High-frequency power behavior of the temporal spectrum by large aperture scintillometer

Xu Changshun; Renmin Yuan; Hao Liu; Guisheng Liu; Haiwen Feng; Mengling Yang

doi:10.1117/12.2625721

27 March 2022 High-frequency power behavior of the temporal spectrum by large aperture scintillometer

Xu Changshun, Renmin Yuan, Hao Liu, Guisheng Liu, Haiwen Feng, Mengling Yang

Proceedings Volume 12169, Eighth Symposium on Novel Photoelectronic Detection Technology and Applications; 121699V (2022) https://doi.org/10.1117/12.2625721
Event: Eighth Symposium on Novel Photoelectronic Detection Technology and Applications, 2021, Kunming, China

Abstract

Large aperture scintillometer (LAS) is widely used in the measurement of optical turbulence in the surface layer. The characteristics of atmospheric turbulence are obtained based on the analysis of power spectral density (PSD) of scintillation logarithmic light intensity fluctuation. Spectrum power is an important parameter in the expression of PSD. In this paper, the characteristics of logarithmic light intensity PSD of LAS are analyzed from numerical calculation and experimental measurement. Numerical calculation shows that the theoretical spectrum power of the LAS is -13/3. Three LASs were used to carry out long-term experimental measurements in Beijing, Baoding and Hefei. The results show that the measured spectrum power is inconsistent with the theoretical calculation. The spectrum power of Hefei Station is around -8/3, Baoding station is around -11/3 and Beijing station is around -10/3. 𝑊_{𝑑𝑟𝑜𝑝} is used to represent the PSD where the PSD begins to decrease with frequency, while 𝑊𝑛𝑜𝑖𝑠𝑒 is used to represent the PSD of noise, then the absolute value of the spectrum power increases with the increase of 𝑊_{𝑑𝑟𝑜𝑝}/𝑊_{𝑛𝑜𝑖𝑠𝑒} , and finally approaches to about 11/3.

Citation Download Citation

Xu Changshun, Renmin Yuan, Hao Liu, Guisheng Liu, Haiwen Feng, and Mengling Yang "High-frequency power behavior of the temporal spectrum by large aperture scintillometer", Proc. SPIE 12169, Eighth Symposium on Novel Photoelectronic Detection Technology and Applications, 121699V (27 March 2022); https://doi.org/10.1117/12.2625721

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KEYWORDS

Scintillation

Turbulence

Visibility

Atmospheric optics

Light sources

Refractive index

Interference (communication)

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