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 Primary mirror segmentation for large optical telescopes: an inverse map projection approach Zheng Y(郑奕); Tang LF(汤丽峰); Liang B(梁斌); Li Y(李颖) 2021-07 Source Publication Applied Optics Volume 60Issue:21Pages:6015-6022 Abstract Large segmented-mirror telescopes are powerful tools used in modern astronomy. Segmentation of the primary mirror is important for support design, mirror fabrication, and construction cost reduction. A curvature study showed that a primary mirror with a solid angle of less than $\pi /{{6}}$ can be well divided by projecting identical hexagonal tilings onto a curved surface. Three approaches, based on map projection, are presented. The conformal method, preserving the angle locally, provides optimal regularity. The equal-area algorithm generates a partition having zero area variation. The equidistant projection minimizes the circumscribed diameter of the segments. These approaches are unified by a newly proposed compromise approach, which provides the necessary adjustment range for individual preferences. The performances of the three approaches are numerically verified using the Thirty Meter Telescope model. This study verifies the effectiveness of the scaling rule and sheds light on the mechanism of primary mirror segmentation. Subject Area 天文技术与方法 Document Type 期刊论文 Identifier http://ir.niaot.ac.cn/handle/114a32/1948 Collection 期刊论文 Affiliation 南京天文光学技术研究所 Recommended CitationGB/T 7714 Zheng Y,Tang LF,Liang B,et al. Primary mirror segmentation for large optical telescopes: an inverse map projection approach[J]. Applied Optics,2021,60(21):6015-6022. APA Zheng Y,Tang LF,Liang B,&Li Y.(2021).Primary mirror segmentation for large optical telescopes: an inverse map projection approach.Applied Optics,60(21),6015-6022. MLA Zheng Y,et al."Primary mirror segmentation for large optical telescopes: an inverse map projection approach".Applied Optics 60.21(2021):6015-6022.