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http://hdl.handle.net/20.500.12386/26010
Title: | Focal-plane wavefront sensing for active optics in the VST based on an analytical optical aberration model | Authors: | Holzlöhner, R. Taubenberger, S. Rakich, A. P. Noethe, L. SCHIPANI, Pietro Kuijken, K. |
Issue Date: | 2016 | Volume: | Ground-based and Airborne Telescopes VI | Editors: | Hall, Helen J.; Gilmozzi, Roberto; Marshall, Heather K. | Series: | PROCEEDINGS OF SPIE | Number: | 9906 | First Page: | 99066E | 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. | Conference Name: | Ground-based and Airborne Telescopes VI | Conference Place: | Edinburgh, United Kingdom | Conference Date: | 26 June - 1 July 2016 | URI: | http://hdl.handle.net/20.500.12386/26010 | URL: | https://www.spiedigitallibrary.org/conference-proceedings-of-spie/9906/1/Focal-plane-wavefront-sensing-for-active-optics-in-the-VST/10.1117/12.2234398.short | ISSN: | 0277-786X | ISBN: | 9781510601918 | DOI: | 10.1117/12.2234398 | Bibcode ADS: | 2016SPIE.9906E..6EH | Fulltext: | open |
Appears in Collections: | 3.01 Contributi in Atti di convegno |
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File | Description | Size | Format | |
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Edinburgh2016_VSTAO.pdf | Pdf editoriale | 1.24 MB | Adobe PDF | View/Open |
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