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Proceedings Paper

Fringe tracking with noisy interferometric data
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Paper Abstract

In ground based interferometric observations, fringe stabilization over long integration times is a mandatory task in order to achieve useful performances even on faint sources. This is done by dedicated instruments which search the maximum of the fringe envelope and consequently correct the optical path of the interfering beams. Localization of the fringe maximum position is corrupted by noise coming both from turbulent atmosphere and instruments. Atmospheric fluctuations are corrected at telescope level, but high frequency disturbance, as well as inter-telescope one, still remain. These residuals must be recognized and separated from the source signal, in order to properly model the instrument behaviour. Moreover, algorithms for fringe tracking must be strong enough to tolerate residual noise and instrument model inaccuracy. We provide some examples of noise performance of both calibration and fringe maximum localization based on laboratory experiments.

Paper Details

Date Published: 7 June 2007
PDF: 8 pages
Proc. SPIE 6603, Noise and Fluctuations in Photonics, Quantum Optics, and Communications, 66032H (7 June 2007); doi: 10.1117/12.752831
Show Author Affiliations
Donata Bonino, INAF, Osservatorio Astronomico di Torino (Italy)
Univ. degli studi di Torino (Italy)
Mario Gai, INAF, Osservatorio Astronomico di Torino (Italy)
Leonardo Corcione, INAF, Osservatorio Astronomico di Torino (Italy)

Published in SPIE Proceedings Vol. 6603:
Noise and Fluctuations in Photonics, Quantum Optics, and Communications
Leon Cohen, Editor(s)

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