Measurement of pressure on a surface using bubble acoustic resonances

The frequency response of gas bubbles as a function of liquid ambient pressure was measured and compared with theory. A bubble size with equivalent spherical radius of 2.29 mm was used over a frequency range of 1000--1500 Hz. The ultimate aim is to develop an acoustic sensor that can measure static...

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Bibliographic Details
Published in:Measurement science & technology 2010-02, Vol.21 (2), p.027002-027002
Main Authors: Aldham, Ben, Manasseh, Richard, Illesinghe, Suhith, Liffman, Kurt, Ooi, Andrew, Šutalo, Ilija D
Format: Article
Language:English
Subjects:
Acoustic measurement
Acoustics
Bubbles
Equivalence
Liquids
Pressure
Static pressure
Tanks
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Summary:The frequency response of gas bubbles as a function of liquid ambient pressure was measured and compared with theory. A bubble size with equivalent spherical radius of 2.29 mm was used over a frequency range of 1000--1500 Hz. The ultimate aim is to develop an acoustic sensor that can measure static pressure and is sensitive to variations as small as a few kPa. The classical bubble resonance frequency is known to vary with ambient pressure. Experiments were conducted with a driven bubble in a pressurizable tank with a signal processing system designed to extract the resonant peak. Since the background response of the containing tank is significant, particularly near tank-modal resonances, it must be carefully removed from the bubble response signal. A dual-hydrophone method was developed to allow rapid and reliable real-time measurements. The expected pressure dependence was found. In order to obtain a reasonable match with theory, the classical theory was modified by the introduction of a 'mirror bubble' to account for the influence of a nearby surface.
ISSN:0957-0233
1361-6501
DOI:10.1088/0957-0233/21/2/027002