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8 July 2014 Precise angular positioning at 6K: the FIFI-LS grating assembly
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The Field Imaging Far Infrared Line Spectrometer (FIFI-LS) obtains spectral data within two wavelength ranges. The observed wavelengths are set by rotating the two diffraction gratings to specific angles. This paper describes on the grating assemblies, designed to rotate and stabilize the gratings. First the assembly itself and its special environment inside FIFI-LS is explained. Then a method is layed out how to monitor the performance of the drive and how to detect upcoming failures before they happen. The last chapter is dedicated to first inflight measurements of the position stability of the grating.
© (2014) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Felix Rebell, Walfried Raab, Sebastian Colditz, Simon Beckmann, Aaron Bryant, Christian Fischer, Fabio Fumi, Norbert Geis, Rainer Hönle, Randolf Klein, Alfred Krabbe, Leslie Looney, Albrecht Poglitsch, Sarah Ragan, and Maureen Savage "Precise angular positioning at 6K: the FIFI-LS grating assembly", Proc. SPIE 9147, Ground-based and Airborne Instrumentation for Astronomy V, 914735 (8 July 2014);


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