Ground-testing method of a zero gravity wavefront for space telescopes

doi:10.1364/AO.58.003042

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	Ground-testing method of a zero gravity wavefront for space telescopes
	Guo, Yongwei 1,2,3; Dong, Zhichao 1; Wang, Shen 1; Sophia Dai, Y.2,3
刊名	APPLIED OPTICS
	2019-04-20
卷号	58 期号:12 页码:3042-3052
ISSN号	1559-128X
DOI	10.1364/AO.58.003042
英文摘要	A ground-testing method and an algorithm are presented to demonstrate how to predict the image quality for an orbiting space telescope under 0 g. By using a mathematical model of the ground-testing system, one has to change the gravity conditions to get a 0 g wavefront. For the Hinode space telescope, one can change the gravity acceleration from +1 g to -1 g by rotating the telescope upside down, which is difficult for larger optical space telescopes. In this paper we introduce a new algorithm to get 0 g results by measuring the wavefronts under different gravity acceleration sets. In this way we can predict the 0 g image quality under any gravity acceleration value. With the algorithm, we propose to use oscillation in the vertical direction to mimic the change of the telescope figure under acceleration caused by gravity. Criteria of tests and estimates of errors are discussed in this paper. A test experiment is designed and performed for a scaled model of the space solar telescope (SST). The optical test system includes a 1.4-mm-thick, 101.6-mm-diameter flat mirror, and has almost the same gravity sag as the SST's 1-m-diameter primary has; thus, it can be compared to the Hinode method. As a suspending spring mass oscillation system, it provides a gravity environment varying sinusoidally around 1 g. Gravity accelerations and response wavefronts are aligned in time. Test results and comparisons to Hinode's are achieved and listed. The differences between our method and Hinode's results is less than 1/20 lambda RMS, which is sufficient for testing a diffraction limited space optical system. (C) 2019 Optical Society of America
资助项目	National Natural Science Foundation of China (NSFC)[11373046]
WOS关键词	HINODE
WOS研究方向	Optics
语种	英语
出版者	OPTICAL SOC AMER
WOS记录号	WOS:000465188100001
资助机构	National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC)
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/26064]
专题	中国科学院国家天文台
通讯作者	Guo, Yongwei
作者单位	1.Chinese Acad Sci, Natl Astron Observ, CAS Key Lab Space Astron & Technol, Beijing 100101, Peoples R China 2.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100101, Peoples R China 3.Chinese Acad Sci, South Amer Ctr Astron, Camino Observ 1515, Santiago, Chile
推荐引用方式 GB/T 7714	Guo, Yongwei,Dong, Zhichao,Wang, Shen,et al. Ground-testing method of a zero gravity wavefront for space telescopes[J]. APPLIED OPTICS,2019,58(12):3042-3052.
APA	Guo, Yongwei,Dong, Zhichao,Wang, Shen,&Sophia Dai, Y..(2019).Ground-testing method of a zero gravity wavefront for space telescopes.APPLIED OPTICS,58(12),3042-3052.
MLA	Guo, Yongwei,et al."Ground-testing method of a zero gravity wavefront for space telescopes".APPLIED OPTICS 58.12(2019):3042-3052.