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Twin-tube Practical acoustic thermometry: theory and measurements up to 1000 °C.

Sutton, G; Edwards, G J; Veltcheva, R I; de Podesta, M (2015) Twin-tube Practical acoustic thermometry: theory and measurements up to 1000 °C. Supercond. Sci. Technol., 28 (8). 085901

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Abstract

We present details of a Practical Acoustic Thermometer (PAT), in which temperature is inferred from measurements of the speed of sound along an acoustic waveguide. We describe both the theory of operation, and measurements on two devices up to 1000 °C. Sound propagation in narrow tubes can be completely defined in terms of a complex, frequency-dependent propagation constant describing the evolution of the amplitude and phase of a wave. Because the relationship between the speed of sound in a simple gas and absolute temperature is well understood, the mean temperature along a tube may be estimated from measurements of the propagation constant. A twin tube PAT device allows the temperature measurement region to be localised, making for a device similar to traditional thermometers. Two prototype PAT devices are described. The first, made of silica, serves to validate the technique with differences between the acoustic thermometer and a reference thermocouple of less than 2 °C at temperatures in the range from 100 °C to 1000 °C. The second, made of Inconel-600, is more suitable for use in harsh environments and drift observed during prolonged exposure to high temperatures is described. In the longer term, similar technology may provide a potential solution to the measurement of temperature in harsh environments such as those found in the nuclear industry.

Item Type: Article
Keywords: temperature, acoustic, speed of sound, practical, thermometer, nuclear reactor, PAT dispersion
Subjects: Engineering Measurements
Engineering Measurements > Thermal
Identification number/DOI: 10.1088/0957-0233/26/8/085901
Last Modified: 02 Feb 2018 13:13
URI: http://eprintspublications.npl.co.uk/id/eprint/6726

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