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Auto-focusing Schemes for LAMOST Multipurpose Fiber-fed Spectrographs
Long Li; Zhongwen Hu; Jianing Wang; Yongtian Zhu; Lei Wang
Source PublicationAdvanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes
PagesVol.6721 0Q-1-7
Conference Date2007-7-8
Conference PlaceChengdu, China
Funding OrganizationThe International Society for Optical Engineering
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.
KeywordLow 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
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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