Abstract
A technique for liquid surface level measuring is described by using a leaky Lamb wave device. An interdigital transducer on a piezoelectric thin plate operating in a liquid excites a leaky Lamb wave along the liquid-solid interface. The wave is mode-converted to a longitudinal wave into the liquid. Near the critical value of the product of the frequency and the plate thickness, an ultrasonic beam is radiated in the direction normal to the plate surface. The frequency is 3.4 times higher than that of the thickness mode vibration. This is essential for high resolution in the liquid level measurement system. The average error of the measured level is 200 µm for a depth of 100 mm and the deviation is within 0.1% for a temperature change of 30°C.
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