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Proceedings Paper

Visible point target scintillation in the Mediterranean coastal area
Author(s): Karin Weiss-Wrana
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Paper Abstract

The FGAN-FfO participated in the LAPTEX trial in Crete in July 1996. Irradiance fluctuations or scintillation of visible point targets were measured with a digital camera at frame rates up to 1000 Hz during different atmospheric turbulence conditions. One optical path with a length of 2560 m was directed parallel to the coast line crossing water as well as land. The strength of atmospheric turbulence was determined by measuring the structure constant of refractive index, Cn2, and the inner scale of turbulence, l0, with a laser scintillometer over irregular coastal rock structures. The analysis of the recorded image sequences was performed with the interactive data language IDL. The irradiance fluctuations of the target-to-background differences show a log-normal frequency of occurrence distribution. The corresponding variances in angle-of-arrival fluctuation ((alpha) 2) were determined. Calculations of the variance in angle-of-arrival fluctuation were carried out using the path-weighted structure constant of refractive index, Cn2. Theoretical values of ((alpha) 2) indicate a variation, which is an order-of- magnitude larger than the variation in the experimental values.

Paper Details

Date Published: 7 December 1998
PDF: 9 pages
Proc. SPIE 3494, Atmospheric Propagation, Adaptive Systems, and Lidar Techniques for Remote Sensing II, (7 December 1998); doi: 10.1117/12.332433
Show Author Affiliations
Karin Weiss-Wrana, FGAN-Forschungsinstitut fuer Optik (Germany)


Published in SPIE Proceedings Vol. 3494:
Atmospheric Propagation, Adaptive Systems, and Lidar Techniques for Remote Sensing II
Adam D. Devir; Anton Kohle; Ulrich Schreiber; Christian Werner, Editor(s)

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