Optimizing the accuracy and efficiency of optical turbulence profiling using adaptive optics telemetry for extremely large telescopes
Optimizing the accuracy and efficiency of optical turbulence profiling using adaptive optics telemetry for extremely large telescopes
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使用自适应光学遥测技术优化超大望远镜光学湍流剖面的准确性和效率
DOI：
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发表时间：
2018
影响因子：
4.8
通讯作者：
R. Wilson
中科院分区：
文献类型：
--
作者：
D. Laidlaw;J. Osborn;T. Morris;A. Basden;O. Beltramo;T. Butterley;E. Gendron;A. Reeves;G. Rousset;M. Townson;R. Wilson
地面望远镜上的先进自适应光学（AO）仪器需要准确了解作为高度函数的大气湍流强度。这些信息有助于点扩散函数重建、AO时间控制技术，并且是宽场AO系统所需的，以优化观察到的波前的重建。大气的变化性使得在真实的时间内测量光学湍流廓线非常重要。该测量可以通过将解析生成的协方差矩阵拟合到Shack-Hartmann波前传感器（SHWFS）质心的互协方差来执行。在这项研究中，我们探讨了减少交叉协方差数据点的协方差地图感兴趣区域（ROI）的好处。还介绍了一种使用协方差图ROI来测量和补偿SHWFS未对准的技术。我们比较的协方差矩阵和地图ROI光学湍流轮廓使用模拟和天空数据从加那利群岛，AO演示的4.2米威廉赫歇尔望远镜，拉帕尔马的准确性。对天空的CANARY结果进行了比较，从立体SCIDAR-一个专用的高分辨率光学湍流剖面仪同期配置文件。结果表明，协方差图ROI优化AO遥测光学湍流剖面的精度。此外，我们表明，协方差图ROI减少了一个非常大的望远镜规模的系统的拟合时间的一个因素的72。我们开发的用于收集所有呈现结果的软件包现在是开源的。
Advanced adaptive optics (AO) instruments on ground-based telescopes require accurate knowledge of the atmospheric turbulence strength as a function of altitude. This information assists point spread function reconstruction, AO temporal control techniques and is required by wide-field AO systems to optimize the reconstruction of an observed wavefront. The variability of the atmosphere makes it important to have a measure of the optical turbulence profile in real time. This measurement can be performed by fitting an analytically generated covariance matrix to the cross-covariance of Shack–Hartmann wavefront sensor (SHWFS) centroids. In this study we explore the benefits of reducing cross-covariance data points to a covariance map region of interest (ROI). A technique for using the covariance map ROI to measure and compensate for SHWFS misalignments is also introduced. We compare the accuracy of covariance matrix and map ROI optical turbulence profiling using both simulated and on-sky data from CANARY, an AO demonstrator on the 4.2 m William Herschel telescope, La Palma. On-sky CANARY results are compared to contemporaneous profiles from Stereo-SCIDAR – a dedicated high-resolution optical turbulence profiler. It is shown that the covariance map ROI optimizes the accuracy of AO telemetry optical turbulence profiling. In addition, we show that the covariance map ROI reduces the fitting time for an extremely large telescope-scale system by a factor of 72. The software package we developed to collect all of the presented results is now open source.
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影响因子：
4.8
作者：
H. Shepherd;J. Osborn;R. Wilson;T. Butterley;R. Avila;V. Dhillon;T. Morris
通讯作者：
H. Shepherd;J. Osborn;R. Wilson;T. Butterley;R. Avila;V. Dhillon;T. Morris
通过自适应光学遥测在线估计波前外尺度轮廓
影响因子：
4.8
作者：
Guesalaga A
通讯作者：
Guesalaga A
使用高斯混合模型对具有时间变化的合成大气湍流剖面进行建模
影响因子：
4.8
作者：
Jia P
通讯作者：
Jia P
MOAO 首次与 CANARY 进行空中演示
影响因子：
6.5
作者：
Gendron E
通讯作者：
Gendron E