Improvements in Cn2 profile monitoring with a Shack Hartmann Wavefront sensor

Nicolas Vedrenne; Vincent Michau; Clélia Robert; Jean-Marc Conan

doi:10.1117/12.680444

1 September 2006 Improvements in C_n² profile monitoring with a Shack Hartmann wavefront sensor

Nicolas Vedrenne, Vincent Michau, Clélia Robert, Jean-Marc Conan

Proceedings Volume 6303, Atmospheric Optical Modeling, Measurement, and Simulation II; 63030C (2006) https://doi.org/10.1117/12.680444
Event: SPIE Optics + Photonics, 2006, San Diego, California, United States

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 C_n² 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 C_n² 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. C_n² 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 C_n² profile monitoring is reviewed and both techniques are tested on end to end simulation data.

Citation Download Citation

Nicolas Vedrenne, Vincent Michau, Clélia Robert, and Jean-Marc Conan "Improvements in C_n² profile monitoring with a Shack Hartmann wavefront sensor", Proc. SPIE 6303, Atmospheric Optical Modeling, Measurement, and Simulation II, 63030C (1 September 2006); https://doi.org/10.1117/12.680444

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