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Proceedings Paper

CFHT MegaCam control system: new solutions based on PLCs, WorldFIP fieldbus and Java softwares
Author(s): Jean Yves Rousse; Olivier Boulade; Xavier Charlot; P. Abbon; Stephan Aune; Pierre Borgeaud; Pierre-Henri Carton; M. Carty; J. Da Costa; H. Deschamps; D. Desforge; Dominique Eppele; Pascal Gallais; L. Gosset; Remy Granelli; Michel Gros; Jean de Kat; Denis Loiseau; J. L. Ritou; Pierre Starzynski; Nicolas Vignal; Laurent G. Vigroux
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Paper Abstract

MegaCam is a wide-field imaging camera built for the prime focus of the 3.6m Canada-France-Hawaii Telescope. This large detector has required new approaches from the hardware up to the instrument control system software. Safe control of the three sub-systems of the instrument (cryogenics, filters and shutter), measurement of the exposure time with an accuracy of 0.1%, identification of the filters and management of the internal calibration source are the major challenges that are taken up by the control system. Another challenge is to insure all these functionalities with the minimum space available on the telescope structure for the electrical hardware and a minimum number of cables to keep the highest reliability. All these requirements have been met with a control system which different elements are linked by a WorldFip fieldbus on optical fiber. The diagnosis and remote user support will be insured with an Engineering Control System station based on software developed on Internet JAVA technologies (applets, servlets) and connected on the fieldbus.

Paper Details

Date Published: 7 March 2003
PDF: 11 pages
Proc. SPIE 4841, Instrument Design and Performance for Optical/Infrared Ground-based Telescopes, (7 March 2003); doi: 10.1117/12.461002
Show Author Affiliations
Jean Yves Rousse, CEA Saclay (France)
Olivier Boulade, CEA Saclay (France)
Xavier Charlot, CEA Saclay (France)
P. Abbon, CEA Saclay (France)
Stephan Aune, CEA Saclay (France)
Pierre Borgeaud, CEA Saclay (France)
Pierre-Henri Carton, CEA Saclay (France)
M. Carty, CEA Saclay (France)
J. Da Costa, CEA Saclay (France)
H. Deschamps, CEA Saclay (France)
D. Desforge, CEA Saclay (France)
Dominique Eppele, CEA Saclay (France)
Pascal Gallais, CEA Saclay (France)
L. Gosset, CEA Saclay (France)
Remy Granelli, CEA Saclay (France)
Michel Gros, CEA Saclay (France)
Jean de Kat, CEA Saclay (France)
Denis Loiseau, CEA Saclay (France)
J. L. Ritou, CEA Saclay (France)
Pierre Starzynski, CEA Saclay (France)
Nicolas Vignal, CEA Saclay (France)
Laurent G. Vigroux, CEA Saclay (France)

Published in SPIE Proceedings Vol. 4841:
Instrument Design and Performance for Optical/Infrared Ground-based Telescopes
Masanori Iye; Alan F. M. Moorwood, Editor(s)

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