Aperture averaging effects on the probability density of irradiance fluctuations in moderate-to-strong turbulence

    Authors

    F. S. Vetelino; C. Young; L. Andrews;J. Recolons

    Comments

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    Abbreviated Journal Title

    Appl. Optics

    Keywords

    I-K DISTRIBUTION; OPTICAL SCINTILLATIONS; ATMOSPHERIC-TURBULENCE; DISTRIBUTIONS; MODEL; PROPAGATION; SIMULATION; RICIAN; Optics

    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 C-n(2), and, hence, different values of the coherence radius rho(0). 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 rho(0). For apertures larger than or equal to rho(0), the irradiance fluctuations appear to be LN distributed. (c) 2007 Optical Society of America.

    Journal Title

    Applied Optics

    Volume

    46

    Issue/Number

    11

    Publication Date

    1-1-2007

    Document Type

    Article

    Language

    English

    First Page

    2099

    Last Page

    2108

    WOS Identifier

    WOS:000245317000020

    ISSN

    1559-128X

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