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Proceedings Paper

Design and computation of thermal control in LAMOST enclosure
Author(s): Weina Hao; Zhengqiu Yao; Xiangqun Cui; Zhiping Chen; Huli Shi
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Paper Abstract

The optical path of LAMOST is 60-meter long with its main optical axis fixed and lying in close to horizontal orientation, that causes much more serious dome seeing problem than the one in conventional 4-meter class telescopes. The temperature gradients generated by many thermal sources in the dome induce the seeing problem. It is necessary to control of thermal distribution inside the enclosure to keep a good dome seeing. In this paper we introduce our computation and experiments. Through analysis we have obtained a method dealing with design of the cooling system to remove the effect of local heat source and reduce temperature gradients. The methods are outlined as follows: Cool the main heat sources with the cooling air with a temperature of 5°C lower than the ambient temperature. Because of the temperature difference between summer and winter, we have developed two sets of cooling systems to deal with respectively, particularly to keep the system workable in wintertime. We have designed a special structure for removing heat resources inside the enclosure. There is enough ventilation to keep the wind velocity at 0.5~1m/s in the optical path, and special fans generating low velocity wind provide good ventilation and avoid vibration noises. Temperature sensors feeding signals back to the computer, which adjusts the control loop to maintain a good thermal distribution in optical path and to minimize the dome seeing problem.

Paper Details

Date Published: 29 September 2004
PDF: 8 pages
Proc. SPIE 5495, Astronomical Structures and Mechanisms Technology, (29 September 2004); doi: 10.1117/12.551216
Show Author Affiliations
Weina Hao, National Astronomical Observatories/Nanjing Astronomical Observatories (China)
Zhengqiu Yao, National Astronomical Observatories/Nanjing Astronomical Observatories (China)
Xiangqun Cui, National Astronomical Observatories/Nanjing Astronomical Observatories (China)
Zhiping Chen, Hangzhou Institute of Electronics and Engineering (China)
Huli Shi, Hangzhou Institute of Electronics and Engineering (China)

Published in SPIE Proceedings Vol. 5495:
Astronomical Structures and Mechanisms Technology
Joseph Antebi; Dietrich Lemke, Editor(s)

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