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Cryogenic Shutter MechanismElectromagnetic shutter mechanism operates at ambient and cryogenic temperatures to shield optical element, such as mirror, filter, polarizer, beam splitter, or detector, from external light and radiation in cryogenic Dewar equipped with window for optical evaluation. Shutter mechanism in Dewar container alternately shields and exposes optical element as paddle rotates between mechanical stops. Mounted on cold plate of liquid-helium reservoir. Paddle, shaft, and magnet constitutes assembly rotated by electromagnetic field on coil.
Document ID
19890000503
Acquisition Source
Legacy CDMS
Document Type
Other - NASA Tech Brief
Authors
Barney, Richard D. (NASA Goddard Space Flight Center, Greenbelt, MD.)
Magner, Thomas J. (NASA Goddard Space Flight Center, Greenbelt, MD.)
Date Acquired
August 14, 2013
Publication Date
October 1, 1989
Publication Information
Publication: NASA Tech Briefs
Volume: 13
Issue: 10
ISSN: 0145-319X
Subject Category
Physical Sciences
Report/Patent Number
GSC-13189
Accession Number
89B10503
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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