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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
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume466Issue:2Pages:1669-1687
AbstractFocal 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.
SubtypeArticle
KeywordInstrumentation: Miscellaneous Instrumentation: Spectrographs Methods: Data Analysis Techniques: Miscellaneous Techniques: Spectroscopic
WOS HeadingsScience & Technology ; Physical Sciences
Funding OrganizationNational Development and Reform Commission ; National Development and Reform Commission ; National Development and Reform Commission ; National Development and Reform Commission
DOI10.1093/mnras/stw3137
WOS KeywordINSTRUMENTATION
Indexed BySCI
Language英语
Funding OrganizationNational Development and Reform Commission ; National Development and Reform Commission ; National Development and Reform Commission ; National Development and Reform Commission
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000398284600027
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/8255
Collection应用天文研究部
Affiliation1.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
Recommended Citation
GB/T 7714
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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