Visible point target scintillation in the Mediterranean coastal area

Karin Weiss-Wrana

doi:10.1117/12.332433

7 December 1998 Visible point target scintillation in the Mediterranean coastal area

Karin Weiss-Wrana

Proceedings Volume 3494, Atmospheric Propagation, Adaptive Systems, and Lidar Techniques for Remote Sensing II; (1998) https://doi.org/10.1117/12.332433
Event: Remote Sensing, 1998, Barcelona, Spain

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, C_n², 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, C_n². Theoretical values of ((alpha) ²) indicate a variation, which is an order-of- magnitude larger than the variation in the experimental values.

Citation Download Citation

Karin Weiss-Wrana "Visible point target scintillation in the Mediterranean coastal area", Proc. SPIE 3494, Atmospheric Propagation, Adaptive Systems, and Lidar Techniques for Remote Sensing II, (7 December 1998); https://doi.org/10.1117/12.332433

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KEYWORDS

Turbulence

Atmospheric turbulence

Refractive index

Scintillation

Ocean optics

CCD cameras

Atmospheric propagation

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