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20 July 2010 Cryogenic magnetic bearing scanning mechanism design for the SPICA/SAFARI Fourier transform spectrometer
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TNO, together with its partners Micromega and SRON, have designed a cryogenic scanning mechanism for use in the SAFARI Fourier Transform Spectrometer (FTS) on board of the SPICA mission. The optics of the FTS scanning mechanism (FTSM) consists of two back-to-back cat's-eyes. The optics are mounted on a central "back-bone" tube which houses all the important mechatronic parts: the magnetic bearing linear guiding system, a magnetic linear motor serving as the OPD actuator, internal metrology with nanometer resolution, and a launch lock. A magnetic bearing is employed to enable a large scanning stroke in a small volume. It supports the optics in a free-floating way with no friction, or other non-linearities, enabling sub-nanometer accuracy within a single stage with a stroke of -4 mm to +31.5 mm. Because the FTSM will be used at cryogenic temperatures of 4 Kelvin, the main structure and optics are all constructed from 6061 Aluminum. The overall outside dimensions of the FTSM are: 393 x 130 x 125 mm, and the mass is 2.2 kg.
© (2010) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Teun C. van den Dool, Roger F. M. M. Hamelinck, Bob Kruizinga, Wim L. M. Gielesen, Ben C. Braam, Jan R. Nijenhuis, Nicolas Loix, Stanislas Luyckx, Dennis van Loon, Peter Paul Kooijman, and Bruce M. Swinyard "Cryogenic magnetic bearing scanning mechanism design for the SPICA/SAFARI Fourier transform spectrometer", Proc. SPIE 7739, Modern Technologies in Space- and Ground-based Telescopes and Instrumentation, 77391B (20 July 2010);

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