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Development of Cryogenic Filter Wheels for the HERSCHEL Photodetector Array Camera & Spectrometer (PACS)This paper describes the two PACS Filter Wheels that are direct-drive rotational mechanisms operated at a temperature below 5K inside the PACS focal plane unit of the Herschel Satellite. The purpose of the mechanisms is to switch between filters. The rotation axis is pivoted to the support structure via a slightly preloaded pair of ball bearings and driven by a Cryotorquer. Position sensing is realized by a pair of Hall effect sensors. Powerless positioning at the filter positions is achieved by a magnetic ratchet system. The key technologies are the Cryotorquer design and the magnetic ratchet design in the low temperature range. Furthermore, we will report on lessons learned during the development and qualification of the mechanism and the paint.
Document ID
20150004045
Acquisition Source
Goddard Space Flight Center
Document Type
Conference Paper
Authors
Koerner, Christian
(Kayser Threde G.m.b.H. Munich, Germany)
Kampf, Dirk
(Kayser Threde G.m.b.H. Munich, Germany)
Poglitsch, Albrecht
(Max-Planck-Inst. fuer Extraterrestrische Physik Garching, Germany)
Schubert, Josef
(Max-Planck-Inst. fuer Extraterrestrische Physik Garching, Germany)
Ruppert, U.
(Freie Univ. Berlin, Germany)
Schoele, M.
(Freie Univ. Berlin, Germany)
Date Acquired
April 2, 2015
Publication Date
May 1, 2014
Publication Information
Publication: The 42nd Aerospace Mechanism Symposium
Subject Category
Mechanical Engineering
Meeting Information
Meeting: Aerospace Mechanisms Symposium
Location: Greeenbelt, MD
Country: United States
Start Date: May 14, 2014
End Date: May 16, 2014
Sponsors: NASA Goddard Space Flight Center
Distribution Limits
Public
Copyright
Public Use Permitted.
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