微温脉动仪系统的研究
2013-05-29 15:51:30 益择发布李雪宝,郑艳芳,许 光,李 志
(中国科学院国家天文台云南天文台,云南昆明 650011)
摘要:为评价云南天文台抚仙湖太阳望远镜的圆顶视宁度,研制了一种能测量常温、微温脉动的仪器。在天文建筑物
附近安放两个微温传感器,可以测量影响天文观测的湍流强度的分布情况。介绍了微温脉动仪器的工作原理,硬件设计,软
件设计以及仪器的测试。测试结果表明,该微温测量结果达到了多个传感器响应时间快与同步测量要求,并且微温脉动测
量达到约0.01℃的分辨率,常温测量达到0.1 C精度。
关键词:微温脉动仪;频率测量;圆顶视宁度;湍流强度
中图分类号:TN966—34 文献标识码:A 文章编号:1004~373X(2012)05—0128—03
Researeh on mierothermal m easurement
LI Xue—bao,ZHENG Yan-fang,XU Guang,LI Zhi
(National Astronomical Observatories/Yunnan Observatory,Chinese Academy of Sciences,Kunming 650011,China)
Abstract:For evaluating the dome seeing of the solar telescope at Fuxian Lake of the Yunnan Observatory,an instrument
was designed tO measure the normal temperature and microthermal fluctuations.In the vicinity of the astronomical building,
tWO microtherma1 sensors were set up tO measure atmospheric fluctuations in the surface layer. The overall structure of the
system and the working principle of the microthermal sensor are presented. The hardware design and the software design of
the system are introduced. In the end,the microthermal measurement has been carried on at Fuxian Solar Observatory
(FSO).It is proved that the instrument reaches the temperature resolution of~ for the microthermal fluctuations and accuracy
of for ambient temperature.
Keywords:microthermal instrument;frequency measurement;dom e seeing;turbulence intensity
0 引 言
大气视宁度影响天文观测的分辨率,为了获得更好
的成像质量,通常需要通过天文选址,将天文观测设备
放在大气视宁度较好的站点。若天文建筑设计不当,圆
顶视宁度造成的像质衰减影响可能会比整层大气视宁
度的影响还要严重,也就无法体现出好的天文台址和望
远镜的效力。云南天文台抚仙湖太阳望远镜的圆顶在
设计时采取了许多措施来减少圆顶视宁度的影响,包括
将圆顶设计成开发式、在圆顶附近安装水循环系统、
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