Sutton, G J M (2009) Determination of the boltzmann constant: acoustic models and corrections for argon and helium. NPL Report. ENG 19

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Abstract

This document contains the relationships and Labview code used to calculate the thermo-viscous corrections to the resonance frequencies to terms in P2 for argon, and to terms in P for helium. It also includes:
The shell-coupling model of Mehl [1] for radial modes.
The improved shell-coupling model of Pitre [13].
The duct correction of Mehl [14].
The transducer correction.
The 2nd order shape correction for a tri-axial ellipsoid.
Correction to the triple point of water temperature.
Calculation of the speed of sound.
Least squares fitting procedures.
The location of the working Software suite and the back-up files is given in the Appendix.

Item Type:	Report/Guide (NPL Report)
NPL Report No.:	ENG 19
Keywords:	temperature, boltzmann, constant, ITS90, acoustic, corrections, resonator
Subjects:	Engineering Measurements Engineering Measurements > Thermal
Last Modified:	02 Feb 2018 13:15
URI:	https://eprintspublications.npl.co.uk/id/eprint/4534