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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



ID: 731973.0, MPI für Astronomie / Publikationen_mpia
GRAVITY acquisition camera: characterization results
Authors:Anugu, N.; Garcia, P.; Amorim, A.; Wiezorrek, E.; Wieprecht, E.; Eisenhauer, F.; Ott, T.; Pfuhl, O.; Gordo, P.; Perrin, G.; Brandner, W.; Straubmeier, C.; Perraut, K.
Place of Publication:Bellingham, Wash.
Publisher:SPIE
Date of Publication (YYYY-MM-DD):2016
Audience:Not Specified
Abstract / Description: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.
External Publication Status:published
Document Type:Other
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:URL:http://adsabs.harvard.edu/abs/2016SPIE.9907E..27A
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