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Proceedings Paper

Optimization of the observations of the high angular resolution techniques (adaptive optics and interferometry)
Author(s): Jerome Maire; Aziz Ziad; Julien Borgnino; Francois Martin; Denis Mourard
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Paper Abstract

Atmospheric turbulence reduces severely the angular resolution of ground based telescopes and degrades the performances of High Angular Resolution techniques (Interferometry and Adaptive Optics). These observing methods require a better understanding of the behavior of the perturbed wavefronts, more exactly a better knowledge of the atmospheric turbulence model and the associate parameters. Indeed, the performance of an Adaptive Optics system (AO) depends upon the seeing conditions (seeing, outer scale, isoplanatic angle and wavefront coherence time). For interferometric observations, atmospheric turbulence introduces random phase variations above each telescope. The resulting variable optical path difference between the interferometer arms produces fringe displacements across the detector, which results in a blurring of the fringe pattern and therefore a degradation of the fringe contrast observed. We describe, here, a seeing measurement of the spatial coherence outer scale and the wavefront coherence diameter from interferometric data. First results obtained with the GI2T ("Grand Interferometre a 2 Telescopes") interferometer at the Calern Observatory are presented and compared to those measured directly and simultaneously with the GSM ("Generalized Seeing Monitor").

Paper Details

Date Published: 25 October 2004
PDF: 8 pages
Proc. SPIE 5490, Advancements in Adaptive Optics, (25 October 2004); doi: 10.1117/12.562957
Show Author Affiliations
Jerome Maire, LUAN, CNRS and Univ. de Nice Sophia Antipolis (France)
Aziz Ziad, LUAN, CNRS and Univ. de Nice Sophia Antipolis (France)
Julien Borgnino, LUAN, CNRS and Univ. de Nice Sophia Antipolis (France)
Francois Martin, LUAN, CNRS and Univ. de Nice Sophia Antipolis (France)
Denis Mourard, GEMINI, CNRS and Observatoire de la Cote d'Azur (France)


Published in SPIE Proceedings Vol. 5490:
Advancements in Adaptive Optics
Domenico Bonaccini Calia; Brent L. Ellerbroek; Roberto Ragazzoni, Editor(s)

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