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Image-plane fringe tracker for adaptive-optics assisted long baseline interferometry
Author(s): Michael J. Ireland; Denis Defrère; Frantz Martinache; John D. Monnier; Barnaby Norris; Peter Tuthill; Julien Woillez
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Paper Abstract

Accurate fringe tracking is essential for sensitive long-wavelength thermal background limited operation of the current Very Large Telescope Interferometry (VLTI) and future Planet Formation Imager (PFI) facilities. We present and simulate a dual fringe tracking and low-order adaptive optics concept based on a combination of non-redundant aperture interferometry and eigenphase in asymmetric pupil wavefront sensing. This scheme can acquire fringes at many wavelengths of path length offset between telescopes, even with moderate tilt offset and pupil shifts between beams. Once locked to fringes, our technique can also be used for simultaneous low-order wavefront sensing, and has near-optimum sensitivity where there is a dominant point-source image component. This concept is part of the Heimdallr visitor instrument currently being investigated for VLTI.

Paper Details

Date Published: 9 July 2018
PDF: 10 pages
Proc. SPIE 10701, Optical and Infrared Interferometry and Imaging VI, 1070111 (9 July 2018); doi: 10.1117/12.2314393
Show Author Affiliations
Michael J. Ireland, The Australian National Univ. (Australia)
Denis Defrère, Liège Univ. (Belgium)
Frantz Martinache, Univ. Côte d'Azur, Observatoire de la Côte d'Azur, CNRS, Lab. Lagrange (France)
John D. Monnier, Univ. of Michigan (United States)
Barnaby Norris, The Univ. of Sydney (Australia)
Macquarie Univ. (Australia)
Peter Tuthill, The Univ. of Sydney (Australia)
Julien Woillez, European Southern Observatory (Germany)


Published in SPIE Proceedings Vol. 10701:
Optical and Infrared Interferometry and Imaging VI
Michelle J. Creech-Eakman; Peter G. Tuthill; Antoine Mérand, Editor(s)

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