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Accurate focusing technology for the coronal images
Zhang XF(张雪飞)1,2,3; Liu Y(刘煜)1,3; Li XB(李小波)1,3; Song TF(宋腾飞)1,3; Zhao MY(赵明宇)1; Wang JX(王晶星)1
会议录名称Proceedings of SPIE - ASTRONOMICAL OPTICS: DESIGN, MANUFACTURE, AND TEST OF SPACE AND GROUND SYSTEMS II
2019-09-09
卷号11116
DOI10.1117/12.2528738
会议录编者/会议主办者Hull, TB; Kim, DW; Hallibert, P
产权排序第1完成单位
收录类别EI ; CPCI
会议名称Symposium on Astronomical Optics - Design, Manufacture, and Test of Space and Ground Systems II held at SPIE Optical Engineering + Applications Conference
会议日期2019-08-12
会议地点San Diego, CA
会议赞助商SPIE
关键词Image focusing Gradient algorithm Coronagraph Occulter
摘要

Optical imaging has been widely used in many fields as a tool for acquiring images, which can be used in microscopic observation, medical analysis, remote sensing, and astronomical observation. In the field of astronomical observations, it is very important to adjust the focus of the coronagraph. Due to the significant differences of the intensity between the corona and the solar photosphere, the ground-based coronagraph usually adopt an occulter, which is a little larger than the solar disk, to shield the light from the solar photosphere. In absence of the Sun as reference, focusing of the coronagraph is much harder than usual optical system. For the ground-based coronagraph, we developed a method of focusing using the solar disk image behind this disk occulter. Based on a series of images collected by shifting the center of the solar disk, we extract edge information of the solar disk and use the edge gradient algorithm to fit the focal length. This method can reduce the error of manual focusing. We can precisely find out the coronagraph focal point and obtain a clear coronal image, which lays a foundation for the technical support aboutremote control system of the coronagraph.

资助项目Natural Science Foundation of China (NSFC)[11873090] ; Natural Science Foundation of China (NSFC)[11533009] ; Natural Science Foundation of China (NSFC)[1603074] ; Key Laboratory of Geospace Environment, CAS, University of Science & Technology of China
项目资助者Natural Science Foundation of China (NSFC)[11873090, 11533009,11603074] ; Key Laboratory of Geospace Environment, CAS, University of Science & Technology of China
语种英语
学科领域物理学 ; 光学 ; 天文学 ; 太阳与太阳系 ; 太阳与太阳系其他学科 ; 天文学其他学科
学科门类理学 ; 理学::天文学
文章类型Proceedings Paper
出版者SPIE-INT SOC OPTICAL ENGINEERING
出版地1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
ISBN号978-1-5106-2925-7; 978-1-5106-2926-4
ISSN号0277-786X
URL查看原文
WOS记录号WOS:000535238500036
WOS研究方向Engineering ; Optics
WOS类目Engineering, Aerospace ; Optics
EI入藏号20194407611722
EI主题词Edge detection
EI分类号537.1 Heat Treatment Processes - 731.1 Control Systems - 741.3 Optical Devices and Systems - 746 Imaging Techniques
引用统计
文献类型会议论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/21606
专题选址与日冕观测组
通讯作者Zhang XF(张雪飞)
作者单位1.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650011, China
2.University of Chinese Academy of Sciences, Beijing 100049, China
3.Key Laboratory of Geospace Environment, University of Science & Technology of China, Chinese Academy of Sciences(CAS), Hefei 230026, China
第一作者单位中国科学院云南天文台
通讯作者单位中国科学院云南天文台
推荐引用方式
GB/T 7714
Zhang XF,Liu Y,Li XB,et al. Accurate focusing technology for the coronal images[C]//Hull, TB; Kim, DW; Hallibert, P. 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA:SPIE-INT SOC OPTICAL ENGINEERING,2019.
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