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Proceedings Paper

GRAVITY acquisition camera: characterization results
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Paper Abstract

GRAVITY acquisition camera implements four optical functions to track multiple beams of Very Large Telescope Interferometer (VLTI): a) pupil tracker: a 2×2 lenslet images four pupil reference lasers mounted on the spiders of telescope secondary mirror; b) field tracker: images science object; c) pupil imager: reimages telescope pupil; d) aberration tracker: images a Shack-Hartmann. The estimation of beam stabilization parameters from the acquisition camera detector image is carried out, for every 0.7 s, with a dedicated data reduction software. The measured parameters are used in: a) alignment of GRAVITY with the VLTI; b) active pupil and field stabilization; c) defocus correction and engineering purposes. The instrument is now successfully operational on-sky in closed loop. The relevant data reduction and on-sky characterization results are reported.

Paper Details

Date Published: 4 August 2016
PDF: 8 pages
Proc. SPIE 9907, Optical and Infrared Interferometry and Imaging V, 990727 (4 August 2016); doi: 10.1117/12.2233315
Show Author Affiliations
Narsireddy Anugu, Univ. do Porto (Portugal)
CENTRA (Portugal)
Paulo Garcia, Univ. do Porto (Portugal)
CENTRA (Portugal)
Antonio Amorim, CENTRA-SIM (Portugal)
FCUL (Portugal)
Erich Wiezorrek, 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)
Thomas Ott, Max Planck Institute for extraterrestrial Physics (Germany)
Oliver Pfuhl, Max Planck Institute for extraterrestrial Physics (Germany)
Paulo Gordo, CENTRA-SIM (Portugal)
FCUL (Portugal)
Guy Perrin, Observatoire de Paris Meudon (France)
Wolfgang Brandner, Max-Planck-Institut für Astronomie (Germany)
Christian Straubmeier, Univ. zu Köln (Germany)
Karine Perraut, Institut de Planétologie et d’Astrophysique de Grenoble (France)


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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