### ASA 130th Meeting - St. Louis, MO - 1995 Nov 27 .. Dec 01

## 3aPAa4. Simultaneous bubble sizing using multiple acoustic techniques.

**T. G. Leighton
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*Inst. of Sound & Vib. Res., Univ. of Southampton, Highfield, Southampton
SO17 1BJ, England
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There exists a range of acoustic techniques for characterizing bubble
populations within liquids. Each technique has limitations, and complete
characterization of a population requires the simultaneous use of several, so
that the limitations of each find compensation in the others. An experiment is
described in which a simple controlled bubble population is subjected to a
driving signal at pump frequency, (omega)[inf p], and a second signal at the
imaging frequency, (omega)[inf i]. The population is then simultaneous examined
using geometrical scattering, and resonance scattering of the fundamental
frequency ((omega)[inf p]), second and third harmonics (2(omega)[inf p],
3(omega)[inf p]), and combination frequencies ((omega)[inf i](plus or
minus)(omega)[inf p] and (omega)[inf i](plus or minus)(omega)[inf p]/2).
Comparison is made of the ease, accuracy, and speed with which individual
techniques measure the population, and what advantages accrue from their
simultaneous deployment.