&lt;title&gt;Prototype for the European Southern Observatory VLTI fringe sensor&lt;/title&gt;

Rabbia, Yves; Ménardi, Serge; Gay, J.; Bourlon, P.; Antonelli, P.; Dugué, M.; Marchal, J.; Reynaud, François; Faucherre, M.; Hubin, N.

doi:10.1117/12.177241

Cited by 3 publications

(3 citation statements)

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“…Several systems have been proposed since then, for correcting the optical path. 25,26 GDT (also called dispersed fringe tracking when applied to image plane interferometry) has been routinely used at several interferometric facilities. [27][28][29] In fact, at IOTA, GDT was selected as the original method of path difference monitoring in the visible, [30][31][32][33] but the system was set aside in favor of making infrared observations.…”

Section: A Tracking the Fringe Packet Using Double Fourier Interferom...mentioning

confidence: 99%

Robust determination of optical path difference: fringe tracking at the Infrared Optical Telescope Array interferometer

Pedretti¹,

Traub²,

Monnier

et al. 2005

Appl. Opt.

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We describe the fringe-packet tracking system used to equalize the optical path lengths at the Infrared Optical Telescope Array interferometer. The measurement of closure phases requires obtaining fringes on three baselines simultaneously. This is accomplished by use of an algorithm based on double Fourier interferometry for obtaining the wavelength-dependent phase of the fringes and a group-delay tracking algorithm for determining the position of the fringe packet. A comparison of data acquired with and without the fringe-packet tracker shows a factor of approximately 3 reduction of the error in the closure-phase measurement. The fringe-packet tracker has been able so far to track fringes with signal-to-noise ratios as low as 1.8 for stars as faint as mH = 7.0.

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Section: A Tracking the Fringe Packet Using Double Fourier Interferom...mentioning

confidence: 99%

Robust determination of optical path difference: fringe tracking at the Infrared Optical Telescope Array interferometer

Pedretti¹,

Traub²,

Monnier

et al. 2005

Appl. Opt.

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“…Labeyrie [14] used the same system and demonstrated fringe acquisition on a two-telescope interferometer. Several systems have been proposed since then, for correcting the optical path [15,16]. GDT (also called dispersed fringe tracking when applied to image plane interferometry) has been routinely used at several interferometric facilities [17,18,19].…”

Section: Related Researchmentioning

confidence: 99%

Adaptive DFT-Based Interferometer Fringe Tracking

Wilson

Pedretti

Bregman

et al. 2005

EURASIP J. Adv. Signal Process.

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An automatic interferometer fringe tracking system has been developed, implemented, and tested at the Infrared Optical Telescope Array (IOTA) Observatory at Mount Hopkins, Arizona. The system can minimize the optical path differences (OPDs) for all three baselines of the Michelson stellar interferometer at IOTA. Based on sliding window discrete Fourier-transform (DFT) calculations that were optimized for computational efficiency and robustness to atmospheric disturbances, the algorithm has also been tested extensively on offline data. Implemented in ANSI C on the 266 MHz PowerPC processor running the VxWorks real-time operating system, the algorithm runs in approximately 2.0 milliseconds per scan (including all three interferograms), using the science camera and piezo scanners to measure and correct the OPDs. The adaptive DFT-based tracking algorithm should be applicable to other systems where there is a need to detect or track a signal with an approximately constant-frequency carrier pulse. One example of such an application might be to the field of thin-film measurement by ellipsometry, using a broadband light source and a Fourier-transform spectrometer to detect the resulting fringe patterns

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“…25,26 GDT (also called dispersed fringe tracking when applied to image plane interferometry) has been routinely used at several interferometric facilities. [27][28][29] In fact, at IOTA, GDT was selected as the original method of path difference monitoring in the visible, [30][31][32][33] but the system was set aside in favor of making infrared observations, and therefore was never extensively used.…”

mentioning

confidence: 99%