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Proceedings Paper

New techniques for the live update of gain tables in NGS and LGS WFS operation
Author(s): Michael Oliker; Daniel Roskey
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Paper Abstract

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.

Paper Details

Date Published: 28 July 2010
PDF: 15 pages
Proc. SPIE 7736, Adaptive Optics Systems II, 773663 (28 July 2010); doi: 10.1117/12.862924
Show Author Affiliations
Michael Oliker, SAIC (United States)
Daniel Roskey, SAIC (United States)

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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