Auto-focusing Schemes for LAMOST Multipurpose Fiber-fed Spectrographs | |
Long Li; Zhongwen Hu; Jianing Wang; Yongtian Zhu; Lei Wang | |
2007-11-21 | |
Source Publication | Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes |
Volume | 6721 |
Issue | 6721 |
Pages | Vol.6721 0Q-1-7 |
Conference Date | 2007-7-8 |
Conference Place | Chengdu, China |
Funding Organization | The International Society for Optical Engineering |
Publisher | SPIE |
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 autofocusing
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. |
Keyword | Low Resolution Spectrograph Auto-focusing Resolution |
Subject Area | 郭守敬望远镜(lamost) ; 天文光谱仪 ; 天文技术与方法 |
Document Type | 会议论文 |
Identifier | http://ir.niaot.ac.cn/handle/114a32/467 |
Collection | 会议论文 |
Recommended Citation GB/T 7714 | Long Li,Zhongwen Hu,Jianing Wang,et al. Auto-focusing Schemes for LAMOST Multipurpose Fiber-fed Spectrographs[C]:SPIE,2007:Vol.6721 0Q-1-7. |
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Auto-focusing Scheme(304KB) | 开放获取 | CC BY-NC-ND | View Download |
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