Wave propagation in an acoustic wave guide sensor for liquids driven by pulsed excitation of surface acoustic waves

The wave propagation in an acoustic wave guide sensor filled with liquids and driven by pulsed excitation of Lamb waves on glass plates forming the boundaries of the wave guide has been analyzed with respect to the formation of different wave groups in the receiver signal. The results of model calculations of the wave propagation were compared with measured transit times. Evidence is provided for the capability of this sensor with respect to the detection of gas bubbles in liquids and the tracking of their movement.