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Proceedings Paper

Stressed mirror annular polishing for scale-down TMT primary segments
Author(s): Xinnan Li; Zibo Jiang; Xuefei Gong; Haiying Zhang; Kunxing Chen; Yi Zheng; Bo Li; Binbin Yu; Chen Xu; Bo Ji; Qiuyun Xu
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Paper Abstract

A new type Stressed Mirror Polishing method using annular polishing machine is developed in NIAOT. It provides good efficiency for the massive production of off-axis segments for the extremely large telescope because 3 or more pieces of segment can be polished simultaneously on a AP machine. With an annular polishing machine with 3.6m diameter, two scale-down TMT segments have been polished. Both 2 segments are Φ1100mm in diameter, with the vertex radius of curvature of 60m and aspheric constant K=-1.000953. The off-axis distances (OAD) are 8m and 12m respectively. After SMAP process, the acceptable surface accuracy can be reached, which is 1.12μm/0.23μm of PV/RMS value for the segment with 8m OAD, and 1.22 μm/0.26 μm for another one.

Paper Details

Date Published: 22 July 2016
PDF: 12 pages
Proc. SPIE 9912, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II, 99120A (22 July 2016); doi: 10.1117/12.2231612
Show Author Affiliations
Xinnan Li, Nanjing Institute of Astronomical Optics & Technology (China)
Zibo Jiang, Nanjing Institute of Astronomical Optics & Technology (China)
Xuefei Gong, Nanjing Institute of Astronomical Optics & Technology (China)
Haiying Zhang, Nanjing Institute of Astronomical Optics & Technology (China)
Kunxing Chen, Nanjing Institute of Astronomical Optics & Technology (China)
Yi Zheng, Nanjing Institute of Astronomical Optics & Technology (China)
Bo Li, Nanjing Institute of Astronomical Optics & Technology (China)
Binbin Yu, Nanjing Institute of Astronomical Optics & Technology (China)
Chen Xu, Nanjing Institute of Astronomical Optics & Technology (China)
Bo Ji, Nanjing Institute of Astronomical Optics & Technology (China)
Qiuyun Xu, Nanjing Institute of Astronomical Optics & Technology (China)


Published in SPIE Proceedings Vol. 9912:
Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II
Ramón Navarro; James H. Burge, Editor(s)

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