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Proceedings Paper

The aggregate behavior of branch points: branch point density as a characteristic of an atmospheric turbulence simulator
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Paper Abstract

The Atmospheric Turbulence Simulator used in testing in the Atmospheric Simulation and Adaptive-optic Laboratory Test-bed at Air Force Research Laboratory, Directed Energy Directorate's Starfire Optical Range is configured based on three characteristics; Fried's parameter, r0, the Rytov number, σ2χ , and the Greenwood Frequency, fG. All three may be estimated from open loop data as a means of verifying the simulated turbulence conditions for a given test configuration. However, unlike r0 and fG, the Rytov number isn't directly calculated. Instead the scintillation index is estimated from intensity measurements. At low Rytov values, (< 0.3 - 0.4), this measurement can approximate the Rytov number, however beyond a Rytov of 0.4 this parameter becomes saturated. Branch Points begin to appear after the Rytov value exceeds 0.1. In this work the behavior of the branch point density is examined to determine its viability as another parameter for calibration our turbulence simulator.

Paper Details

Date Published: 12 August 2009
PDF: 10 pages
Proc. SPIE 7466, Advanced Wavefront Control: Methods, Devices, and Applications VII, 746606 (12 August 2009); doi: 10.1117/12.829277
Show Author Affiliations
Denis W. Oesch, Starfire Air Force Research Lab. (United States)
Darryl J. Sanchez, Starfire Air Force Research Lab. (United States)
Carolyn M. Tewksbury-Christle, Starfire Air Force Research Lab. (United States)
Patrick R. Kelly, Starfire Air Force Research Lab. (United States)


Published in SPIE Proceedings Vol. 7466:
Advanced Wavefront Control: Methods, Devices, and Applications VII
Richard A. Carreras; Troy A. Rhoadarmer; David C. Dayton, Editor(s)

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