Atmospheric inner-scale effects on normalized irradiance variance
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Authors
Davis, Charles A.
Walters, D. L.
Subjects
Atmospheric optics
laser propagation
propagation simulation
irradiance fluctuations
laser propagation
propagation simulation
irradiance fluctuations
Advisors
Date of Issue
1994-12
Date
1994-12
Publisher
Language
Abstract
We have investigated five types of atmospheric optical-turbulence inner scales for their effects on
normalized laser irradiance variance in the Rytov and early saturation regimes: (1) zero inner scale, (2)
Gaussian inner scale, (3) Hill's viscous-convective enhancement inner scale, (4) Frehlich's parameterization
of the viscous-convective enhancement, and (5) turbulence spectrum truncation because of the
discrete grid representation. Wave-optics computer simulations yielded normalized irradiance variances
within 2% of the results from numerical integrations of the Rytov-Tatarskii predictions. In the Rytov
regime a Gaussian inner scale reduces the normalized irradiance variance compared with the zero-innerscale
case, and the viscous-convective inner scale first raises, then lowers the irradiance variance as the
inner-scale size increases. In the saturation regime all inner-scale models increase the intensity variance
for a spherical wave.
Type
Description
Applied Optics, Volume 33, No. 36, 8406-8411 (20 December 1994)
Series/Report No
Department
Department of Physics
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This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.