Effect of atmospheric spectrum models on scintillation in moderate turbulence

    Authors

    K. J. Mayer;C. Y. Young

    Comments

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    Abbreviated Journal Title

    J. Mod. Opt.

    Keywords

    scintillation; atmospheric power spectrum modified spectrum; von Karman; spectrum; OPTICAL SCINTILLATIONS; LAYER; Optics

    Abstract

    Experimental studies have shown that a 'bump' occurs in the atmospheric spectrum just prior to turbulence cell dissipation. In weak optical turbulence, this bump affects calculated scintillation. The purpose of this study was to determine if a simpler non-bump atmospheric power spectrum can be used to model scintillation for plane waves and spherical waves in moderate to strong optical turbulence regimes. Scintillation expressions were developed from an 'effective' von Karman spectrum using an approach similar to that used by Andrews et al. in developing expressions from an effective modified (bump) spectrum. The effective spectrum extends the Rytov approximation into all optical turbulence regimes using filter functions to eliminate mid-range turbulent cell size effects to the scintillation index. Filter cutoffs were established by matching to known weak and saturated scintillation results. The resulting new expressions track those derived from the effective bump spectrum fairly closely. In extremely strong turbulence, differences are minimal.

    Journal Title

    Journal of Modern Optics

    Volume

    55

    Issue/Number

    7

    Publication Date

    1-1-2008

    Document Type

    Article

    Language

    English

    First Page

    1101

    Last Page

    1117

    WOS Identifier

    WOS:000256763900006

    ISSN

    0950-0340

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