Abstract
The Transfer function method was used to determine the phase speed in a bubbly liquid at the single bubble resonant frequency. The Transfer function technique is widely used to determine the impedance of an absorbing sample. Once the impedance of the sample is found, the phase speed can be determined. White noise was generated and allowed to propagate upward in a vertical, steel, impedance tube. The top was terminated by a bubble cloud generated by pressurized air forced through hypodermic needles. The sound spectrum was measured at two different points in the pure water by carefully moving a single hydrophone. The transfer function was then determined and used to calculate the phase speed in the bubbly liquid.
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