21 July 2010 The LINC-NIRVANA fringe and flexure tracker: an update of the opto-mechanical system
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LINC-NIRVANA (LN) is a German/Italian interferometric beam combiner camera for the Large Binocular Telescope. Due to homothetic imaging, LN will make use of an exceptionally large field-of-view. As part of LN, the Fringe-and-Flexure-Tracker system (FFTS) will provide real-time, closed-loop measurement and correction of pistonic and flexure signals induced by the atmosphere and inside the telescope-instrument system. Such compensation is essential for achieving coherent light combination over substantial time intervals (~ 10min.). The FFTS is composed of a dedicated near-infrared detector, which can be positioned by three linear stages within the curved focal plane of LN. The system is divided into a cryogenic (detector) and ambient (linear stages) temperature environment, which are isolated from each other by a moving baffle. We give an overview of the current design and implementation stage of the FFTS opto-mechanical and electronic components. We present recent important updates of the system, including the development of separated channels for the tracking of piston and flexure. Furthermore, the inclusion of dispersive elements will allow for the correction of atmospheric differential refraction, as well as the induction of artificial dispersion to better exploit the observational-conditions parameter space (air mass, brightness).
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Jens Zuther, Andreas Eckart, Thomas Bertram, Matthew Horrobin, Bettina Lindhorst, Uwe Lindhorst, Lydia Moser, Steffen Rost, Christian Straubmeier, Evangelia Tremou, and Imke Wank "The LINC-NIRVANA fringe and flexure tracker: an update of the opto-mechanical system", Proc. SPIE 7734, Optical and Infrared Interferometry II, 773448 (21 July 2010); doi: 10.1117/12.856861; https://doi.org/10.1117/12.856861


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