EDP Sciences
Free access
Volume 425, Number 3, October III 2004
Page(s) 1161 - 1174
Section Instruments, observational techniques, and data processing
DOI http://dx.doi.org/10.1051/0004-6361:20034562

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 Foresto1

1  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)

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  $\alpha$ 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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