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

Olivier Lardière; Rodolphe Conan; Richard Clare; Colin Bradley; Norbert Hubin

doi:10.1117/12.857742

12 July 2010 Compared performance of different centroiding algorithms for high-pass filtered laser guide star Shack-Hartmann wavefront sensors

Olivier Lardière, Rodolphe Conan, Richard Clare, Colin Bradley, Norbert Hubin

Author Affiliations +

Proceedings Volume 7736, Adaptive Optics Systems II; 773627 (2010) https://doi.org/10.1117/12.857742
Event: SPIE Astronomical Telescopes + Instrumentation, 2010, San Diego, California, United States

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.

Citation Download Citation

Olivier Lardière, Rodolphe Conan, Richard Clare, Colin Bradley, and Norbert Hubin "Compared performance of different centroiding algorithms for high-pass filtered laser guide star Shack-Hartmann wavefront sensors", Proc. SPIE 7736, Adaptive Optics Systems II, 773627 (12 July 2010); https://doi.org/10.1117/12.857742

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