Abstract
The theory and experimental results for a method of measuring the sound velocity difference in two liquids are described. The compressional wave is radiated into a liquid from an interdigital transducer. The substrate surface without the interdigital electrodes is not in contact with the liquid. The phase difference between two delayed signals passed through two liquid cavities, which is converted to a dc voltage via a phase comparating circuit, corresponds to the sound velocity difference. An experimental confirmation of the propriety of the values obtained by the method is given in water with different temperatures.
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