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Proceedings Paper

Phase screens for nonturbulent optical inhomogeneities occurring in the upper troposphere and lower stratosphere
Author(s): Demos T. Kyrazis
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Paper Abstract

Other fluid dynamic phenomena, in addition to isotropic turbulence, can produce index of refraction fluctuations within the atmosphere. The stratified conditions in the upper atmosphere lead to phenomena such as thin shear layers of the order of a few hundred meters thick and few tens of kilometers in horizontal extent, as well as gravity wave action. Because of the large scale associated with these phenomena, their effects are often dismissed in optical propagation calculations since the major optical effect is assumed to be tilt. Fluid dynamic modeling of the coherent structure within a shear layer has been carried out for a simulated altitude of 12 km. The outer scale associated with this coherent structure is shown to have a dominant effect on the index of refraction structure function even when Kolmogorov turbulence is present. The phase distortion resulting through propagation within the fluid density field is determined. Results of these calculations are presented as well as the effect of these phase distortions on the energy distribution in the focal plane.

Paper Details

Date Published: 17 April 1995
PDF: 9 pages
Proc. SPIE 2375, Beam Control, Diagnostics, Standards, and Propagation, (17 April 1995); doi: 10.1117/12.207006
Show Author Affiliations
Demos T. Kyrazis, R3, Inc. (United States)

Published in SPIE Proceedings Vol. 2375:
Beam Control, Diagnostics, Standards, and Propagation
Lindsay W. Austin; Adolf Giesen; Daniel H. Leslie, Editor(s)

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