Improving Cn2 calculations during stable conditions using an ultrasonic anemometer

Yaakov Monsa; Mara Baraban

doi:10.1117/12.2679328

19 October 2023 Improving C_n² calculations during stable conditions using an ultrasonic anemometer

Yaakov Monsa, Mara Baraban

Proceedings Volume 12731, Environmental Effects on Light Propagation and Adaptive Systems VI; 1273105 (2023) https://doi.org/10.1117/12.2679328
Event: SPIE Remote Sensing, 2023, Amsterdam, Netherlands

Abstract

Atmospheric optical turbulence strength, parametrized by the atmosphere refractive index C_n², mainly depends on temperature fluctuations. Recently, using ultrasonic anemometers (USAM) for fast temperature measurements has become very attractive since it possesses the advantage of measuring C_n² by a single-point device rather than along a path. Here, we performed a fundamental experiment with multiple devices measuring C_n² in parallel, including a scintillometer and USAM at the center of its path on flat and uniform terrain. This campaign reveals that the main challenge for measuring turbulence strength using USAM occurs in meandering stable conditions, where the changes in wind speed and sonic temperature are lower than USAM sensitivity, and the energy budget deviates from the pure Kolmogorov spectrum. A detailed comparison of the scintillometer and USAM results enable us to optimize the calculation of C_n² from the USAM measurements in meandering stable conditions.

Conference Presentation

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Yaakov Monsa and Mara Baraban "Improving C_n² calculations during stable conditions using an ultrasonic anemometer", Proc. SPIE 12731, Environmental Effects on Light Propagation and Adaptive Systems VI, 1273105 (19 October 2023); https://doi.org/10.1117/12.2679328

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