8 August 2016 Focal-plane wavefront sensing for active optics in the VST based on an analytical optical aberration model
Author Affiliations +
We study a novel focal plane wavefront sensing and active optics control scheme at the VST on Cerro Paranal, an f/5.5 survey telescope with a 1x1 degree field of view and a 2.6m primary mirror. This scheme analyzes the elongation pattern of stellar PSFs across the full science image (256 Mpixels) and compares their second moments with an analytical model based on 5th-order geometrical optics. We consider 11 scalar degrees of freedom in mirror misalignments and deformations (M2 piston, tip/tilt and lateral displacement, detector tip/tilt, plus M1 figure astigmatism and trefoil). Using a numerical optimization method, we extract up to 4000 stars and complete the fitting process in under one minute. We demonstrate successful closed-loop active optics control based on maximum likelihood filtering.
© (2016) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
R. Holzlöhner, R. Holzlöhner, S. Taubenberger, S. Taubenberger, A. P. Rakich, A. P. Rakich, L. Noethe, L. Noethe, P. Schipani, P. Schipani, K. Kuijken, K. Kuijken, } "Focal-plane wavefront sensing for active optics in the VST based on an analytical optical aberration model", Proc. SPIE 9906, Ground-based and Airborne Telescopes VI, 99066E (8 August 2016); doi: 10.1117/12.2234398; https://doi.org/10.1117/12.2234398


Ground layer correction: the heart of LINC-NIRVANA
Proceedings of SPIE (July 20 2014)
First on-sky results with ARGOS at LBT
Proceedings of SPIE (July 26 2016)
VST project: the adapter rotator (M1 cell)
Proceedings of SPIE (February 03 2003)
Experiences operating CFHT's adaptive optics system
Proceedings of SPIE (September 10 1998)
ESO VLT: status of the main 8-meters telescopes
Proceedings of SPIE (May 31 1994)

Back to Top