Experimental analysis of image quality for a horizontal overwater propagation

Details Experimental analysis of image quality for a horizontal overwater propagation Experimental analysis of image quality for a horizontal overwater propagation

Oct 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996spie.2828..244b&link_type=abstract

Proc. SPIE Vol. 2828, p. 244-255, Image Propagation through the Atmosphere, J. C. Dainty; Luc R. Bissonnette; Eds.

Physics

Scientific paper

The effect of atmospheric turbulence on the imaging of scenes, for a 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(subscript 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 area are also performed; an image motion of small spatial coherent length seems to be drawn by a horizontal wind producing wave-like distortion of horizontal lines and boiling-like of vertical ones.

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