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Proceedings Paper

Experimental characterization of the turbulence inside the dome and in the surface layer
Author(s): Aziz Ziad; Dali-Ali Wassila; Julien Borgnino; Marc Sarazin
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Paper Abstract

We present the concept of a new instrument dedicated to modeling turbulence inside the dome and in the surface layer. It consists of using parallel laser beams separated by non redundant baselines between 0.1 and 2-3m and measuring Angle-of-Arrival (AA) fluctuations from spots displacements on a CCD. We use weighted least-square method to fit the measured AA longitudinal and transverse covariances with theoretical forms deduced from the usual models of turbulence. Then, the whole parameters characterizing this turbulence are provided from a complete spatio-temporal analysis of AA fluctuations. Thus, the surface layer turbulence energy in terms of C2N constant is provided from the AA structure function as in the DIMM instrument.

Paper Details

Date Published: 17 September 2012
PDF: 9 pages
Proc. SPIE 8444, Ground-based and Airborne Telescopes IV, 844431 (17 September 2012); doi: 10.1117/12.926887
Show Author Affiliations
Aziz Ziad, Observatoire de la Côte d'Azur, Univ. de Nice Sophia Antipolis, CNRS (France)
Dali-Ali Wassila, Observatoire de la Côte d'Azur, Univ. de Nice Sophia Antipolis, CNRS (France)
Julien Borgnino, Observatoire de la Côte d'Azur, Univ. de Nice Sophia Antipolis, CNRS (France)
Marc Sarazin, European Southern Observatory (Germany)


Published in SPIE Proceedings Vol. 8444:
Ground-based and Airborne Telescopes IV
Larry M. Stepp; Roberto Gilmozzi; Helen J. Hall, Editor(s)

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