Mr. Hyeon Seung Ha Profile

Hyeon Seung Ha

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Proceedings Article | 27 November 2023 Paper

Atmospheric turbulence profiling in Korea with SLODAR

J. Joo, H. Ha, S. Han, J. Lee, T. Butterley

Proceedings Volume 12767, 127670I (2023) https://doi.org/10.1117/12.2685354

KEYWORDS: Atmospheric optics, Atmospheric sensing, Binary stars, Wavefront sensors, Adaptive optics, Ranging, Prisms, Atmospheric turbulence, Profiling, Refractive index

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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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