Abstract
An improved differential phase−comparison method for the measurement of small changes in ultrasonic velocity is described. Velocity dispersion measurements can be carried out in the frequency range from 3.3 to 70.2 MHz; the relative accuracy is one part in 105; only 12 cm3 of liquid are required. Results are presented for aqueous and organic solutions, which are in good agreement with known ultrasonic−absorption data. Subject Classification: 35.24, 35.35.
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