光学学报, 2018, 38 (11): 1112001, 网络出版: 2019-05-09
2.5 m级太阳望远镜主镜热控技术研究 下载: 894次
Thermal Control Technology of Primary Mirror of 2.5 m Class Solar Telescope
成像系统 温度场 视宁度 整场数值求解 气刀 imaging systems temperature field mirror seeing numerical solution of the whole domain air knife
摘要
大口径太阳望远镜主镜直接暴露在空气中,主镜与环境的温差会引起视宁度效应。为降低视宁度效应,研究了主镜底部制冷空气的温度、风速及气刀风速对视宁度的影响。结合南京大学2.5 m多功能望远镜ISMAT的主镜进行热控技术研究,并以0.02 arcsec的主镜视宁度为优化目标。数值求解结果表明:没有气刀时,满足优化目标的制冷空气温度为283.15 K,进口风速为3.5 m/s;有气刀时,满足优化目标的制冷空气温度为283.15 K,进口风速为3m/s,气刀风速不小于3 m/s。
Abstract
The primary mirror of large aperture solar telescope is directly exposed to the air, the temperature difference between the primary mirror and the environment causes the mirror seeing. In order to decrease the mirror seeing, we study the influences of the temperature and the velocity of the cooling air as well as the velocity of the air knife on the mirror seeing. Combined with the primary mirror of 2.5 m called Imaging and Spectroscopic Multi-Application Telescope (ISMAT) of Nanjing University, thermal control technology is studied, and the optimization goal is mirror seeing of 0.02 arcsec. The results of numerical solution show that: the cooling air temperature and the inlet velocity satisfied the optimization goal are 283.15 K and 3.5 m/s without the air knife; the cooling air temperature, the inlet velocity, and velocity of air knife satisfied the optimization goal are 283.15 K, 3 m/s and greater than or equal to 3 m/s.
朱冉, 顾伯忠, 徐洁倩, 张志永, 袁祥岩. 2.5 m级太阳望远镜主镜热控技术研究[J]. 光学学报, 2018, 38(11): 1112001. Ran Zhu, Bozhong Gu, Jieqian Xu, Zhiyong Zhang, Xiangyan Yuan. Thermal Control Technology of Primary Mirror of 2.5 m Class Solar Telescope[J]. Acta Optica Sinica, 2018, 38(11): 1112001.