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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 44, Iss. 25 — Sep. 1, 2005
  • pp: 5173–5179

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

Ettore Pedretti, Wesley A. Traub, John D. Monnier, Rafael Millan-Gabet, Nathaniel P. Carleton, F. Peter Schloerb, Michael K. Brewer, Jean-Philippe Berger, Marc G. Lacasse, and Sam Ragland  »View Author Affiliations


Applied Optics, Vol. 44, Issue 25, pp. 5173-5179 (2005)
http://dx.doi.org/10.1364/AO.44.005173


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Abstract

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 ~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.

© 2005 Optical Society of America

OCIS Codes
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
(120.2650) Instrumentation, measurement, and metrology : Fringe analysis
(120.3180) Instrumentation, measurement, and metrology : Interferometry

History
Original Manuscript: November 9, 2004
Revised Manuscript: March 29, 2005
Manuscript Accepted: March 31, 2005
Published: September 1, 2005

Citation
Ettore Pedretti, Wesley A. Traub, John D. Monnier, Rafael Millan-Gabet, Nathaniel P. Carleton, F. Peter Schloerb, Michael K. Brewer, Jean-Philippe Berger, Marc G. Lacasse, and Sam Ragland, "Robust determination of optical path difference: fringe tracking at the Infrared Optical Telescope Array interferometer," Appl. Opt. 44, 5173-5179 (2005)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-44-25-5173


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