Influence of distance between the external occulter and object on coronagraph vignetting

	Influence of distance between the external occulter and object on coronagraph vignetting
	Quan W.; Zhang Z.; Zhang H.; Sun M.; Bu H.; Wang M.
	2014
发表期刊	Guangxue Xuebao/Acta Optica Sinica
ISSN	ISBN/02532239
卷号	34 期号:11
摘要	The vignetting caused by the external occulter and support pylon of externally occulted white light coronagraph is analyzed and calculated. The coronagraph is with a field of view of 2.5~15 Ro (Sun Radius), a resolution of 14 sec/pixel, an aperture of 30 mm and an effective focal length of 200 mm. An analytical expression of the vignetting as a function of the distance between external occulter and objective is obtained. The vignetting figures at different distances are acquired by simulation. It is shown that the longer the distance is, the smaller the vignetting. The theoretical results are verified by actual experiments with proposed prototype of the coronagraph. The coronagraph image of target is corrected by vignetting compensation, and the image quality is improved greatly.
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/181722/44079
专题	中科院长春光机所知识产出
推荐引用方式 GB/T 7714	Quan W.,Zhang Z.,Zhang H.,et al. Influence of distance between the external occulter and object on coronagraph vignetting[J]. Guangxue Xuebao/Acta Optica Sinica,2014,34(11).
APA	Quan W.,Zhang Z.,Zhang H.,Sun M.,Bu H.,&Wang M..(2014).Influence of distance between the external occulter and object on coronagraph vignetting.Guangxue Xuebao/Acta Optica Sinica,34(11).
MLA	Quan W.,et al."Influence of distance between the external occulter and object on coronagraph vignetting".Guangxue Xuebao/Acta Optica Sinica 34.11(2014).

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