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Acoustic gas thermometry.

Moldover, M R*; Gavioso, R M*; Mehl, J B*; Pitre, L*; de Podesta, M; Zhang, J T* (2014) Acoustic gas thermometry. Metrologia, 51 (1). R1-R19

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We review the principles, techniques and results from primary acoustic gas thermometry (AGT). Since the establishment of ITS-90, the International Temperature Scale of 1990, spherical and quasi-spherical cavity resonators have been used to realize primary AGT in the temperature range 7K to 552 K. Throughout the sub-range 90K < T < 384 K, at least two laboratories measured (T - T90). (Here T is the thermodynamic temperature and T90 is the temperature on ITS-90.) With a minor exception, the resulting values of (T - T90) are mutually consistent within 3 × 10-6 T. These consistent measurements were obtained using helium and argon as thermometric gases inside cavities that had radii ranging from 40mm to 90mm and that had walls made of copper or aluminum or stainless-steel. The AGT values of (T - T90) fall on a smooth curve that is outside ±u(T90), the estimated uncertainty of T90. Thus, the AGT results imply that ITS-90 has errors that could be reduced in a future temperature scale. Recently developed techniques imply that low-uncertainty AGT can be realized at temperatures up to 1350K or higher and also at temperatures in the liquid-helium range.

Item Type: Article
Keywords: Acoustic, gas thermometry
Subjects: Engineering Measurements
Engineering Measurements > Thermal
Identification number/DOI: 10.1088/0026-1394/51/1/R1
Last Modified: 02 Feb 2018 13:14
URI: http://eprintspublications.npl.co.uk/id/eprint/6075

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