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Practical acoustic thermometry with acoustic waveguides.

Sutton, G; de Podesta, M; Veltcheva, R I; Gélat, P N; Minh, H D; Edwards, G (2013) Practical acoustic thermometry with acoustic waveguides. AIP Conf. Proc., 1552. pp. 943-948.

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Acoustic thermometry is the most accurate technique of primary thermometry ever devised. However, resonator based techniques are not practical and are rarely used in practice. Previously we have demonstrated the basic functionality of an acoustic thermometer operating at up to 1000 °C based on the time-of-flight measurements of short pulses in an acoustic waveguide. Here we report progress in assessing the practical and theoretical performance limitations of such a device. In this paper we report improvements in timing techniques which significantly improve the signal-to-noise ratio, a feature likely to be important in many industrial settings. We discuss the inference of the free field speed of sound from timing measurements and report results from a simple twin tube thermometer operating up to 500 °C. Finally we consider the shortcomings of current designs and prospects for future improvements including frequency domain analysis of the system.

Item Type: Article
Subjects: Engineering Measurements
Engineering Measurements > Thermal
Identification number/DOI: 10.1063/1.4821413
Last Modified: 02 Feb 2018 13:14
URI: http://eprintspublications.npl.co.uk/id/eprint/5956

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