Image-plane fringe tracker for adaptive-optics assisted long baseline interferometry

Michael J. Ireland, Denis Defrère, Frantz Martinache, John D. Monnier, Barnaby Norris, Peter Tuthill, Julien Woillez

Research output: Chapter in Book/Report/Conference proceedingConference proceeding contributionpeer-review

3 Citations (Scopus)


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.

Original languageEnglish
Title of host publicationOptical and Infrared Interferometry and Imaging VI
EditorsMichelle J. Creech-Eakman, Peter G. Tuthill, Antoine Mérand
Place of PublicationBellingham, Washington
Number of pages10
ISBN (Electronic)Bellingham, Washington
ISBN (Print)9781510619555
Publication statusPublished - 9 Jul 2018
Event2018 Optical and Infrared Interferometry and Imaging VI - Austin, United States
Duration: 11 Jun 201815 Jun 2018

Publication series

NameProceedings of SPIE
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


Conference2018 Optical and Infrared Interferometry and Imaging VI
Country/TerritoryUnited States


  • adaptive optics
  • fringe tracking
  • Long baseline optical interferometry


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