New centroid detection algorithm for the Shack-Hartmann wavefront sensor

Details New centroid detection algorithm for the Shack-Hartmann wavefront sensor New centroid detection algorithm for the Shack-Hartmann wavefront sensor

Sep 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002spie.4926..251b&link_type=abstract

Proc. SPIE Vol. 4926, p. 251-260, Adaptive Optics and Applications II, Wenhan Jiang; Robert K. Tyson; Eds.

Physics

Optics

1

Scientific paper

A new center position detecting algorithm of the spot image for the Shack-Hartmann wavefront sensor was developed. The new algorithm is a modified center of weight algorithm, which uses some power of the grey level intensity of the spot images instead of the grey level intensity itself of the spot images. From experiments, the repeatability and accuracy of the center position detection of the spot images of the Shack-Hartmann wavefront sensor which used the new algorithm were improved compared with the conventional center position detection algorithm using the center of weight. Applications of the algorithm to measurement of the displacement of the spot images and the Shack-Hartmann wavefront sensor for measuring wavefront distortion and the experimental results of closed-loop wavefront correction are described in this paper.

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