New centroid computation method using dynamic tracking

Details New centroid computation method using dynamic tracking New centroid computation method using dynamic tracking

Sep 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002spie.4926..162l&link_type=abstract

Proc. SPIE Vol. 4926, p. 162-167, Adaptive Optics and Applications II, Wenhan Jiang; Robert K. Tyson; Eds.

Physics

Optics

Scientific paper

The disadvantage in expanding dynamic range and restraining noise of the traditional H-S (Harmtann-Shack) wavefront sensor centroid computation method is analyzed. Based on the temporal characteristsic of atmosphere turbulence, through determining the changing scope of centroid motion between two adjacent sample perpiods, a new dynamic tracking centroid method of H-S wavefront sensor is proposed. Using this method, the dynamic range of wavefront sensor can be expanded when atmospheric turbulence is strong; the effect of CCD readout noise and shot noise can be reduced.

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