Journal Article

Wavefront sensing with a brightest pixel selection algorithm

A. G. Basden, R. M. Myers and E. Gendron

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 419, issue 2, pages 1628-1636
Published in print January 2012 | ISSN: 0035-8711
Published online December 2011 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2011.19825.x
Wavefront sensing with a brightest pixel selection algorithm

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Astronomical adaptive optics systems with open-loop deformable mirror control have recently come online. In these systems, the deformable mirror surface is not included in the wavefront sensor paths, and so changes made to the deformable mirror are not fed back to the wavefront sensors. This gives rise to all sorts of linearity and control issues mainly centred on one question: has the mirror taken the shape requested? Non-linearities in wavefront measurement and in the deformable mirror shape can lead to significant deviations in the mirror shape from the requested shape. Here, wavefront sensor measurements made using a brightest pixel selection method are discussed along with the implications that this has on open-loop AO systems. Discussion includes elongated laser guide star spots and also computational efficiency.

Keywords: instrumentation: adaptive optics; methods: analytical; techniques: image processing

Journal Article.  6571 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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