditional lightweight methods.
© 2021 Optica Publishing Group
Full Article | PDF ArticleMore Like This
Shutian Liu, Rui Hu, Quhao Li, Ping Zhou, Zhigang Dong, and Renke Kang
Appl. Opt. 53(35) 8318-8325 (2014)
Liu Zhang, Tailei Wang, Fan Zhang, Huanyu Zhao, Yu Zhao, and Xiaoyi Zheng
Appl. Opt. 60(2) 417-426 (2021)
Rui Hu, Shutian Liu, and Quhao Li
Appl. Opt. 56(15) 4551-4560 (2017)