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Proceedings Paper

Design of a truth sensor for the GMT laser tomography adaptive optics system
Author(s): Marcos A. van Dam; Rodolphe Conan; Antonin H. Bouchez; Brady Espeland
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Paper Abstract

The GMT laser tomography adaptive optics (LTAO) system design has a truth sensor guiding on a natural guide star. The truth sensor is used to measure telescope segment piston errors and measure slowly varying non- common path aberrations. The challenge lies in measuring segment piston using faint natural guide stars and the wavefront delivered by the LTAO system. This requires a sensor that can make a direct phase measurement. It is demonstrated that an infrared, AO-corrected, unmodulated pyramid or roof wavefront sensor can make the required measurements at 10 Hz for stars brighter than magnitude 17 at H- or K-band.

Paper Details

Date Published: 13 September 2012
PDF: 11 pages
Proc. SPIE 8447, Adaptive Optics Systems III, 844717 (13 September 2012); doi: 10.1117/12.923198
Show Author Affiliations
Marcos A. van Dam, Flat Wavefronts (New Zealand)
Rodolphe Conan, Research School of Astronomy and Astrophysics, The Australian National Univ. (Australia)
Antonin H. Bouchez, Giant Magellan Telescope Organization Corp. (United States)
Brady Espeland, Research School of Astronomy and Astrophysics, The Australian National Univ. (Australia)


Published in SPIE Proceedings Vol. 8447:
Adaptive Optics Systems III
Brent L. Ellerbroek; Enrico Marchetti; Jean-Pierre Véran, Editor(s)

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