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Proceedings Paper

The OmegaCAM real-time image analysis system
Author(s): Konrad Kuijken; Andrea Baruffolo; Paolo Bagnara; Carlo Magagna
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Paper Abstract

OmegaCAM, the wide-field CCD camera for the VLT Survey Telescope, will have an on-line image analysis system, the design of which will be described here. Aim of the system is to provide continuous, real-time image aberration coefficients that can be used to correct the telescope primary mirror figure, and the secondary mirror position and attitude. Wavefront sensing is performed using a curvature-like system, which consists of two CCDs mounted out of focus (one in front, one behind focus) in the outer part of the focal plane. During observations short exposures of bright guide stars are continuously read out, the defocussed images are then decomposed into terms that correspond to wavefront aberrations. The optical design of the wavefront sensor, the image analysis algorithm and software, and system operations will be described.

Paper Details

Date Published: 30 September 2004
PDF: 6 pages
Proc. SPIE 5492, Ground-based Instrumentation for Astronomy, (30 September 2004); doi: 10.1117/12.550920
Show Author Affiliations
Konrad Kuijken, Univ. Leiden Observatory (Netherlands)
Andrea Baruffolo, INAF, Osservatorio Astronomico di Padova (Italy)
Paolo Bagnara, INAF, Osservatorio Astronomico di Padova (Italy)
Carlo Magagna, INAF, Osservatorio Astronomico di Padova (Italy)


Published in SPIE Proceedings Vol. 5492:
Ground-based Instrumentation for Astronomy
Alan F. M. Moorwood; Masanori Iye, Editor(s)

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