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Proceedings Paper

Compared performance of different centroiding algorithms for high-pass filtered laser guide star Shack-Hartmann wavefront sensors
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Paper Abstract

Variations of the sodium layer altitude and atom density profile induce errors on laser-guide-star (LGS) adaptive optics systems. These errors must be mitigated by (i), optimizing the LGS wavefront sensor (WFS) and the centroiding algorithm, and (ii), by adding a high-pass filter on the LGS path and a low-bandwidth natural-guide-star WFS. In the context of the ESO E-ELT project, five centroiding algorithms, namely the centre-of-gravity (CoG), the weighted CoG, the matched filter, the quad-cell and the correlation, have been evaluated in closedloop on the University of Victoria LGS wavefront sensing test bed. Each centroiding algorithm performance is compared for a central versus side-launch laser, different fields of view, pixel sampling, and LGS flux.

Paper Details

Date Published: 12 July 2010
PDF: 15 pages
Proc. SPIE 7736, Adaptive Optics Systems II, 773627 (12 July 2010); doi: 10.1117/12.857742
Show Author Affiliations
Olivier Lardière, Univ. of Victoria (Canada)
Rodolphe Conan, Univ. of Victoria (Canada)
Richard Clare, European Organisation for Astronomical Research in the Southern Hemisphere (Germany)
Colin Bradley, Univ. of Victoria (Canada)
Norbert Hubin, European Organisation for Astronomical Research in the Southern Hemisphere (Germany)

Published in SPIE Proceedings Vol. 7736:
Adaptive Optics Systems II
Brent L. Ellerbroek; Michael Hart; Norbert Hubin; Peter L. Wizinowich, Editor(s)

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