Image quality and seeing measurements for long horizontal overwater propagation

Details Image quality and seeing measurements for long horizontal overwater propagation Image quality and seeing measurements for long horizontal overwater propagation

Jan 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997papop...6...15b&link_type=abstract

Pure and Applied Optics, Volume 6, Issue 1, pp. 15-30 (1997).

Physics

Optics

2

Scientific paper

The effect of atmospheric turbulence on the imaging of scenes, for horizontal propagation of the light over a distance of 20 km, 15 m above the sea surface, was analysed at visible wavelengths using a 20 cm telescope. Point-source images were recorded during the night, and the Fried parameter 0963-9659/6/1/004/img1 was derived using several methods, leading to 0963-9659/6/1/004/img1 values ranging from 2 to 4 cm depending on observing conditions. 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 a horizontal wind producing a wave-like distortion of horizontal lines and a boiling-like distortion of vertical ones.

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