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Proceedings Paper

AMBER closure and differential phases: accuracy and calibration with a beam commutation
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Paper Abstract

The first astrophysical results of the VLTI focal instrument AMBER have shown the importance of the differential and closure phase measures, which are supposed to be much less sensitive to atmospheric and instrumental biases than the absolute visibility. However there are artifacts limiting the accuracy of these measures which can be substantially overcome by a specific calibration technique called Beam Commutation. This paper reports the observed accuracies on AMBER/VLTI phases in different modes, discusses some of the instrumental biases and shows the accuracy gain provided by Beam Commutation on the Differential Phase as well as on the Closure Phase.

Paper Details

Date Published: 28 July 2008
PDF: 12 pages
Proc. SPIE 7013, Optical and Infrared Interferometry, 70131G (28 July 2008); doi: 10.1117/12.788689
Show Author Affiliations
Florentin Millour, Max-Planck Institut for Radioastronomy (Germany)
Romain G. Petrov, Fizeau Lab., Nice Univ. (France)
Martin Vannier, Fizeau Lab., Nice Univ. (France)
Stefan Kraus, Max-Planck Institut for Radioastronomy (Germany)


Published in SPIE Proceedings Vol. 7013:
Optical and Infrared Interferometry
Markus Schöller; William C. Danchi; Françoise Delplancke, Editor(s)

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