Comparison of Fourier and model-based estimators in single mode multiaxial interferometry

Abstract

There are several solutions to code the signal arising from optical long baseline multi-aperture interferometers. In this paper,we focus on the {\bf non homothetic spatial coding scheme} (multiaxial) with the fringe pattern coded along one dimension on one detector(all-in-one). After describing the physical principles governing single mode interferometers using that sort of recombination scheme, we analyze two different existing methods that measure the source visibility. The first technique, so-called Fourier estimator, consists in integrating the high frequency peak of the power spectral density of the interferogram. The second method, so-called model-based estimator, has been specifically developed for the AMBER instrument of the VLTI and deals with directly modelling the interferogram recorded on the detector. Performances of both estimators are computed in terms of Signal to Noise Ratio (SNR) of the visibility, assuming that the interferograms are perturbed by photon and detector noises. Theoretical expressions of the visibility SNR are provided, validated through numerical computations and then compared. We show that the model-based estimator offers up to 5 times better performances than the Fourier one.

arXiv comment10 pages, 5 figures. Accepted in MNRAS

References in corpus (5)

• Fringe Visibility Estimators for the Palomar Testbed Interferometer
• First results with the IOTA3 imaging interferometer: The spectroscopic binaries lambda Vir and WR 140
• Subtracting the photon noise bias from single-mode optical interferometer visibilities
• Single-Mode versus multimode interferometry: a performance study
• Fiber optic interferometry: Statistics of visibility and closure phase

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