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Proceedings Paper

Fast active optics control of wide-field telescopes based on science image analysis
Author(s): R. Holzlöhner; A. Rakich; L. Noethe; K. Kuijken; P. Schipani
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Paper Abstract

We study a novel 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 the star PSFs across the full science image (267 Mpixels) and compares their second moments with an analytical model based on 5th-order geometrical optics, comprising 9 degrees of freedom in mirror misalignments and deformations. Using a numerical optimization method, we can complete the star extraction and fitting process in under one minute, fast enough for effective closed-loop active optics control in survey observing cadences.

Paper Details

Date Published: 7 August 2014
PDF: 15 pages
Proc. SPIE 9151, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation, 91512I (7 August 2014); doi: 10.1117/12.2056121
Show Author Affiliations
R. Holzlöhner, European Southern Observatory (Germany)
A. Rakich, European Southern Observatory (Germany)
L. Noethe, European Southern Observatory (Germany)
K. Kuijken, Leiden Observatory (Netherlands)
P. Schipani, INAF - Osservatorio Astronomico di Capodimonte (Italy)

Published in SPIE Proceedings Vol. 9151:
Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation
Ramón Navarro; Colin R. Cunningham; Allison A. Barto, Editor(s)

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