Title

Aperture Averaging Of Optical Scintillations: Power Fluctuations And The Temporal Spectrum

Abstract

Using a recently developed theory of scintillation that is valid under all fluctuation conditions, including the focussing and saturation regimes, we develop general models for predicting power fluctuations (or aperture averaging) over finite-size collecting apertures. Inner-scale effects are introduced using a modified atmospheric spectrum for refractive-index fluctuations that includes a high-wavenumber bump. Where comparisons can be made, these models of aperture averaging are in good agreement with previous asymptotic models and experimental data. In addition to the aperture-averaging factor, we calculate the temporal spectrum associated with power fluctuations over various aperture sizes and conditions of turbulence. These later results clearly show the transfer of power distribution from high to low frequencies as the size of the collecting aperture is increased. The transfer of power is more pronounced in the saturation regime where high frequencies (fastest fluctuations) can be averaged out even for relatively small apertures. © 2000 IOP Publishing Ltd.

Publication Date

1-1-2000

Publication Title

Waves Random Media

Volume

10

Issue

1

Number of Pages

53-70

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1088/0959-7174/10/1/305

Socpus ID

0033895639 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/0033895639

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