Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-03-06
Astronomy and Astrophysics
Astrophysics
Accepted for publication in Applied Optics, 16 pages
Scientific paper
10.1364/AO.46.004754
Temporal fluctuations of the atmospheric piston are critical for interferometers as they determine their sensitivity. We characterize an instrumental set-up, termed the piston scope, that aims at measuring the atmospheric time constant, tau0, through the image motion in the focal plane of a Fizeau interferometer. High-resolution piston scope measurements have been obtained at the observatory of Paranal, Chile, in April 2006. The derived atmospheric parameters are shown to be consistent with data from the astronomical site monitor, provided that the atmospheric turbulence is displaced along a single direction. Piston scope measurements, of lower temporal and spatial resolution, were for the first time recorded in February 2005 at the Antarctic site of DomeC. Their re-analysis in terms of the new data calibration sharpens the conclusions of a first qualitative examination.
Butterley Tim
Kellerer Aglae
Sarazin Marc
Wilson Raymond
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