Title

Aperture Averaging Effects On The Probability Density Of Irradiance Fluctuations In Moderate-To-Strong Turbulence

Abstract

The lognormal (LN) and gamma-gamma (GG) distributions are compared to simulated and experimental data of the irradiance fluctuations of a Gaussian beam wave propagating through the atmosphere along a horizontal path, near the ground, in the moderate-to-strong turbulence regime. Irradiance data were collected simultaneously at three receiving apertures of different sizes. Atmospheric parameters were inferred from the measurements and scintillation theory and were used to develop the parameters for the theoretical probability density functions. Numerical simulations were produced with the same C^ value as the experimental data. Aperture-averaging effects were investigated by comparing the irradiance distributions for the three apertures at two different values of the structure parameter Cn2, and, hence, different values of the coherence radius ρ0. For the moderate-to-strong fluctuation regime, the GG distribution provides a good fit to the irradiance fluctuations collected by finite-sized apertures that are significantly smaller than ρ0. For apertures larger than or equal to ρ0, the irradiance fluctuations appear to be LN distributed. © 2007 Optical Society of America.

Publication Date

4-10-2007

Publication Title

Applied Optics

Volume

46

Issue

11

Number of Pages

2099-2108

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1364/AO.46.002099

Socpus ID

34248220487 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/34248220487

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