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IRAN: Interferometric Remapped Array Nulling

Published online by Cambridge University Press:  13 October 2006


E. Aristidi
Affiliation:
LUAN, Université de Nice, Parc Valrose, 06108 Nice Cedex 2, France
F. Vakili
Affiliation:
LUAN, Université de Nice, Parc Valrose, 06108 Nice Cedex 2, France
A. Schutz
Affiliation:
LUAN, Université de Nice, Parc Valrose, 06108 Nice Cedex 2, France
H. Lanteri
Affiliation:
LUAN, Université de Nice, Parc Valrose, 06108 Nice Cedex 2, France
L. Abe
Affiliation:
LUAN, Université de Nice, Parc Valrose, 06108 Nice Cedex 2, France
A. Belu
Affiliation:
LUAN, Université de Nice, Parc Valrose, 06108 Nice Cedex 2, France
P.M. Gori
Affiliation:
LUAN, Université de Nice, Parc Valrose, 06108 Nice Cedex 2, France
O. Lardière
Affiliation:
Observatoire de Haute Provence, France
B. Lopez
Affiliation:
Observatoire de la Côte d'Azur, France
J.L. Menut
Affiliation:
Observatoire de la Côte d'Azur, France
F. Patru
Affiliation:
Observatoire de la Côte d'Azur, France

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Abstract

IRAN is a method of beam-combination in the hypertelescope imaging technique recently introduced by Labeyrie in optical interferometry. We propose to observe the interferometric image in the pupil plane, performing multi-axial pupil plane interferometry. Imaging is performed in a combined pupil-plane where the point-source intensity distribution (PSID) tends towards a pseudo Airy disc for a sufficiently large number of telescopes. The image is concentrated into the limited support of the output pupil of the individual telescopes, in which the object-image convolution relation is conserved. Specific deconvolution algorithms have been developped for IRAN hypertelescope imagery, based upon Lucy-like iterative techniques. We show that the classical (image plane) and IRAN (pupil plane) hypertelescope imaging techniques are equivalent if one uses optical fibers for beam transportation. An application to the VLT/VIDA concept is presented.


Type
Research Article
Copyright
© EAS, EDP Sciences, 2006

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