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A modified method for determining the focal ratio degradation and length properties of optical fibres in astronomy
Yan, Yunxiang1,2; Wang, Gang1; Sun, Weimin3; Luo, A-Li1; Ma, Zhenyu3; Li, Jian1; Wang, Shuqing1
2017-04-01
发表期刊MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷号466期号:2页码:1669-1687
摘要Focal ratio degradation (FRD) is a major contributor to throughput and light loss in a fibre spectroscopic telescope system. We combine the guided mode theory in geometric optics and a well-known model, the power distribution model (PDM), to predict and explain the FRD dependence properties. We present a robust method by modifying the energy distribution method with f-intercept to control the input condition. This method provides away to determine the proper position of the fibre end on the focal plane to improve energy utilization and FRD performance, which lifts the relative throughput up to 95 per cent with variation of output focal ratio less than 2 per cent. This method can also help to optimize the arrangement of the position of focal-plane plate to enhance the coupling efficiency in a telescope. To investigate length properties, we modified the PDM by introducing a new parameter, the focal distance f, into the original model to make it available for a multiposition measurement system. The results show that the modified model is robust and feasible for measuring the key parameter d(0) to simulate the transmission characteristics. The output focal ratio in the experiment does not follow the prediction trend but shows an interesting phenomenon: the output focal ratio increases first to the peak, then decreases and remains stable finally with increasing fibre length longer than 15 m. This provides a reference for choosing the appropriate length of fibre to improve the FRD performance for the design of the fibre system in a telescope.
文章类型Article
关键词Instrumentation: Miscellaneous Instrumentation: Spectrographs Methods: Data Analysis Techniques: Miscellaneous Techniques: Spectroscopic
WOS标题词Science & Technology ; Physical Sciences
资助者National Development and Reform Commission ; National Development and Reform Commission ; National Development and Reform Commission ; National Development and Reform Commission
DOI10.1093/mnras/stw3137
关键词[WOS]INSTRUMENTATION
收录类别SCI
语种英语
资助者National Development and Reform Commission ; National Development and Reform Commission ; National Development and Reform Commission ; National Development and Reform Commission
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
WOS记录号WOS:000398284600027
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被引频次:1[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.bao.ac.cn/handle/114a11/8255
专题应用天文研究部
作者单位1.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100012, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Harbin Engn Univ, Key Lab Infiber Integrated Opt, Minist Educ China, Harbin 150001, Peoples R China
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Yan, Yunxiang,Wang, Gang,Sun, Weimin,et al. A modified method for determining the focal ratio degradation and length properties of optical fibres in astronomy[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2017,466(2):1669-1687.
APA Yan, Yunxiang.,Wang, Gang.,Sun, Weimin.,Luo, A-Li.,Ma, Zhenyu.,...&Wang, Shuqing.(2017).A modified method for determining the focal ratio degradation and length properties of optical fibres in astronomy.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,466(2),1669-1687.
MLA Yan, Yunxiang,et al."A modified method for determining the focal ratio degradation and length properties of optical fibres in astronomy".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 466.2(2017):1669-1687.
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