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Proceedings Paper

Auto-focusing schemes for LAMOST multipurpose fiber-fed spectrographs
Author(s): Long Li; Zhongwen Hu; Jianing Wang; Yongtian Zhu; Lei Wang
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Paper Abstract

The Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) project is one of the National Major Scientific Projects undertaken by the Chinese Academy of Science. There are 16 low resolution multipurpose fiber-fed spectrographs in total, enabling it to obtain the spectrum of celestial objects as faint as down to 20.5. Building auto-focusing systems for the spectrographs is important due to the popularity of instruments. The system enables the optical system to automatically compensate changes in accordance to external variables, such as temperature, timidity, to ensure the spectrum collected more reliably. Image-based algorithm is utilized to calculate the departure of CCD plane from optical focal plane. The calculation also aids to regulation of the system. The defocus value is transformed to the controlling computer of each spectrograph. A driving step-motor performs refocusing function by moving the fiber slit unit to its right position.

Paper Details

Date Published: 21 November 2007
PDF: 7 pages
Proc. SPIE 6721, 3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, 67210Q (21 November 2007); doi: 10.1117/12.782949
Show Author Affiliations
Long Li, National Astronomical Observatories/Nanjing Institute of Astronomical Optics & Technology (China)
Graduate School of the Chinese Academy of Sciences (China)
Zhongwen Hu, National Astronomical Observatories/Nanjing Institute of Astronomical Optics & Technology (China)
Jianing Wang, National Astronomical Observatories/Nanjing Institute of Astronomical Optics & Technology (China)
Yongtian Zhu, National Astronomical Observatories/Nanjing Institute of Astronomical Optics & Technology (China)
Lei Wang, National Astronomical Observatories/Nanjing Institute of Astronomical Optics & Technology (China)


Published in SPIE Proceedings Vol. 6721:
3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes

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