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Proceedings Paper

The performance of the calibration module for SPHERE
Author(s): François P. Wildi; Bernard Michaud; Michel Crausaz; Rene Dubosson; David Mouillet; Kjetil Dohlen; Hans-Martin Schmid; Jean-Luc Beuzit
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Paper Abstract

One of the main challenges to obtain the contrast of >15mag targeted by the extra-solar planet imager SPHERE lies in the calibration of all the different elements participating in the final performance. The Adaptive Optics (AO) system and its three embedded loops, the coronagraphs, the Near Infrared (NIR) dual band imager, the NIR integral field spectrograph, the NIR spectrograph, the visible high accuracy polarimeter and the visible imager all require sophisticated calibration. The calibration process relies on a specific complex calibration module that provides the different sources across the spectrum (500-2320nm) with the stabilities and precisions required and positions them when the need to be. This calibration module has just passed all verification tests and its performance is now well characterized. Its design and performance is the object of this article.

Paper Details

Date Published: 15 July 2010
PDF: 9 pages
Proc. SPIE 7735, Ground-based and Airborne Instrumentation for Astronomy III, 77352V (15 July 2010); doi: 10.1117/12.857949
Show Author Affiliations
François P. Wildi, Observatoire Astronomique de l'Univ. de Genève (Switzerland)
Bernard Michaud, Observatoire Astronomique de l'Univ. de Genève (Switzerland)
Michel Crausaz, Observatoire Astronomique de l'Univ. de Genève (Switzerland)
Rene Dubosson, Observatoire Astronomique de l'Univ. de Genève (Switzerland)
David Mouillet, Lab. d'Astrophysique de l'Observatoire de Grenoble, CNRS, Univ. Joseph Fourier (France)
Kjetil Dohlen, Lab. d'Astrophysique de Marseille, CNRS, Univ. de Provence (France)
Hans-Martin Schmid, ETH Zürich (Switzerland)
Jean-Luc Beuzit, Lab. d'Astrophysique de l'Observatoire de Grenoble, CNRS, Univ. Joseph Fourier (France)


Published in SPIE Proceedings Vol. 7735:
Ground-based and Airborne Instrumentation for Astronomy III
Ian S. McLean; Suzanne K. Ramsay; Hideki Takami, Editor(s)

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