Electromagnetic 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.
Cryogenic Shutter Mechanism
NASA Tech Briefs ; 13 , 10
1989-10-01
Sonstige
Keine Angabe
Englisch
NTRS | 1987
|A Low Power Cryogenic Shutter Mechanism for Use in Infrared Imagers
British Library Conference Proceedings | 2000
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