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Silicon Detectors For Helium Liquid And VaporSimple electrical-resistance devices made of silicon indicate whether helium liquid or helium vapor present. Devices designed primarily for use in outer space, were tested and found to operate in normal Earth gravity. Silicon cubes supported by stainless-steel wires and strips. Voltage across each cube at fixed current indicates whether immersed in helium liquid or vapor. Liquid cools more than vapor does, resulting in greater electrical resistance. Such helium-liquid/vapor detectors incorporated into ducts or containers of laboratory equipment, and used to infer locations of liquid/vapor interfaces in order to measure quantities of liquid and vapor or to control refill operations.
Document ID
19900000401
Acquisition Source
Legacy CDMS
Document Type
Other - NASA Tech Brief
Authors
Di Pirro, M. J.
(NASA Goddard Space Flight Center, Greenbelt, MD.)
Serlemitsos, A. T.
(NASA Goddard Space Flight Center, Greenbelt, MD.)
Date Acquired
August 14, 2013
Publication Date
August 1, 1990
Publication Information
Publication: NASA Tech Briefs
Volume: 14
Issue: 8
ISSN: 0145-319X
Subject Category
Physical Sciences
Report/Patent Number
GSC-13281
Accession Number
90B10401
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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