A new calculation of LAMOST optical vignetting

Shuang Li; Ali Luo; Jianjun Chen; Genrong Liu; Georges Comte

doi:10.1117/12.925990

25 September 2012 A new calculation of LAMOST optical vignetting

Shuang Li, Ali Luo, Jianjun Chen, Genrong Liu, Georges Comte

Proceedings Volume 8449, Modeling, Systems Engineering, and Project Management for Astronomy V; 84491Q (2012) https://doi.org/10.1117/12.925990
Event: SPIE Astronomical Telescopes + Instrumentation, 2012, Amsterdam, Netherlands

Abstract

A new method to calculate the optical vignetting of LAMOST (Large Sky Area Muti-Object Fiber Spectroscopic Telescope) is presented. With the pilot survey of LAMOST, it is necessary to have thorough and quantitative estimation and analysis on the observing efficiency which is affected by various factors: the optical system of the telescope and the spectrograph that is vignetting, the focal instrument, and the site condition. The wide field and large pupil of LAMOST fed by a Schmidt reflecting mirror, with a fixed optical axis coinciding with the local polar axis, lead to significant telescope vignetting, caused by the effective light-collecting area of the corrector, the light obstruction of the focal-plate, and the size of the primary mirror. A calculation of the vignetting has been presented by Xue et al. (2007), which considered 4 meter circle limitation and based on ray-tracking. In fact, there is no effect of the 4 meter circle limitation, so that we compute the vignetting again by means of obtaining the ratio of effective projected area of the corrector. All the results are derived by AUTOCAD. Moreover, the vignetting functions and vignetting variations with declination at which the telescope is pointed and the position considered in the focal surface are presented and analysed. Finally, compared with the ray-tracing method to obtain the vignetting before, the validity and availability of the proposed method are illustrated.

Citation Download Citation

Shuang Li, Ali Luo, Jianjun Chen, Genrong Liu, and Georges Comte "A new calculation of LAMOST optical vignetting", Proc. SPIE 8449, Modeling, Systems Engineering, and Project Management for Astronomy V, 84491Q (25 September 2012); https://doi.org/10.1117/12.925990

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KEYWORDS

Vignetting

Telescopes

Mirrors

Reflector telescopes

Astronomical imaging

Astronomy

Spherical lenses

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