HIGH-ACCURACY DIFFERENTIAL MEASUREMENT OF ULTRASONIC VELOCITY IN LIQUIDS

An improved technique for measuring very accurately the difference in sound velocity between two liquids is described. The technique, which can be used over a frequency range from 1 to 100 MHz, uses a differential cell that is completely submerged in a thermostatically controlled fluid and a phase-sensitive detection scheme accurate to 2×10-4 signal periods. Measurements of the velocity difference between water and dilute NaCl solutions (3×10-5 to 6.6×10-4 M), accurate to ±0.02 cm s-1 (relative accuracy 1 part in 107), are presented.