Hydrostatic support system for in-situ optical testing of a 4 m aperture SiC mirror

	Hydrostatic support system for in-situ optical testing of a 4 m aperture SiC mirror
	Hu, H.-F.; H.-W. Zhao; Z.-Y. Liu; X. Luo and X.-J. Zhang
	2017
发表期刊	Guangxue Jingmi Gongcheng/Optics and Precision Engineering
卷号	25 期号:10
摘要	A set of hydrostatic support system for a 4 m SiC mirror in-situ testing was designed to reduce the risk of ultra-large mirror off-line testing and to improve fabrication efficiency. Firstly, the analytical formula for calculating support stiffness was derived, and its main factor was found. Then, some support samples were tested, and the support stiffness of a single support unit in different groups was predicted by combining the sample results and analytical formula. Finally, the stability of the support system was evaluated by pressurization test and in-situ testing, and the mirror surface precision with its gravity offloaded by the support system was calculated by finite element simulation. Results show that the average stiffness is about 1.9 kN/mm with a relative difference among support units about 3% when 5 units are linked together, the stiffness for a single unit isolated is as high as 15 kN/mm, and 3 kinds of unit stiffness in the support system are 1.7, 1.1 and 0.8 kN/mm respectively. Moreover, pressurization test shows a slow pressure change, which indicates that the system is well sealed. When the hydrostatic system was used for a 4 m mirror, the height changes rise up and down within 50 m in 11 days, and the relative change is less than 20 m. When the mirror is supported on 54 units with stiffness difference by 3% randomly, the surface RMS is less than 20 nm. The proposed system meets the requirement of in-situ optical testing for precision and stability. 2017, Science Press. All right reserved.
收录类别	ei
语种	中文
文献类型	期刊论文
条目标识符	http://ir.ciomp.ac.cn/handle/181722/58944
专题	中科院长春光机所知识产出
推荐引用方式 GB/T 7714	Hu, H.-F.,H.-W. Zhao,Z.-Y. Liu,et al. Hydrostatic support system for in-situ optical testing of a 4 m aperture SiC mirror[J]. Guangxue Jingmi Gongcheng/Optics and Precision Engineering,2017,25(10).
APA	Hu, H.-F.,H.-W. Zhao,Z.-Y. Liu,&X. Luo and X.-J. Zhang.(2017).Hydrostatic support system for in-situ optical testing of a 4 m aperture SiC mirror.Guangxue Jingmi Gongcheng/Optics and Precision Engineering,25(10).
MLA	Hu, H.-F.,et al."Hydrostatic support system for in-situ optical testing of a 4 m aperture SiC mirror".Guangxue Jingmi Gongcheng/Optics and Precision Engineering 25.10(2017).

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