Experimental research of alignment error correction by aspheric mirror based on the function of imaging quality

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	Experimental research of alignment error correction by aspheric mirror based on the function of imaging quality
	Zhou Long-Feng 1,2,3; Zhang Ang 1,2; Zhang Jun-Bo 1,2; Fan Xin-Long 1,2; Wei Ling 1,2; Chen Shan-Qiu 1,2; Xian Hao 1,2
刊名	ACTA PHYSICA SINICA
	2016-07-05
卷号	65 期号:13
关键词	reflecting mirror alignment error imaging quality iteration
ISSN号	1000-3290
英文摘要	Image definition will be influenced by alignment errors of mirrors in an optical system consisting of hyperbolic, parabolic or ellipse mirrors. The major factors of alignment errors are gravity, wind loads and heat exchange for some optical systems like ground-based telescopes, while vibration and temperature gradient for systems like space telescopes. Larger telescopes are more sensitive to these error sources, which becomes the concerns of researchers. So the alignment errors of mirrors must be corrected in time to keep systems working in best condition. In order to solve the problem, many methods are proposed based on the detection of wave-front errors using wave-front sensors like Hartmann-Shack. However, wave-front sensors may not be used or cause optical systems to be more complicated. For example, multi-fields must be tested when telescope is working. On the one hand, if a wave-front sensor is used, it must be moved around imaging plane, on the other hand, if more wave-front sensors are used, system must be more complicated. So a new method is discussed for alignment error correction by evaluating the quality of spot diagrams based on the using of stochastic parallel gradient descent (SPGD) algorithm. The method considers the performance metric like spot diagram radius as a function of control parameters and then uses the SPGD optimization algorithm to improve the performance metric. The control parameters include positions of mirrors. The iteration process must be used in the right way to control position parameters. If it is not considered, a problem may come up that positions of spot diagrams may be influenced by the iteration. Furthermore, spot diagrams will probably disappear from detectors. Then the radii of spot diagrams are not correct. So a better way is put forward by the combination of de-center and tilt of mirrors. The way ensures that the position error produced by de-center and tilt are compensated for. A formula is provided in this paper to give the relationship between them. Based on the analysis, an optical system is designed to verify the conclusion. The SPGD algorithm is achieved by computer programming and the position of the mirror is controlled by a hexapod. Firstly, the problem is verified that the spot diagram will disappear from the detector with a normal iteration process. Then the new way is implemented. In the iteration process, the spot diagram is always in the center of the detectors. In order to prove the feasibility of the method, three different alignment errors are tested and all of them each give an Airy disk finally. The experiment can provide reference for engineering practice.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Physics, Multidisciplinary
研究领域[WOS]	Physics
关键词[WOS]	WIDE-FIELD ; TELESCOPE
收录类别	SCI
语种	英语
WOS记录号	WOS:000380364800038
内容类型	期刊论文
源URL	[http://ir.ioe.ac.cn/handle/181551/6471]
专题	光电技术研究所_光电技术研究所被WoS收录文章
作者单位	1.Chinese Acad Sci, Key Lab Adapt Opt, Chengdu 610209, Peoples R China 2.Chinese Acad Sci, Inst Opt & Elect, Chengdu 610209, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Zhou Long-Feng,Zhang Ang,Zhang Jun-Bo,et al. Experimental research of alignment error correction by aspheric mirror based on the function of imaging quality[J]. ACTA PHYSICA SINICA,2016,65(13).
APA	Zhou Long-Feng.,Zhang Ang.,Zhang Jun-Bo.,Fan Xin-Long.,Wei Ling.,...&Xian Hao.(2016).Experimental research of alignment error correction by aspheric mirror based on the function of imaging quality.ACTA PHYSICA SINICA,65(13).
MLA	Zhou Long-Feng,et al."Experimental research of alignment error correction by aspheric mirror based on the function of imaging quality".ACTA PHYSICA SINICA 65.13(2016).