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Proceedings Paper

Simplified Wavefront Sensor For Adaptive Mirror Control
Author(s): Jean-Paul Gaffard; Corinne Boyer
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Paper Abstract

Most of the adaptive optics experimented for astronomy uses a Shack-Hartmann wavefront sensor. By their principle these sensors require a large amount of real time calculations. The time spent to perform these calculations may become a limiting factor of the bandwidth. It should be probably the case for the mirrors with high numbers of actuators which will be built for the very large telescope projects. Recently, F. Roddier has proposed an analog curvature sensing method which could theoritically avoid any calculations. We will demonstrate that optical filterings which transform wavefront distorsions in intensity modulations can be used with a reasonable amount of calculations to perform the control of an adaptive optical system. Some of these filtering which permits differential measurements offers the possibility to eliminate the inexpected speckle intensity modulations.

Paper Details

Date Published: 20 September 1989
PDF: 17 pages
Proc. SPIE 1114, Active Telescope Systems, (20 September 1989); doi: 10.1117/12.960816
Show Author Affiliations
Jean-Paul Gaffard, Laboratoires de Marcoussis (France)
Corinne Boyer, Laboratoires de Marcoussis (France)

Published in SPIE Proceedings Vol. 1114:
Active Telescope Systems
Francois J. Roddier, Editor(s)

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