Measurement of pressure on a surface using bubble acoustic resonances
Ben Aldham, Richard Manasseh, Suhith Illesinghe, Kurt Liffman, Andrew Ooi, Ilija D Sutalo
MEASUREMENT SCIENCE AND TECHNOLOGY | IOP PUBLISHING LTD | Published : 2010
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 m..View full abstract
Awarded by NHMRC
This work was supported by NHMRC grant 303267. We are grateful to Tony Swallow for electronics support and to Dr Michael Lawrence-Brown and Professor James Semmens of Curtin University for the medical inspiration of this work. We are also grateful to advice from an anonymous reviewer.