The PRIMA fringe sensor unit
@article{Sahlmann2009ThePF, title={The PRIMA fringe sensor unit}, author={Johannes Sahlmann and S{\'e}rge M{\'e}nardi and Roberto Abuter and Matteo Accardo and Sergio Mottini and Francoise Delplancke Eso and Observatoire de Geneve and Thales Alenia Space}, journal={Astronomy and Astrophysics}, year={2009}, volume={507}, pages={1739-1757} }
Context. The fringe sensor unit (FSU) is the central element of the phase referenced imaging and micro-arcsecond astrometry (PRIMA) dual-feed facility and provides fringe sensing for all observation modes, comprising off-axis fringe tracking, phase referenced imaging, and high-accuracy narrow-angle astrometry. It is installed at the Very Large Telescope Interferometer (VLTI) and successfully served the fringe-tracking loop during the initial commissioning phase. Aims. To maximise sensitivity…
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