Investigation of low-temperature fixed points by an international star intercomparison of sealed triple-point cells

From National Research Council Canada

DOI	Resolve DOI: https://doi.org/10.1088/0026-1394/49/3/257
Author	Search for: Fellmuth, B.; Search for: Wolber, L.; Search for: Head, D. I.; Search for: Hermier, Y.; Search for: Hill, K. D.¹; Search for: Nakano, T.; Search for: Pavese, F.; Search for: Peruzzi, A.; Search for: Rusby, R. L.; Search for: Shkraba, V.; Search for: Steele, A. G.¹; Search for: Steur, P. P. M.; Search for: Szmyrka-Grzebyk, A.; Search for: Tew, W. L.; Search for: Wang, L.; Search for: White, D. R.
Affiliation	National Research Council of Canada. NRC Institute for National Measurement Standards
Format	Text, Article
Subject	Experimental equipments; Filling technologies; Fixed points; Gas sources; Intercomparisons; International Temperature Scale of 1990; Low temperatures; Measurement programs; Melting curves; Thermal behaviours; Triple points; Argon; Hydrogen; Neon; Stars; Temperature; Source separation
Abstract	An overview of the results of an international star intercomparison of low-temperature fixed points is given. Between 1997 and 2005, 68 sealed triple-point cells (STPCs) of the twelve laboratories represented by the authors were investigated at PTB. The STPCs are used to realize the triple points of hydrogen, neon, oxygen and argon as defining fixed points of the International Temperature Scale of 1990, ITS-90. The melting curves (MCs) of all STPCs have been measured on the same experimental equipment, adhering strictly to a single measurement program. This protocol enables separation of the effects influencing the MCs and direct comparison of the thermal behaviour of the STPCs, which are quite different with respect to design, age, gas source and filling technology. In the paper, special emphasis is given to the spread of the liquidus-point temperatures and to the uncertainty of their determination. Connections between the star intercomparison and completed and ongoing international activities are also discussed. © 2012 BIPM & IOP Publishing Ltd.
Publication date	2012-03-12
In	Metrologia 49, no. 3 (12 March 2012): 257–265.
Language	English
Peer reviewed	Yes
NPARC number	21270141
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Record identifier	aaa4fb58-69a9-4536-8e32-622513b075db
Record created	2014-01-06
Record modified	2020-04-21

Date modified:: 2024-07-01