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Germanium resistance thermometer calibration at superfluid helium temperaturesThe rapid increase in resistance of high purity semi-conducting germanium with decreasing temperature in the superfluid helium range of temperatures makes this material highly adaptable as a very sensitive thermometer. Also, a germanium thermometer exhibits a highly reproducible resistance versus temperature characteristic curve upon cycling between liquid helium temperatures and room temperature. These two factors combine to make germanium thermometers ideally suited for measuring temperatures in many cryogenic studies at superfluid helium temperatures. One disadvantage, however, is the relatively high cost of calibrated germanium thermometers. In space helium cryogenic systems, many such thermometers are often required, leading to a high cost for calibrated thermometers. The construction of a thermometer calibration cryostat and probe which will allow for calibrating six germanium thermometers at one time, thus effecting substantial savings in the purchase of thermometers is considered.
Document ID
19850013918
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Mason, F. C.
(Middle Tennessee State Univ. Murfreesboro, TN, United States)
Date Acquired
August 12, 2013
Publication Date
January 1, 1985
Publication Information
Publication: Alabama Univ. Res. Rept.: 1984 NASA/ASEE Summer Faculty Fellowship Program (NASA-CR
Subject Category
Instrumentation And Photography
Accession Number
85N22228
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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