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Communication Dans Un Congrès Année : 1996

Experimental analysis of image quality for an horizontal overwater propagation

Résumé

The effect of atmospheric turbulence on the imaging of scenes, for an horizontal propagation of the light over a distance of 20 km, 15 meters above the sea surface, was analyzed at visible wavelength using a 20 cm telescope. Point-sources images were recorded during the night, and the Fried parameter r 0 was derived leading to values ranging from 1.5 to 3.6 cm. A very high level of scintillation was observed. Studies of correlations between close-by sources lead to a very small domain of isoplanatism. Daytime observations of an extended source are also performed; an image motion of small spatial coherent length seems to be drawn by an horizontal wind producing wave-like distortion of horizontal lines and boiling-like of vertical ones.
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Dates et versions

hal-02480011 , version 1 (14-02-2020)

Identifiants

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Hubert Beaumont, Claude Aime, Eric Aristidi, Henri Lanteri. Experimental analysis of image quality for an horizontal overwater propagation. SPIE's 1996 International Symposium on Optical Science, Engineering, and Instrumentation, 1996, Denver, United States. pp.244, ⟨10.1117/12.254172⟩. ⟨hal-02480011⟩
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