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Proceedings Paper

Fringe tracking using a priori information on the optical path difference drift
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Paper Abstract

Our goal is to improve fringe tracking in ground-based Michelson interferometry in order to reach fainter limiting magnitudes, and lower fringe visibility thresholds. The classical technique is the Fourier analysis of dispersed fringes (peak detection). It can be regarded as a maximum likelihood estimator. Although such an estimator is optimal by complying with Cramér-Rao bound rule, it does not use a priori information about the optical path difference (OPD) to be measured. We introduce a new signal analysis procedure based on the OPD drifts measured at the GI2T interferometer: if the signal is autocorrelated, then it would be possible to use a linear estimator giving a likelihood function from previous OPD values, reducing the noise in fringe Fourier analysis. Keywords: fringe tracking, photon counting, Fourier analysis, autoregressive modeling

Paper Details

Date Published: 24 July 1998
PDF: 8 pages
Proc. SPIE 3350, Astronomical Interferometry, (24 July 1998); doi: 10.1117/12.317174
Show Author Affiliations
Sebastien Morel, Observatoire Midi-Pyrenees (Germany)
Laurent Koechlin, Observatoire Midi-Pyrenees (France)


Published in SPIE Proceedings Vol. 3350:
Astronomical Interferometry
Robert D. Reasenberg, Editor(s)

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