The principles and techniques of primary refractive-index gas thermometry (RIGT) are reviewed. Absolute primary RIGT using microwave measurements of helium-filled quasi- spherical resonators has been implemented at the temperatures of the triple points of neon, oxygen, argon and water, with relative standard uncertainties ranging from 9.1 × 10 −6 to 3.5 × 10 −5 . Researchers are now also using argon-filled cylindrical microwave resonators for RIGT near ambient temperature, with relative standard uncertainties between 3.8 × 10 −5 and 4.6 × 10 −5 , and conducting relative RIGT measurements on isobars at low temperatures. RIGT at optical frequencies is progressing, and has been used to perform a Boltzmann constant measurement at room temperature with a relative standard uncertainty of 1.2 × 10 −5 . Uncertainty budgets from implementations of absolute primary microwave RIGT, relative primary microwave RIGT and absolute primary optical RIGT are provided.

Refractive-index gas thermometry / Rourke, Patrick M C; Gaiser, Christof; Gao, Bo; Ripa, Daniele Madonna; Moldover, Michael R; Pitre, Laurent; Underwood, Robin J. - In: METROLOGIA. - ISSN 0026-1394. - 56:3(2019), p. 032001. [10.1088/1681-7575/ab0dbe]

Refractive-index gas thermometry

Ripa, Daniele Madonna;
2019

Abstract

The principles and techniques of primary refractive-index gas thermometry (RIGT) are reviewed. Absolute primary RIGT using microwave measurements of helium-filled quasi- spherical resonators has been implemented at the temperatures of the triple points of neon, oxygen, argon and water, with relative standard uncertainties ranging from 9.1 × 10 −6 to 3.5 × 10 −5 . Researchers are now also using argon-filled cylindrical microwave resonators for RIGT near ambient temperature, with relative standard uncertainties between 3.8 × 10 −5 and 4.6 × 10 −5 , and conducting relative RIGT measurements on isobars at low temperatures. RIGT at optical frequencies is progressing, and has been used to perform a Boltzmann constant measurement at room temperature with a relative standard uncertainty of 1.2 × 10 −5 . Uncertainty budgets from implementations of absolute primary microwave RIGT, relative primary microwave RIGT and absolute primary optical RIGT are provided.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11696/61730
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