Implementation of SLODAR atmospheric turbulence profiling to the ARGOS system

Tommaso Mazzoni; Lorenzo Busoni; Marco Bonaglia; Simone Esposito

doi:10.1117/12.2057609

22 August 2014 Implementation of SLODAR atmospheric turbulence profiling to the ARGOS system

Tommaso Mazzoni, Lorenzo Busoni, Marco Bonaglia, Simone Esposito

Proceedings Volume 9148, Adaptive Optics Systems IV; 91486A (2014) https://doi.org/10.1117/12.2057609
Event: SPIE Astronomical Telescopes + Instrumentation, 2014, Montréal, Quebec, Canada

Abstract

ARGOS is the Ground Layer Adaptive Optics system of the Large Binocular Telescope, it uses three Laser Guide Stars at 12 km altitude, generated by Rayleigh backscattered light of pulsed Nd:YAG lasers at 532nm. The wavefront distortion in the Ground Layer is measured by three Shack-Hartmann WFS, sampling with 15×15 subaperture the three LGS arranged on a single CCD with 8×8px per square subaperture. The SLOpe Detection And Ranging (SLODAR) is a method used to measure the turbulence profiles. Cross correlation of wavefronts gradient from multiple stars is used to estimate the relative strengths of turbulent layers at different altitudes. In the ARGOS case the LGS are arranged on a triangle inscribed in a 2 arcmin radius circle, so we expect an effective slopes correlation up to 5km altitude. We present here the results of a study aimed to implement the SLODAR method on ARGOS performed with the idl-based simulation code used to characterize the ARGOS performance. Simulation implements the atmospheric turbulence on different layers with variable strength, altitude and wind speed. The algorithm performance are evaluated comparing the input turbulence with the cross-correlation of the SH slopes acquired in open loop.

Citation Download Citation

Tommaso Mazzoni, Lorenzo Busoni, Marco Bonaglia, and Simone Esposito "Implementation of SLODAR atmospheric turbulence profiling to the ARGOS system", Proc. SPIE 9148, Adaptive Optics Systems IV, 91486A (22 August 2014); https://doi.org/10.1117/12.2057609

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KEYWORDS

Turbulence

Telescopes

Profiling

Adaptive optics

Atmospheric turbulence

Wavefront sensors

Wavefronts

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