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FRD characterization in large-scale for FOCCoS of Prime Focus Spectrograph for Subaru telescope

de Oliveira, Antonio Cesar and Gunn, James E. and Moritani, Yuki and de Oliveira, Ligia and dos Santos, Leandro Henrique and Reiley, Daniel and Belland, Brent and Tamura, Naoyuki and Takato, Naruhisa and Sodré, Laerte, Jr. and Castilho, Bruno and Keith, David L. (2018) FRD characterization in large-scale for FOCCoS of Prime Focus Spectrograph for Subaru telescope. In: Ground-based and Airborne Instrumentation for Astronomy VII. Proceedings of SPIE. No.10702. Society of Photo-optical Instrumentation Engineers (SPIE) , Bellingham, WA, Art. No. 107027R. ISBN 9781510619579.

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The focal ratio degradation effects on optical fibers, technically referred to as FRD, has been the subject of intense studies since the beginning of the use of optical fibers in the construction of instruments applied in astronomy. A number of studies attempt to relate FRD to light loss in the optical system and other studies attempt to qualify and quantify FRD as a function of the stress induced during assembly of the structures supporting the ends of the optical fibers. In this work, we present a large-scale study to characterize FRD in all the fibers that make up the cables of the FOCCoS, Fiber Optical Cable and Connectors System project. FOCCoS, has the main function of capturing the direct light from the focal plane of Subaru Telescope using 2400 optical fibers, each one with a microlens in its tip, and conducting this light through a route containing connectors to a set of four spectrographs. The optical fiber cable is divided in 3 different segments called Cable A, Cable B and Cable C. Multi-fibers connectors assure precise connection among all optical fibers of the segments, providing flexibility for instrument changes. Our study provides procedures and methods to analyze the effects of FRD on all cable segments for each type of termination involved. Special attention is devoted to the understanding of how angular deviations between the input surface of the fiber and the test beam can significantly influence the calculation of FRD in optical fibers.

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Additional Information:© 2018 Society of Photo-optical Instrumentation Engineers (SPIE). We gratefully acknowledge support from the Funding Program for World-Leading Innovative R&D on Science and Technology (FIRST) program “Subaru Measurements of Images and Redshifts (SuMIRe)”, CSTP, Japan. The work in Brazil is supported by the FAPESP grant 2012/00800-4 and the Laboratório Nacional de Astrofísica from MCTI.
Funding AgencyGrant Number
Council for Science and Technology Policy (CSTP)UNSPECIFIED
Fundação de Amparo à Pesquisa do Estado de Sao Paulo (FAPESP)2012/00800-4
Ministério da Ciência, Tecnologia, Inovações e Comunicações (MCTIC)UNSPECIFIED
Series Name:Proceedings of SPIE
Issue or Number:10702
Record Number:CaltechAUTHORS:20190108-113432154
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Official Citation:Antonio Cesar de Oliveira, James E. Gunn, Yuki Moritani, Ligia Souza de Oliveira, Leandro Henrique dos Santos, Daniel Reiley, Brent Belland, Naoyuki Tamura, Naruhisa Takato, Laerte Sodré Junior, Bruno Castilho, David L. Keith, "FRD characterization in large-scale for FOCCoS of Prime Focus Spectrograph for Subaru telescope ," Proc. SPIE 10702, Ground-based and Airborne Instrumentation for Astronomy VII, 107027R (9 July 2018); doi: 10.1117/12.2312287
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:92139
Deposited By: Tony Diaz
Deposited On:08 Jan 2019 19:50
Last Modified:16 Nov 2021 03:47

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