8 August 2016 Focal-plane wavefront sensing for active optics in the VST based on an analytical optical aberration model
Author Affiliations +
Abstract
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, S. Taubenberger, A. P. Rakich, L. Noethe, P. Schipani, 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
PROCEEDINGS
11 PAGES


SHARE
RELATED CONTENT

Ground layer correction: the heart of LINC-NIRVANA
Proceedings of SPIE (July 21 2014)
First on-sky results with ARGOS at LBT
Proceedings of SPIE (July 27 2016)
Performance of Subaru adaptive optics system AO188
Proceedings of SPIE (July 28 2010)
Adaptive optics: a progress review
Proceedings of SPIE (December 01 1991)
Gemini instrumentation
Proceedings of SPIE (June 01 1994)

Back to Top