New techniques for the live update of gain tables in NGS and LGS WFS operation

Details New techniques for the live update of gain tables in NGS and LGS WFS operation New techniques for the live update of gain tables in NGS and LGS WFS operation

Jul 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010spie.7736e.201o&link_type=abstract

Adaptive Optics Systems II. Edited by Ellerbroek, Brent L.; Hart, Michael; Hubin, Norbert; Wizinowich, Peter L. Proceedings o

Physics

Optics

Scientific paper

The gain in Hartmann sensors varies if the shape of the guide star varies. For Natural Guide Star (NGS) operation, this can be an extended object which changes, e.g. a Comet. For a Sodium Laser Guide Star (LGS) system the spots change if the Sodium Layer changes or r0 changes. New techniques are presented for estimating and correcting gain tables in real time AO closed loop operation. One involves looking for reference in the null space (i.e. slope discrepancy space) of the reconstruction matrix, and the other involves a new WFS output, the cross difference. These techniques are applied to NGS and LGS operation.

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