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Microwave dimensional measurements of cylindrical resonators for primary acoustic thermometry.

Underwood, R J; Edwards, G J (2014) Microwave dimensional measurements of cylindrical resonators for primary acoustic thermometry. Int. J. Thermophysics, 35 (6-7). pp. 971-984.

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Abstract

Primary acoustic thermometry relies on the fundamental relationship between the speed of sound in a monatomic gas and its thermodynamic temperature. The speed of sound is calculated from the resonance frequencies of a cavity whose dimensions and thermal expansivity must be measured with high accuracy. For quasi-spherical cavities, the use of microwave resonances is a successful and proven dimensional measurement technique. In this article we consider how the technique might be applied to cylindrical cavities. We provide some basic theory with special emphasis on mode selection and perturbations arising from geometrical imperfections. Practical considerations such as the design and placement of coupling antennae and the resolution of individual modes are addressed. Finally, we present experimental results obtained with a prototype resonator, and discuss the implications of our work for future measurements of thermodynamic temperature.

Item Type: Article
Subjects: Engineering Measurements
Engineering Measurements > Thermal
Identification number/DOI: 10.1007/s10765-014-1726-x
Last Modified: 02 Feb 2018 13:14
URI: http://eprintspublications.npl.co.uk/id/eprint/6383

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