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Measuring Inhomogeneities In Thermocouple WiresSpools rotated to pull thermocouple wires through liquid nitrogen, while output voltage of thermocouple recorded on strip chart. Wires exposed to severe temperature gradients, amounting to overall change of 200 degrees C, where they enter and leave liquid nitrogen. If wires homogeneous, net output voltage zero. If inhomogeneity passes through liquid-nitrogen/air interface, resulting deviation of output voltage from zero seen immediately on strip chart. If inhomogeneity greater than allowable, reels stopped temporarily so inhomogeneity tagged before wound onto takeup reel.
Document ID
19930000459
Acquisition Source
Legacy CDMS
Document Type
Other - NASA Tech Brief
Authors
Burkett, Cecil G., Jr. (Wyle Labs., Inc.)
West, James W. (Wyle Labs., Inc.)
Crum, James R. (Wyle Labs., Inc.)
Date Acquired
August 16, 2013
Publication Date
August 1, 1993
Publication Information
Publication: NASA Tech Briefs
Volume: 17
Issue: 8
ISSN: 0145-319X
Subject Category
Physical Sciences
Report/Patent Number
LAR-14669
Accession Number
93B10459
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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