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12 September 2012 The final design of the GRAVITY acquisition camera and associated VLTI beam monitoring strategy
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Abstract
The GRAVITY acquisition camera measurements are part of the overall beam stabilization by measuring each second the tip-tilt and the telescope pupil lateral and longitudinal positions, while monitoring at longer intervals the full telescope pupil, and the VLTI beam higher order aberrations. The infrared acquisition camera implements a mosaic of field, pupil, and Shack Hartman type images for each telescope. Star light is used to correct the tip-tilt while laser beacons placed at the telescope spiders are used to measure the pupil lateral positions. Dedicated optimized algorithms are applied to each image, extracting the beam parameters and storing them on the instrument database. The final design is built into the GRAVITY beam combiner, around a structural plane where the 4 telescope folding optics and field imaging lenses are attached. A fused silica prism assembly, kept around detector temperature, is placed near to the detector implementing the different image modes.
© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Antonio Amorim, Jorge Lima, Narsireddy Anugu, Frank Eisenhauer, Alexander Graeter, Marcus Haug, Thomas Ott, Oliver Pfuhl, Markus Thiel, Ekkehard Wieprecht, Pedro Carvas, Paulo Garcia, Guy Perrin, Wolfgang Brandner, Christian Straubmeier, and Karine Perraut "The final design of the GRAVITY acquisition camera and associated VLTI beam monitoring strategy", Proc. SPIE 8445, Optical and Infrared Interferometry III, 844534 (12 September 2012); https://doi.org/10.1117/12.925993
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