Atmospheric turbulence profiling using multiple laser star wavefront sensors
Atmospheric turbulence profiling using multiple laser star wavefront sensors
复制标题
使用多个激光星波前传感器进行大气湍流分析
DOI：
10.1111/j.1365-2966.2012.22076.x
复制
发表时间：
2012
影响因子：
4.8
通讯作者：
D. Guzmán
中科院分区：
文献类型：
--
作者：
Angela Cort'es;B. Neichel;A. Guesalaga;J. Osborn;F. Rigaut;D. Guzmán
本文介绍了Gemini South多共轭自适应光学系统（GeMS）的数据预处理和处理方法，以及SLODAR（SLODAR）分析和风廓线技术。
五个GeMS Shack-Hartmann传感器的波前梯度测量，每个指向一个激光引导星星，与变形镜（DM）的命令相结合，发送到三个DM光学共轭在0，4.5和9公里，以重建伪开环斜率。
这些伪开环斜率，然后用于重建大气湍流廓线，基于SLODAR和风廓线方法。我们介绍了SLODAR方法，以及它是如何适应工作在一个闭环，多激光引导星星系统。我们表明，我们的方法可以表征湍流高达16层的高度从0到19公里。介绍了数据预处理和简化方法，并给出了2011年观测结果。风廓线分析是一种强大的技术，不仅用于表征湍流强度，风向和风速，而且还可以为SLODAR结果提供验证工具。最后，如在多个激光器系统中由于瑞利散射，质心增益的变化，和该方法的局限性的fratricide效果的问题也得到了解决。
This paper describes the data pre-processing and reduction methods together with SLOpe Detection And Ranging (SLODAR) analysis and wind profiling techniques for the Gemini South Multi-Conjugate Adaptive Optics System (GeMS).
The wavefront gradient measurements of the five GeMS Shack–Hartmann sensors, each pointing to a laser guide star, are combined with the deformable mirror (DM) commands sent to three DMs optically conjugated at 0, 4.5 and 9 km in order to reconstruct pseudo-open loop slopes.
These pseudo-open loop slopes are then used to reconstruct atmospheric turbulence profiles, based on the SLODAR and wind-profiling methods. We introduce the SLODAR method, and how it has been adapted to work in a closed-loop, multi-laser guide star system. We show that our method allows characterizing the turbulence of up to 16 layers for altitudes spanning from 0 to 19 km. The data pre-processing and reduction methods are described, and results obtained from observations made in 2011 are presented. The wind profiling analysis is shown to be a powerful technique not only for characterizing the turbulence intensity, wind direction and speed, but also as it can provide a verification tool for SLODAR results. Finally, problems such as the fratricide effect in multiple laser systems due to Rayleigh scattering, centroid gain variations, and limitations of the method are also addressed.