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Proceedings Paper

Results from the VLTI-PRIMA fringe tracking testbed
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Paper Abstract

The Fringe Sensor Unit (FSU) is the central element of the dual-feed facility PRIMA at the VLT Interferometer (VLTI). Two identical FSU fringe detectors deliver real-time estimates of phase delay, group delay and signal-to-noise ratio for the two observed targets. They serve both as the scientific instrument for astrometry with PRIMA and as sensor for the fringe tracking system of the interferometer. Prior to its installation at the VLTI scheduled for mid-2008, the FSU is going through an extensive laboratory test phase. It is therefore embedded in a semi-realistic environment, involving a VLTI-like control system and a laser metrology. This allows us to probe the system response to atmospheric piston jitter, tip-tilt disturbances and higher order aberrations, as they are expected at the observatory. We report on the system test results, outline the optimisation of the calibration procedure and we evaluate the FSU fringe tracking performance under realistic conditions. Finally, we compare the obtained performances to the scientific and technical requirements.

Paper Details

Date Published: 28 July 2008
PDF: 12 pages
Proc. SPIE 7013, Optical and Infrared Interferometry, 70131A (28 July 2008); doi: 10.1117/12.786612
Show Author Affiliations
Johannes Sahlmann, European Southern Observatory (Germany)
Observatoire de Genève (Switzerland)
Roberto Abuter, European Southern Observatory (Germany)
Nicola Di Lieto, European Southern Observatory (Germany)
Serge Ménardi, European Southern Observatory (Germany)
Françoise Delplancke, European Southern Observatory (Germany)
Hendrik Bartko, Max-Planck-Institut für Extraterrestrische Physik (Germany)
Frank Eisenhauer, Max-Planck-Institut für Extraterrestrische Physik (Germany)
Samuel Lévêque, European Southern Observatory (Germany)
Oliver Pfuhl, Max-Planck-Institut für Extraterrestrische Physik (Germany)
Nicolas Schuhler, European Southern Observatory (Germany)
Gerard van Belle, European Southern Observatory (Germany)
Gautam Vasisht, European Southern Observatory (Germany)
Jet Propulsion Lab. (United States)

Published in SPIE Proceedings Vol. 7013:
Optical and Infrared Interferometry
Markus Schöller; William C. Danchi; Françoise Delplancke, Editor(s)

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