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Proceedings Paper

Fringe tracking performance monitoring: FINITO at VLTI
Author(s): A. Mérand; F. Patru; J.-P. Berger; I. Percheron; S. Poupar
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Paper Abstract

Since April 2011, realtime fringe tracking data are recorded simultaneously with data from the VLTI/AMBER interferometric beam combiner. Not only this offers possibilities to post-process AMBER reduced data to obtain more accurate interferometric quantities, it also allows to estimate the performance of the fringe tracking a function of the conditions of seeing, coherence time, flux, etc. First we propose to define fringe tracking performance metrics in the AMBER context, in particular as a function of AMBER’s integration time. The main idea is to determine the optimal exposure time for AMBER: short exposures are dominated by readout noise and fringes in long exposures are completely smeared out. Then we present this performance metrics correlated with Paranal local ASM (Ambient Site Monitor) measurements, such as seeing, coherence time or wind speed for example. Finally, we also present some preliminary results of attempts to model and predict fringe tracking performances, using Artificial Neural Networks.

Paper Details

Date Published: 12 September 2012
PDF: 8 pages
Proc. SPIE 8445, Optical and Infrared Interferometry III, 84451K (12 September 2012); doi: 10.1117/12.925450
Show Author Affiliations
A. Mérand, European Southern Observatory (Chile)
F. Patru, European Southern Observatory (Chile)
J.-P. Berger, European Southern Observatory (Chile)
I. Percheron, European Southern Observatory (Germany)
S. Poupar, European Southern Observatory (Chile)

Published in SPIE Proceedings Vol. 8445:
Optical and Infrared Interferometry III
Françoise Delplancke; Jayadev K. Rajagopal; Fabien Malbet, Editor(s)

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