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Proceedings Paper

Improvements in Cn2 profile monitoring with a Shack Hartmann Wavefront sensor
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Paper Abstract

Cn2 profile monitoring usually relies on the exploitation of wavefront slopes correlations or of scintillation pattern correlations in the pupil. Scintillation is rather sensitive to high turbulence layers whereas wavefront correlations are mainly due to layers close to the receiving plane. Reaping the benefits of both phenomenon could ease Cn2 profile restoration. In the small perturbation approximation, correlations of wavefront slopes and scintillation indices recorded with a Shack Hartmann Wavefront Sensor (SHWFS) have been described analytically. We propose to apply this analytical formalism to Cn2 profile retrieval. Two measurement techniques are exposed. In CO-SLIDAR (Coupled SLODAR SCIDAR), SHWFS data recorded on a binary source are exploited to compute both autocorrelations and cross-correlations between the two components of the binary of wavefront slopes, scintillation indices and of their coupling. Cn2 profile is retrieved from the experimentally estimated correlations. SCO-SLIDAR (Single CO-SLIDAR) relies on the same principle as CO-SLIDAR but SHWFS data are recorded on a single point source. Only autocorrelations of wavefront slopes, scintillation indices and of their coupling are exploited. The analytical background of CO-SLIDAR and SCO-SLIDAR Cn2 profile monitoring is reviewed and both techniques are tested on end to end simulation data.

Paper Details

Date Published: 1 September 2006
PDF: 9 pages
Proc. SPIE 6303, Atmospheric Optical Modeling, Measurement, and Simulation II, 63030C (1 September 2006); doi: 10.1117/12.680444
Show Author Affiliations
Nicolas Vedrenne, ONERA (France)
Vincent Michau, ONERA (France)
Clélia Robert, ONERA (France)
Jean-Marc Conan, ONERA (France)

Published in SPIE Proceedings Vol. 6303:
Atmospheric Optical Modeling, Measurement, and Simulation II
Stephen M. Hammel; Anton Kohnle, Editor(s)

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