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Proceedings Paper

The metrology system of the VLTI instrument GRAVITY
Author(s): Magdalena Lippa; Stefan Gillessen; Nicolas Blind; Yitping Kok; Şenol Yazıcı; Johannes Weber; Oliver Pfuhl; Marcus Haug; Stefan Kellner; Ekkehard Wieprecht; Frank Eisenhauer; Reinhard Genzel; Oliver Hans; Frank Haußmann; David Huber; Tobias Kratschmann; Thomas Ott; Markus Plattner; Christian Rau; Eckhard Sturm; Idel Waisberg; Erich Wiezorrek; Guy Perrin; Karine Perraut; Wolfgang Brandner; Christian Straubmeier; Antonio Amorim
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Paper Abstract

The VLTI instrument GRAVITY combines the beams from four telescopes and provides phase-referenced imaging as well as precision-astrometry of order 10 μas by observing two celestial objects in dual-field mode. Their angular separation can be determined from their differential OPD (dOPD) when the internal dOPDs in the interferometer are known. Here, we present the general overview of the novel metrology system which performs these measurements. The metrology consists of a three-beam laser system and a homodyne detection scheme for three-beam interference using phase-shifting interferometry in combination with lock-in amplifiers. Via this approach the metrology system measures dOPDs on a nanometer-level.

Paper Details

Date Published: 4 August 2016
PDF: 9 pages
Proc. SPIE 9907, Optical and Infrared Interferometry and Imaging V, 990722 (4 August 2016); doi: 10.1117/12.2232272
Show Author Affiliations
Magdalena Lippa, Max Planck Institute for Extraterrestrial Physics (Germany)
Stefan Gillessen, Max Planck Institute for Extraterrestrial Physics (Germany)
Nicolas Blind, Univ. de Genève (Switzerland)
Yitping Kok, The Univ. of Western Australia (Australia)
Şenol Yazıcı, Max Planck Institute for Extraterrestrial Physics (Germany)
Johannes Weber, Max Planck Institute for Extraterrestrial Physics (Germany)
Oliver Pfuhl, Max Planck Institute for Extraterrestrial Physics (Germany)
Marcus Haug, Max Planck Institute for Extraterrestrial Physics (Germany)
Stefan Kellner, Max Planck Institute for Extraterrestrial Physics (Germany)
Ekkehard Wieprecht, Max Planck Institute for Extraterrestrial Physics (Germany)
Frank Eisenhauer, Max Planck Institute for Extraterrestrial Physics (Germany)
Reinhard Genzel, Max Planck Institute for Extraterrestrial Physics (Germany)
Oliver Hans, Max Planck Institute for Extraterrestrial Physics (Germany)
Frank Haußmann, Max Planck Institute for Extraterrestrial Physics (Germany)
David Huber, Max Planck Institute for Extraterrestrial Physics (Germany)
Tobias Kratschmann, Max Planck Institute for Extraterrestrial Physics (Germany)
Thomas Ott, Max Planck Institute for Extraterrestrial Physics (Germany)
Markus Plattner, Max Planck Institute for Extraterrestrial Physics (Germany)
Christian Rau, Max Planck Institute for Extraterrestrial Physics (Germany)
Eckhard Sturm, Max Planck Institute for Extraterrestrial Physics (Germany)
Idel Waisberg, Max Planck Institute for Extraterrestrial Physics (Germany)
Erich Wiezorrek, Max Planck Institute for Extraterrestrial Physics (Germany)
Guy Perrin, Observatoire de Paris, LESIA (France)
Karine Perraut, IPAG, Domaine Univ. (France)
Wolfgang Brandner, MPIA Heidelberg (Germany)
Christian Straubmeier, Univ. Cologne (Germany)
Antonio Amorim, SIM FCUL (Portugal)


Published in SPIE Proceedings Vol. 9907:
Optical and Infrared Interferometry and Imaging V
Fabien Malbet; Michelle J. Creech-Eakman; Peter G. Tuthill, Editor(s)

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