TEION KOGAKU (Journal of Cryogenics and Superconductivity Society of Japan)
Online ISSN : 1880-0408
Print ISSN : 0389-2441
ISSN-L : 0389-2441
Realization of Helium-4 Vapor Pressure Temperature Scale by Using an Absolute Pressure Transducer
Osamu TAMURANahoko MORII
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2001 Volume 36 Issue 7 Pages 419-426

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Abstract
Helium-4 vapor pressure temperature scale between 2.25K and 4.25K is realized according to the International Temperature Scale of 1990 by using an absolute pressure transducer. The pressure measurement system is much simpler than the conventional precision pressure measurement system using a pressure balance and a differential pressure transducer simultaneously. Standard-type rhodium-iron resistance thermometers are calibrated against the realized scale. The combined standard uncertainty of the calibration is estimated to be less than 0.1mK, including the uncertainty of scale realization, resistance measurement, and the residuals of the third-order polynomial fitting equation.
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© Cryogenic Association of Japan
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