13 September 2012 Design of a truth sensor for the GMT laser tomography adaptive optics system
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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, Marcos A. van Dam, Rodolphe Conan, Rodolphe Conan, Antonin H. Bouchez, Antonin H. Bouchez, Brady Espeland, 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); doi: 10.1117/12.923198; https://doi.org/10.1117/12.923198


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