4 August 2016 GRAVITY acquisition camera: characterization results
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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.
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Narsireddy Anugu, Narsireddy Anugu, Paulo Garcia, Paulo Garcia, Antonio Amorim, Antonio Amorim, Erich Wiezorrek, Erich Wiezorrek, Ekkehard Wieprecht, Ekkehard Wieprecht, Frank Eisenhauer, Frank Eisenhauer, Thomas Ott, Thomas Ott, Oliver Pfuhl, Oliver Pfuhl, Paulo Gordo, Paulo Gordo, Guy Perrin, Guy Perrin, Wolfgang Brandner, Wolfgang Brandner, Christian Straubmeier, Christian Straubmeier, Karine Perraut, Karine Perraut, } "GRAVITY acquisition camera: characterization results", Proc. SPIE 9907, Optical and Infrared Interferometry and Imaging V, 990727 (4 August 2016); doi: 10.1117/12.2233315; https://doi.org/10.1117/12.2233315
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