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13 September 2012 Design of a truth sensor for the GMT laser tomography adaptive optics system
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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.
© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Marcos A. van Dam, Rodolphe Conan, Antonin H. Bouchez, and Brady Espeland "Design of a truth sensor for the GMT laser tomography adaptive optics system", Proc. SPIE 8447, Adaptive Optics Systems III, 844717 (13 September 2012); https://doi.org/10.1117/12.923198
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