12 September 2012 LINC-NIRVANA: optical elements of the fringe and flexure tracker
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Abstract
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 baffie. We give an overview of the current design and implementation stage of the FFTS opto-mechanical components. The optical components represent an update of the original design to assess slow image motion induced by the LN instrument separately.
© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Jens Zuther, Andreas Eckart, Thomas Bertram, Matthew Horrobin, Bettina Lindhorst, Uwe Lindhorst, Jörg-Uwe Pott, Christoph Rauch, Steffen Rost, Semir Smajic, Christian Straubmeier, Imke Wank, Udo Beckmann, Rainer Lenzen, and Evangelia Tremou "LINC-NIRVANA: optical elements of the fringe and flexure tracker", Proc. SPIE 8445, Optical and Infrared Interferometry III, 844536 (12 September 2012); doi: 10.1117/12.926017; https://doi.org/10.1117/12.926017
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