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Proceedings Paper

NAOS real-time computer for optimized closed-loop and online performance estimation
Author(s): Didier Rabaud; Frederic Chazallet; Gerard Rousset; Catherine Amra; Benoit Argast; Joseph Montri; Guillaume Dumont; Beatrice Sorrente; Pierre-Yves Madec; Eric Gendron; Robin Arsenault; David Mouillet; Norbert N. Hubin; Julien Charton
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Paper Abstract

The Real Time Computer RTC is a key component of the Nasmyth Adaptive Optics System, controlling the 185 actuators of the deformable mirror from a 144 Shack-Hartmann subapertures wavefront sensor at a maximum frequency of 500 Hz. It also provides additional capabilities such as real time optimization of the control loop which is the warranty for NAOS to achieve a very good Strehl Ratio in a broad magnitude range (Mv equals 8 up to 18), on-line turbulence and performance estimations and finally capability to store and process the data necessary to the off-line PSF reconstruction algorithm. This RTC is also designed to be easily upgraded as for Laser Guide Star. Moreover all softwares can be easily adapted to control a curvature sensor as well as the hardware which can be used with the two types of wave front sensors.

Paper Details

Date Published: 7 July 2000
PDF: 12 pages
Proc. SPIE 4007, Adaptive Optical Systems Technology, (7 July 2000); doi: 10.1117/12.390359
Show Author Affiliations
Didier Rabaud, Office National d'Etudes et de Recherches Aerospatiales (France)
Frederic Chazallet, SHAKTI (France)
Gerard Rousset, Office National d'Etudes et de Recherches Aerospatiales (France)
Catherine Amra, SHAKTI (France)
Benoit Argast, SHAKTI (France)
Joseph Montri, Office National d'Etudes et de Recherches Aerospatiales (France)
Guillaume Dumont, Office National d'Etudes et de Recherches Aerospatiales (France)
Beatrice Sorrente, Office National d'Etudes et de Recherches Aerospatiales (France)
Pierre-Yves Madec, Office National d'Etudes et de Recherches Aerospatiales (France)
Eric Gendron, Observatoire de Paris-Meudon (France)
Robin Arsenault, Observatoire de Paris-Meudon (Germany)
David Mouillet, Univ. Joseph Fourier (France)
Norbert N. Hubin, European Southern Observatory (Germany)
Julien Charton, Univ. Joseph Fourier (France)


Published in SPIE Proceedings Vol. 4007:
Adaptive Optical Systems Technology
Peter L. Wizinowich, Editor(s)

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