Atmospheric inner-scale effects on normalized irradiance variance
Davis, Charles A.
Walters, D. L.
MetadataShow full item record
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.
Applied Optics, Volume 33, No. 36, 8406-8411 (20 December 1994)
Showing items related by title, author, creator and subject.
Davis, Charles A. (Monterey, California. Naval Postgraduate School, 1994-06);This research used Huygens-Fresnel wave optics computer simulations to investigate the effects of high turbulence strength and inner scale on the normalized irradiance variance and coherence length of electromagnetic waves ...
Ambrose, Charles R. (Monterey, California. Naval Postgraduate School, 1999-03-01);Atmospheric turbulence will induce phase and amplitude fluctuations in propagating electromagnetic waves, such as a laser beam. Adaptive optical systems attempt to compensate for these distortions. The Strehl ratio is a ...
Smith, Jerome A (Monterey, California. Naval Postgraduate School, 1984-03); NPS68-84-003CTD data from the California Current System (CCS) are analysed in terms of both empirical orthogonal functions (EOFs) and quasigeostrophic vertical modes (QGMs). A single EOF accounts for about 97% of the total variance ...