Accurate measurement of Cn2 profile with Shack-Hartmann data

Juliette Voyez; Clélia Robert; Vincent Michau; Jean-Marc Conan; Thierry Fusco

doi:10.1117/12.925356

13 September 2012 Accurate measurement of Cn2 profile with Shack-Hartmann data

Juliette Voyez, Clélia Robert, Vincent Michau, Jean-Marc Conan, Thierry Fusco

Proceedings Volume 8447, Adaptive Optics Systems III; 844759 (2012) https://doi.org/10.1117/12.925356
Event: SPIE Astronomical Telescopes + Instrumentation, 2012, Amsterdam, Netherlands

Abstract

The precise reconstruction of the turbulent volume is a key point in the development of new-generation Adaptive Optics systems. We propose a new C²_n profilometry method named CO-SLIDAR (COupled Slope and scIntillation Detection And Ranging), that uses correlations of slopes and scintillation indexes recorded on a Shack-Hartmann from two separated stars. CO-SLIDAR leads to an accurate C²_n retrieval for both low and high altitude layers. Here, we present an end-to-end simulation of the C²_n profile measurement. Two Shack-Hartmann geometries are considered. The detection noises are taken into account and a method to subtract the bias is proposed. Results are compared to C²_n profiles obtained from correlations of slopes only or correlations of scintillation indexes only.

Citation Download Citation

Juliette Voyez, Clélia Robert, Vincent Michau, Jean-Marc Conan, and Thierry Fusco "Accurate measurement of Cn2 profile with Shack-Hartmann data", Proc. SPIE 8447, Adaptive Optics Systems III, 844759 (13 September 2012); https://doi.org/10.1117/12.925356

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