24 July 2014 The GRAVITY/VLTI acquisition camera software
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Abstract
The acquisition camera for the GRAVITY/VLTI instrument implements four functions: a) field imager: science field imaging, tip-tilt; b) pupil tracker: telescope pupil lateral and longitudinal positions; c) pupil imager: telescope pupil imaging and d) aberration sensor: The VLTI beam higher order aberrations measurement. We present the dedicated algorithms that simulate the GRAVITY acquisition camera detector measurements considering the realistic imaging conditions, complemented by the pipeline used to extract the data. The data reduction procedure was tested with real aberrations at the VLTI lab and reconstructed back accurately. The acquisition camera software undertakes the measurements simultaneously for all four AT/UTs in 1 s. The measured parameters are updated in the instrument online database. The data reduction software uses the ESO Common Library for Image Processing (CLIP), integrated in to the ESO VLT software environment.
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Narsireddy Anugu, Paulo J. V. Garcia, Ekkehard Wieprecht, Antonio Amorim, Leonard Burtscher, Thomas Ott, Paulo Gordo, Frank Eisenhauer, Guy Perrin, Wolfgang Brandner, Christian Straubmeier, Karine Perraut, "The GRAVITY/VLTI acquisition camera software", Proc. SPIE 9146, Optical and Infrared Interferometry IV, 91462C (24 July 2014); doi: 10.1117/12.2055831; https://doi.org/10.1117/12.2055831
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