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Proceedings Paper

Prediction Of Image Degradation Through A Turbulent Medium
Author(s): M B Richardson; R L Clark
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Paper Abstract

Aero-optically induced blur and loss of irradiance (Strehl loss) associated with imaging from an airborne vehicle can significantly limit sensor effectiveness. Increased image size caused by blurring will lengthen the time needed to accurately determine position, and a large enough Strehl loss can reduce image intensity below sensor threshold. These aero-optical effects are caused by density fluctuations that result from high-speed boundary- and shear-layer turbulence over the surface of the vehicle. The distribution of these density fluctuations determines the wavefront distortion (via refractive index fluctuations) and, therefore, determines the type and severity of the image degradation. The degree to which the image is degraded, in turn, depends upon the magnitude of the turbulent velocity fluctuations (i.e., the turbulent intensity) and the energy distribution of the turbulent eddies (i.e., the eddy spectrum).

Paper Details

Date Published: 24 August 1987
PDF: 8 pages
Proc. SPIE 0788, Flow Visualization and Aero-Optics in Simulated Environments, (24 August 1987); doi: 10.1117/12.940697
Show Author Affiliations
M B Richardson, Teledyne Brown Engineering (United States)
R L Clark, Teledyne Brown Engineering (United States)


Published in SPIE Proceedings Vol. 0788:
Flow Visualization and Aero-Optics in Simulated Environments
H. Thomas Bentley, Editor(s)

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