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12 September 2012 LINC-NIRVANA: assembly, integration, and verification update
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We present an update on the LINC-NIRVANA (LN) instrument, an innovative Fizeau-mode beam combiner for the Large Binocular Telescope (LBT). LN will deliver 10 mas spatial resolution in the near infrared over a 10 arcsec field of view. In addition to optical-path-difference control, the instrument must correct a wide field of view on the sky using multi-conjugated adaptive optics. This substantially increases sky coverage for fringe tracking reference stars. Subsystem delivery and testing is almost complete, and final Assembly, Integration, and Verification are well advanced. We report on closed-loop control of a number of subsystems, including fine-tuning and optimization of the delay line. Measurement and remediation of instrument flexure are key to the success of LN. Several laboratory performance experiments demonstrate that components are within specification. With several interacting subsystems, LN faces a complexity challenge. A Pathfinder experiment at LBT will verify multiple aspects of LINC-NIRVANA and the telescope starting in winter 2012-2013. Finally, we report on efforts to prepare for early science exploitation in "LINC" mode, which uses single-conjugate adaptive optics.
© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
T. M. Herbst, R. Ragazzoni, A. Eckart, and G. Weigelt "LINC-NIRVANA: assembly, integration, and verification update", Proc. SPIE 8445, Optical and Infrared Interferometry III, 84450V (12 September 2012);


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