地基大口径望远镜圆顶设计  

Dome design of large ground-based telescope

作　　者：刘祥意 王志臣[1,2] 王志 LIU Xiangyi;WANG Zhichen;WANG Zhi(Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences,Changchun 130033,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院长春光学精密机械与物理研究所,吉林长春130033 [2]中国科学院大学,北京100049

出　　处：《光学精密工程》2022年第23期3031-3038,共8页Optics and Precision Engineering

基　　金：国家自然科学基金资助项目(No.U2031126)。

摘　　要：圆顶视宁度是影响地基大口径望远镜成像质量重要的影响因素之一。视宁度产生的原因主要是由于空气折射率的不均匀变化导致,首先通过理论分析确定影响空气折射率的主要因素为空气的温度、速度和压力,然后借助CFD流体仿真软件,得到望远镜圆顶周围附近空气的温度场、速度场和压力场的变化,进而推算出望远镜成像光路中圆顶及望远镜附近周围空气折射率的变化情况,以评估不同结构形式圆顶所产生的圆顶视宁度对望远镜成像的影响。通过仿真分析可知,升降式圆顶更利于望远镜周围空气的温度、速度和压力的快速变化及稳定,能够减少圆顶视宁度的影响,为4 m级及更大口径望远镜的圆顶方案选择及设计提供指导。The dome seeing is an important influencing factor for imaging quality of ground-based large-ap⁃erture telescopes.Seeing is mainly due to the uneven change in the refractive index of air.First,theoreti⁃cal analysis shows that the main factors affecting the refractive index of air are the temperature,velocity,and pressure of the air.Then,with the help of CFD fluid simulation software,the temperature field,ve⁃locity field,and pressure field changes of the air near the telescope dome are obtained,and the change of the refractive index of the air around the dome and telescope is calculated.Thus,the effect of dome seeing produced by domes of different structural forms on telescopic imaging can be evaluated.The simulation analysis shows that the lifting dome is more conducive to the rapid change and stability of the temperature,speed,and pressure of the air around the telescope to reduce the impact of dome seeing.From the perspec⁃tive of dome seeing,this paper provides a guide for the scheme selection and design of a dome at the 4-me⁃ter level and larger telescopes.

关 键 词：望远镜 地基大口径 视宁度 圆顶 

分 类 号：TH743[机械工程—光学工程]