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. πππππ is used to represent the PSD where the PSD
begins to decrease with frequency, while πππππ π is used to represent the PSD of noise, then the absolute value of the
spectrum power increases with the increase of πππππ/πππππ π , and finally approaches to about 11/3.
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