Atmospheric turbulence profiling in Korea with SLODAR

SPIE/COS Photonics Asia Pub Date : 2023-11-27 DOI:10.1117/12.2685354

Jiyoung Joo, Hyeon Seung Ha, Seok Gi Han, Jun Ho Lee, Timothy Butterley

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Abstract

We developed SLODAR (SLOpe Detection And Ranging) in order to measure atmospheric characteristics in Geochang, Korea for the purpose of utilizing adaptive optics technology. In order to operate adaptive optics, it is necessary to measure the Fried parameter (r0) and Refractive index structure constant (Cn2) of the corresponding region, which can be measured through atmospheric characteristics measuring module. SLODAR mounts two wavefront sensors on a telescope and directs a binary star towards each sensor using a prism mirror. Then it measures the slope by detecting the focus shift caused by the atmospheric disturbance using the binary star. We attached z-axis motors to SLODAR and Prism to ensure that the focal position would always be the same even if the separation angle of the binary star changed. SLODAR can measure atmospheric characteristics at various altitudes, depending on the separation angle of the binary star. It is divided into wide mode (measured altitude about 400 ~ 700 m) and narrow mode (measured altitude about 5 ~ 9 km). We obtained r0 and Cn2 through Auto-Covariance and Cross-Covariance, respectively, from the measured slope. Currently, we are measuring the annual average r0 Cn2 in Geochang, Korea.

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利用 SLODAR 对韩国的大气湍流进行剖面分析

为了利用自适应光学技术，我们开发了 SLODAR（SLOpe Detection And Ranging），用于测量韩国吉昌的大气特征。为了操作自适应光学技术，必须测量相应区域的弗里德参数（r0）和折射率结构常数（Cn2），这些参数可通过大气特性测量模块进行测量。SLODAR 将两个波前传感器安装在望远镜上，并使用棱镜将双星导向每个传感器。然后，它利用双星检测大气扰动引起的焦距偏移，从而测量斜率。我们在 SLODAR 和棱镜上安装了 Z 轴电机，以确保即使双星的分离角发生变化，焦点位置也始终保持不变。根据双星的分离角，SLODAR 可以测量不同高度的大气特性。它分为宽模式（测量高度约为 400 ~ 700 米）和窄模式（测量高度约为 5 ~ 9 千米）。我们通过自动协方差和交叉协方差，分别从测量到的斜率中得到了 r0 和 Cn2。目前，我们正在韩国吉昌测量年平均 r0 Cn2。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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SPIE/COS Photonics Asia

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