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Fringe Tracker for the VLTI Spectro-Imager

Published online by Cambridge University Press:  01 October 2007

M. Gai ,
D. F. Buscher ,
L. Corcione ,
S. Ligori  and
J. S. Young
M. Gai
Affiliation:
Istituto Nazionale di Astrofisica – Osservatorio Astronomico di Torino, Italy email: gai@oato.inaf.it
D. F. Buscher
Affiliation:
Astrophysics Group, Cavendish Laboratory, University of Cambridge, UK email: dfb@mrao.cam.ac.uk
L. Corcione
Affiliation:
Istituto Nazionale di Astrofisica – Osservatorio Astronomico di Torino, Italy email: gai@oato.inaf.it
S. Ligori
Affiliation:
Istituto Nazionale di Astrofisica – Osservatorio Astronomico di Torino, Italy email: gai@oato.inaf.it
J. S. Young
Affiliation:
Astrophysics Group, Cavendish Laboratory, University of Cambridge, UK email: dfb@mrao.cam.ac.uk
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Abstract

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Interferometry in the near IR aims at providing imaging resolution on the mas scale, and astrometry at the few μas level, from ground based infrastructures using current telescope technology. To take advantage of simultaneous combination of four to eight telescopes, an international consortium is proposing to ESO the development of the VLTI Spectro-Imager. One of the key sub-systems, to measure and correct the atmospheric perturbations relative to the beam phase, is the fringe tracker, aimed at providing the science combiner with long, stable observing conditions. The fringe tracker function in interferometer is equivalent to adaptive optics for conventional telescopes. The fringe tracker concept under study, using minimum redundancy combination and bulk optics, is described.

Keywords

instrumentation: interferometerstechniques: interferometric
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S248: A Giant Step: from Milli- to Micro-arcsecond Astrometry , October 2007 , pp. 106 - 107
Copyright
Copyright © International Astronomical Union 2008

References

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Basden, A. G. & Buscher, D. F. 2005, MNRAS 357, 656Google Scholar
Gai, M. et al. 2004, Proc. SPIE 5491, 528Google Scholar
Ribak, E. N., Gai, M, Loreggia, D., & Lipson, S. G. 2007, Optics Letters 32, 1075CrossRefGoogle Scholar