Simplified Wavefront Sensor For Adaptive Mirror Control

Jean-Paul Gaffard; Corinne Boyer

doi:10.1117/12.960816

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20 September 1989 Simplified Wavefront Sensor For Adaptive Mirror Control

Jean-Paul Gaffard, Corinne Boyer

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Proceedings Volume 1114, Active Telescope Systems; (1989) https://doi.org/10.1117/12.960816
Event: SPIE 1989 Technical Symposium on Aerospace Sensing, 1989, Orlando, FL, United States

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.

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Jean-Paul Gaffard and Corinne Boyer "Simplified Wavefront Sensor For Adaptive Mirror Control", Proc. SPIE 1114, Active Telescope Systems, (20 September 1989); https://doi.org/10.1117/12.960816

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