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Proceedings Paper

Optimal interferometric data acquisition and processing: towards 0.1% precision with the single-mode beam combiner VINCI
Author(s): Pierre Kervella; Vincent Coude du Foresto; Damien Segransan; Emmanuel Di Folco
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Paper Abstract

Though interferometric techniques are now used routinely around the world, the processing of interferometric data is still the subject of active research. In particular, the corruption of the interferometric fringes by the turbulent atmosphere is currently the most critical limitation to the precision of the ground-based interferometric measurements. In this paper, we discuss the data acquisition and processing procedures of the VINCI/VLTI instrument. Optimal data acquisition parameters and wavelets based processing allow us to remove a posteriori part of the data corrupted by atmospheric turbulence. A relative precision better than 0.1% on the instrumental visibility (for a 5 minutes observation) was already achieved on bright stars without fringe stabilization. Using a dedicated fringe tracker, an even better precision, of the order of a few 10-4, appears to be within reach. However, we show in this paper that the calibration of the instrumental visibility measurements can easily be the source of significant systematic errors beyond this statistical precision.

Paper Details

Date Published: 20 October 2004
PDF: 12 pages
Proc. SPIE 5491, New Frontiers in Stellar Interferometry, (20 October 2004); doi: 10.1117/12.550789
Show Author Affiliations
Pierre Kervella, LESIA, Observatoire de Paris-Meudon (France)
European Southern Observatory (Chile)
Vincent Coude du Foresto, LESIA, Observatoire de Paris-Meudon (France)
Damien Segransan, Observatoire de Geneve (Switzerland)
Emmanuel Di Folco, European Southern Observatory (Germany)

Published in SPIE Proceedings Vol. 5491:
New Frontiers in Stellar Interferometry
Wesley A. Traub, Editor(s)

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