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Progress towards the determination of the thermodynamic temperature with ultra-low uncertainty.

Gavioso, R M*; Ripa, D M*; Steur, P P M*; Gaiser, C*; Zandt, T*; Fellmuth, B*; de Podesta, M; Underwood, R; Sutton, G; Pitre, L*; Sparasci, F*; Risegari, L*; Gianfrani, L*; Castrillo, A*; Machin, G (2016) Progress towards the determination of the thermodynamic temperature with ultra-low uncertainty. Philos. Trans. R. Soc. Lond. A, Math. Phys. Eng. Sci., 374 (2064). 20150046

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Previous research effort towards the determination of the Boltzmann constant has significantly improved the supporting theory and the experimental practice of several primary thermometry methods based on the measurement of a thermodynamic-related property of a macroscopic system at the temperature of the triple-point of water. Presently, these experiments are underway to demonstrate their accuracy in the determination of the thermodynamic temperature T over an extended range spanning the interval between a few kelvin and the copper freezing point (1358 K).
We discuss how these activities are expected to improve the formal approximation to the thermodynamic temperature currently provided by the International Temperature Scale of 1990 (ITS-90) and report some preliminary results obtained by dielectric constant gas thermometry and acoustic gas thermometry. We also provide information on the status of other primary methods, such as Doppler broadening thermometry, Johnson noise thermometry and refractive index gas thermometry. Finally, we briefly consider the perspectives of these advancements for the dissemination of calibrated temperature standards.

Item Type: Article
Keywords: Thermodynamic Temperature, ITS-90, Acoustic Thermometry
Subjects: Engineering Measurements
Engineering Measurements > Thermal
Identification number/DOI: 10.1098/rsta.2015.0046
Last Modified: 02 Feb 2018 13:13
URI: http://eprintspublications.npl.co.uk/id/eprint/7049

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