Abstract
Acoustic phase velocity measurements of a bubble swarm in a cylindrical tube have been made with a fiber optic sensor. The fundamental design of this system is similar to one used in a previous experiment [S. A. Cheyne et al., ‘‘Phase velocity measurements in bubbly liquids using a fiber optic laser interferometer,’’ J. Acoust. Soc. Am. 97, 1621 (1995)]. This new system is more robust and is more easily constructed than the previous system. Results will be presented that will show conclusively that data have been obtained just after the bubble resonance in the regime where the attenuation of sound is very high. Other results will be presented at different air-to-water ratios (void fraction).
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