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A leaky Lamb wave sensor is based on the principle of multiple mode conversions in an acoustic waveguide. An initial ultrasonic Lamb wave propagates on a plate, but leaks energy to an adjacent liquid. Therein the exited wave propagates zigzag between the radiating and a second plate. At each reflection it partly reconverts, leading to a characteristic fingerprint in the received signals which has to be evaluated. Therefor a new method will be presented taking into account that all the liquid’s state variables (sound velocity, density, temperature and viscosity) are influencing the received signal parameters. Additional aspects of this contribution are the parameterization of dispersion relations and the estimation of uncertainty in the measurement of sound velocities with the new method.

A3.3 - Utilizing Leaky Lamb Waves in an Acoustic Waveguide for the Measurement of Liquid Properties