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A&A 425, 1161-1174 (2004)
DOI: 10.1051/0004-6361:20034562
Data reduction methods for single-mode optical interferometry
Application to the VLTI two-telescopes beam combiner VINCI
P. Kervella1, 2, D. Ségransan3 and V. Coudé du Foresto11 LESIA, UMR 8109, Observatoire de Paris-Meudon, 5 Pl. Jules Janssen, 92195 Meudon Cedex, France
e-mail: Pierre.Kervella@obspm.fr
2 European Southern Observatory, Alonso de Cordova 3107, Casilla 19001, Santiago 19, Chile
3 Observatoire de Genève, 51 Ch. des Maillettes, 1290 Sauverny, Switzerland
(Received 22 October 2003 / Accepted 14 June 2004)
Abstract
The interferometric data processing methods that we describe
in this paper use a number of innovative techniques. In particular, the
implementation of the wavelet transform allows us to obtain a
good immunity of the fringe processing to false detections and
large amplitude perturbations by the atmospheric piston effect,
through a careful, automated selection of the interferograms.
To demonstrate the data reduction procedure,
we describe the processing and calibration of a sample of stellar data from
the VINCI beam combiner. Starting from the raw data, we
derive the angular diameter of the dwarf star
Cen A.
Although these methods have been developed specifically for VINCI,
they are easily applicable to other single-mode beam combiners, and
to spectrally dispersed fringes.
Key words: techniques: interferometric -- methods: data analysis -- instrumentation: interferometers
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