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The Correction of Fiber Throughput Variation due to Focal Ratio Degradation

Published online by Cambridge University Press:  06 January 2014

Jianjun Chen ,
Zhongrui Bai ,
Guangwei Li  and
Haotong Zhang
Jianjun Chen
Affiliation:
National Astronomical Observatories, Chinese Academy of Sciences 20A Datun Road, Chaoyang District, Beijing, China email: jjchen@nao.cas.cn
Zhongrui Bai
Affiliation:
National Astronomical Observatories, Chinese Academy of Sciences 20A Datun Road, Chaoyang District, Beijing, China email: jjchen@nao.cas.cn
Guangwei Li
Affiliation:
National Astronomical Observatories, Chinese Academy of Sciences 20A Datun Road, Chaoyang District, Beijing, China email: jjchen@nao.cas.cn
Haotong Zhang
Affiliation:
National Astronomical Observatories, Chinese Academy of Sciences 20A Datun Road, Chaoyang District, Beijing, China email: jjchen@nao.cas.cn
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Abstract

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The focal ratio degradation (FRD) of optical fibers is a major source causing light loss to astronomical multi-fibre instruments like LAMOST (Oliveira, A. C, et al. 2005). The effects of stress and twist during mounting and rotation of the fibers could change the FRD for individual fibers (Clayton 1989), which means that the transmission efficiency of each individual fiber will vary. We investigate such throughput variation among LAMOST fibers and its relevance to the intensity of sky emission lines (Garstang 1989) over the full wavelength coverage. On the basis of the work, we present an approach to correct the varied fiber throughput by measuring the strength of the sky emission lines as the secondary throughput correction.

Keywords

fiber throughput variationfocal ratio degradation
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 9 , Symposium S298: Setting the scene for Gaia and LAMOST , May 2013 , pp. 398
Copyright
Copyright © International Astronomical Union 2014 

References

Clayton, C. A. 1989, AA, 213, 502Google Scholar
Oliveira, A. C, et al. 2005, MNRAS, 356, 1079Google Scholar
Garstang, R. H. 1989, PASP, 101, 306CrossRefGoogle Scholar