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Proceedings Paper

Large-sky-area multiobject fiber spectroscopic telescope (LAMOST) and its key technology
Author(s): Ding-qiang Su; Xiangqun Cui; Ya-nan Wang; Zheng qiu Yao
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Paper Abstract

The optical system of LAMOST is a special reflecting Schmidt system. It has an aperture of 4 m, f ratio of 5 and a 5 degree(s) field of view. The main optical axis is fixed on the meridian plane and tilted 25 degree(s) to the horizontal from south to north. The celestial objects were observed for 1.5 hours when they pass through the meridian. The reflecting Schmidt plane, MA, and the spherical mirror, MB, are segmented mirrors. MB is fixed on the foundation. The shape of the reflecting Schmidt plate has to be changed with different declination (delta) and in the tracking process. This is achieved with active optics. About 4000 optical fibers are planed to put on the focal surface. Some key technologies for LAMOST have been studied and presented in this paper: the calculation and testing method for thin mirror and segmented mirror active optics; the preliminary calculation and the experiment for active optics; the simulated calculation for optical image quality in 1.5 hours observation; a preliminary design of the alt-azimuth mounting and tracking system of MA.

Paper Details

Date Published: 25 August 1998
PDF: 15 pages
Proc. SPIE 3352, Advanced Technology Optical/IR Telescopes VI, (25 August 1998); doi: 10.1117/12.319250
Show Author Affiliations
Ding-qiang Su, Nanjing Astronomical Instruments Research Ctr. (China)
Xiangqun Cui, Nanjing Astronomical Instruments Research Ctr. (China)
Ya-nan Wang, Nanjing Astronomical Instruments Research Ctr. (China)
Zheng qiu Yao, Nanjing Astronomical Instruments Research Ctr. (China)

Published in SPIE Proceedings Vol. 3352:
Advanced Technology Optical/IR Telescopes VI
Larry M. Stepp, Editor(s)

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