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Proceedings Paper

Experiment to characterize optical turbulence along a 2.33 km free-space laser path via differential image motion measurements
Author(s): Arnold Tunick
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Paper Abstract

In a previous experiment (Tunick, 2008: Optics Express 16, 14645-14654), values for the refractive index structure constant and the Fried parameter were calculated from measurements of signal intensity and angle-of-arrival statistics based on idealized models. Calculated turbulence parameters were evaluated in comparison to scintillometer-based measurements for several cases. It was found that the idealized models alone were insufficient to accurately describe complex, non-uniform microclimate and turbulence conditions. In addition, the signal intensity and focal spot displacement measurements were quite sensitive to platform and light source jitter. In order to compensate for adverse effects such as platform vibrations, an alternative differential image motion method is explored for optical turbulence parameter characterization. Hence, further experimental research is conducted along a 2.33 km free-space laser path to capture differential image centroid data from which Fried parameter and refractive index structure constant information can be obtained. This research is intended to provide useful information for US Army laser communications, long-range imaging and energy-on-target.

Paper Details

Date Published: 12 August 2009
PDF: 6 pages
Proc. SPIE 7463, Atmospheric Optics: Models, Measurements, and Target-in-the-Loop Propagation III, 746303 (12 August 2009); doi: 10.1117/12.823969
Show Author Affiliations
Arnold Tunick, U.S. Army Research Lab. (United States)

Published in SPIE Proceedings Vol. 7463:
Atmospheric Optics: Models, Measurements, and Target-in-the-Loop Propagation III
Stephen M. Hammel; Alexander M. J. van Eijk; Mikhail A. Vorontsov, Editor(s)

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