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.
@article{arxiv.2012.11670,
title = {GRAVITY acquisition camera: characterization results},
author = {Narsireddy Anugu and Paulo Garcia and Antonio Amorim and Erich Wiezorrek and Ekkehard Wieprecht and Frank Eisenhauer and Thomas Ott and Oliver Pfuhl and Paulo Gordo and Guy Perrin and Wolfgang Brandner and Christian Straubmeierfan and Karine Perraut},
journal= {arXiv preprint arXiv:2012.11670},
year = {2020}
}
Comments
SPIE, Optical and Infrared Interferometry and Imaging V, Proceedings Volume 9907, 990727, 2016, "See, https://doi.org/10.1117/12.2233315"