Optical turbulence profiling with single star SCIDAR technique
Optical turbulence profiling with single star SCIDAR technique
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DOI：
10.1007/s11434-013-6083-9
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发表时间：
2013-11
影响因子：
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通讯作者：
Liyong Liu;Yong-qiang Yao;J. Vernin;Hong-shuai Wang;M. Chadid;Yiping Wang;C. Giordano;J. Yin;X. Qian
中科院分区：
文献类型：
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作者：
Liyong Liu;Yong-qiang Yao;J. Vernin;Hong-shuai Wang;M. Chadid;Yiping Wang;C. Giordano;J. Yin;X. Qian
为了表征光学湍流，我们研制了一台单星星SCIDAR（SSS），用于测量Cn 2随高度的分布。SSS由一个40厘米望远镜和一个CCD相机组成，用于快速采样恒星闪烁图案。计算了单颗星星图像的时空自相关函数和互相关函数，给出了光学湍流强度Cn ~ 2（h）和风速V（h）的垂直廓线。利用这种新的SSS实验，可以获得从地面到大气顶部的湍流廓线，从而可以确定视宁度、等晕角和相干时间。大气光学湍流的详细特性对于主动和被动成像、天文台址测试、自适应光学、激光通信、目标跟踪和指示以及激光束控制都是重要的。我们计划改进SSS的自动化，以便即使在我们预计在青藏高原或南极洲Dome A遇到的恶劣天气和海拔条件下也能够常规使用它。SSS也将应用于未来中国极大望远镜的现场测试活动。
In order to characterize optical turbulence, we have developed a single star SCIDAR (SSS) for measurement of the distribution ofCn2with height. The SSS consists of a 40 cm telescope and a CCD camera for fast sampling of stellar scintillation pattern. Spatiotemporal auto and cross-correlation functions of the single star images are computed, providing vertical profiles of optical turbulence intensityCn2(h) and wind speedV(h). Using this new SSS experiment, profiles of turbulence can be obtained from the ground to the top of atmosphere, allowing the determination of seeing, isoplanatic angle and coherence time. Detailed characteristics of atmospheric optical turbulence are important for active and passive imaging, astronomical site testing, adaptive optics, laser communications, target tracking and designation, and laser beam control. We plan to improve the robotization of the SSS to be able to use it routinely even under harsh weather and altitude conditions that we expect to encounter on the high Tibetan plateau or at Dome A in Antarctica. SSS will also be applied for the site testing campaign of the future Chinese extremely large telescope.