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Proceedings Paper

Implementation of the chromatic phase diversity method on the SIRIUS test bench
Author(s): Nassima Tarmoul; Denis Mourard; François Hénault; Jean-Michel Clausse; Paul Girard; Aurélie Marcotto; Nicolas Mauclert; Alain Spang; Yves Rabbia; Alain Roussel
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Paper Abstract

As for large interferometers, the crucial point to solve is the cophasing issue. Indeed, the cophasing device must be both efficient and independent of the number of telescopes allowing a large capture range and accurate piston measurements while being easy to implement. We developed such a cophasing method named the Chromatic Phase Diversity (CPD) method. Actually, using three spectral channels, the CPD method can determine the piston errors without ambiguity and on a range much larger than ± half a wave. This method makes it possible to work whether in coherencing mode or in cophasing mode. We designed and implemented this method on the SIRIUS test bench1 at the Observatoire de la Cote d'Azur, France. We present the instrument design, the results obtained with the CPD method. The performances such as the achieved capture range, the accuracy of the piston values extraction and the attainable magnitude are described and analyzed.

Paper Details

Date Published: 22 July 2010
PDF: 10 pages
Proc. SPIE 7734, Optical and Infrared Interferometry II, 773428 (22 July 2010); doi: 10.1117/12.856869
Show Author Affiliations
Nassima Tarmoul, Lab. H. FIZEAU, CNRS, Univ. de Nice Sophia Antipolis, Observatoire de la Côte d'Azur (France)
Denis Mourard, Lab. H. FIZEAU, CNRS, Univ. de Nice Sophia Antipolis, Observatoire de la Côte d'Azur (France)
François Hénault, Lab. H. FIZEAU, CNRS, Univ. de Nice Sophia Antipolis, Observatoire de la Côte d'Azur (France)
Jean-Michel Clausse, Lab. H. FIZEAU, CNRS, Univ. de Nice Sophia Antipolis, Observatoire de la Côte d'Azur (France)
Paul Girard, Lab. H. FIZEAU, CNRS, Univ. de Nice Sophia Antipolis, Observatoire de la Côte d'Azur (France)
Aurélie Marcotto, Lab. H. FIZEAU, CNRS, Univ. de Nice Sophia Antipolis, Observatoire de la Côte d'Azur (France)
Nicolas Mauclert, Lab. H. FIZEAU, CNRS, Univ. de Nice Sophia Antipolis, Observatoire de la Côte d'Azur (France)
Alain Spang, Lab. H. FIZEAU, CNRS, Univ. de Nice Sophia Antipolis, Observatoire de la Côte d'Azur (France)
Yves Rabbia, Lab. H. FIZEAU, CNRS, Univ. de Nice Sophia Antipolis, Observatoire de la Côte d'Azur (France)
Alain Roussel, Lab. H. FIZEAU, CNRS, Univ. de Nice Sophia Antipolis, Observatoire de la Côte d'Azur (France)


Published in SPIE Proceedings Vol. 7734:
Optical and Infrared Interferometry II
William C. Danchi; Françoise Delplancke; Jayadev K. Rajagopal, Editor(s)

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