22 July 2016 Stressed mirror annular polishing for scale-down TMT primary segments
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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.
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Xinnan Li, Xinnan Li, Zibo Jiang, Zibo Jiang, Xuefei Gong, Xuefei Gong, Haiying Zhang, Haiying Zhang, Kunxing Chen, Kunxing Chen, Yi Zheng, Yi Zheng, Bo Li, Bo Li, Binbin Yu, Binbin Yu, Chen Xu, Chen Xu, Bo Ji, Bo Ji, Qiuyun Xu, Qiuyun Xu, } "Stressed mirror annular polishing for scale-down TMT primary segments", Proc. SPIE 9912, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II, 99120A (22 July 2016); doi: 10.1117/12.2231612; https://doi.org/10.1117/12.2231612
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