Acoustic thermometer with a single waveguide

Rok Tavčar, Dušan Agrež, Samo Beguš

Abstract

This paper presents implementation and testing of the acoustical thermometer with a single waveguide. Proposed design has a few specific advantages against other types of acoustic designs with waveguides, such as smaller size, better sensitivity and the same common sound path. The paper describes each advantage and tests used to determine their usefulness. Finally it shows how to deal with disadvantages of this design, such as weak return signals and possible coincidences of the return signals. The instrument was calibrated at ice point and then tested in oil bath from -30 °C to 120 °C. In steady states it has standard deviation of 0.050 °C with 66 independent readings per second. Stability of the bath is 10 mK and uncertainty of the reference thermometer is 0.003 °C.

Keywords

sound, temperature, acoustic, PAT

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IMEKO-TC4-2017-047.pdf

DOI

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IMEKO TC

TC4 - Measurement of Electrical Quantities

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