Abstract
A leaky Lamb wave transducer composed of a thin piezoelectric ceramic plate and a thin glass plate is described for the purpose of measuring the sound velocities in liquids. The propagation characteristics of leaky Lamb waves are numerically analyzed first and the operational characteristics of the transducer are experimentally demonstrated by measuring the frequency dependence of the admittance and the radiation angle of the longitudinal wave into the liquid. The sound velocities in the saline solution of different concentrations are estimated by sweeping the operation frequency. This transducer has an operation mode with a wide frequency range in which three propagation modes of leaky Lamb waves are involved, which is favorable for this application.
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