T Fusco et al 2004 J. Opt. A: Pure Appl. Opt. 6 585 doi:10.1088/1464-4258/6/6/014
T Fusco1,8, G Rousset1, D Rabaud1,2, E Gendron3, D Mouillet4,5, F Lacombe3, G Zins2,5,6, P-Y Madec1,7, A-M Lagrange5, J Charton5, D Rouan3, N Hubin6 and N Ageorges6
Show affiliationsAn on-line estimation of turbulence parameters (r0, L0 and wind speed) and adaptive optics (AO) performance is presented. The method is based on the reconstruction of open-loop data from deformable mirror voltages and residual wavefront sensor slopes obtained in closed loop. This dedicated tool implemented in the real time computer of the NAOS (Nasmyth adaptive optics system) system (first AO of the very large telescope) allows us without any loop opening to automatically monitor and display (every 15 s) both the atmospheric conditions and the system performance. We have validated the algorithm and tested its robustness on simulated and experimental data (both in the laboratory and on sky). Using data obtained over more than one year (from January 2002 to June 2003), a statistical study on NAOS performance and turbulence characteristics is proposed.
42.68.Wt Remote sensing; LIDAR and adaptive systems
92.60.Gn Winds and their effects
93.85.-q Instruments and techniques for geophysical research: Exploration geophysics
95.75.Qr Adaptive and segmented optics
95.55.Cs Ground-based ultraviolet, optical and infrared telescopes
07.07.Df Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing
42.79.Bh Lenses, prisms and mirrors
Instrumentation and measurement
Optics, quantum optics and lasers
Issue 6 (June 2004)
Received 9 January 2004, accepted for publication 30 March 2004
Published 23 April 2004
T Fusco et al 2004 J. Opt. A: Pure Appl. Opt. 6 585
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