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
Copyright Status
Unknown
Socpus ID
0033895639 (Scopus)
Source API URL
https://api.elsevier.com/content/abstract/scopus_id/0033895639
STARS Citation
Andrews, L. C., "Aperture Averaging Of Optical Scintillations: Power Fluctuations And The Temporal Spectrum" (2000). Scopus Export 2000s. 1213.
https://stars.library.ucf.edu/scopus2000/1213