Experimental characterization of the turbulence inside the dome and in the surface layer

Aziz Ziad; Dali-Ali Wassila; Julien Borgnino; Marc Sarazin

doi:10.1117/12.926887

17 September 2012 Experimental characterization of the turbulence inside the dome and in the surface layer

Aziz Ziad, Dali-Ali Wassila, Julien Borgnino, Marc Sarazin

Proceedings Volume 8444, Ground-based and Airborne Telescopes IV; 844431 (2012) https://doi.org/10.1117/12.926887
Event: SPIE Astronomical Telescopes + Instrumentation, 2012, Amsterdam, Netherlands

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 C²_N constant is provided from the AA structure function as in the DIMM instrument.

Citation Download Citation

Aziz Ziad, Dali-Ali Wassila, Julien Borgnino, and Marc Sarazin "Experimental characterization of the turbulence inside the dome and in the surface layer", Proc. SPIE 8444, Ground-based and Airborne Telescopes IV, 844431 (17 September 2012); https://doi.org/10.1117/12.926887

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