Rapid and Precise Measurement System for Ultrasonic Velocity by Pulse Correlation Method Designed for Chemical Analysis

摘要

We developed an automatic measurement system for ultrasonic velocity in the megahertz region particularly designed for materials science. The ultrasonic pulse method is fully supported by digital equipment and the correlation function of the 1st and 2nd pulse echoes is numerically obtained from the ultrasonic velocity precisely determined to a relative accuracy of 10~(-6). An ultrasonic corner reflector is also employed to realize the high reproducibility of the measurement without adjusting the parallelism of the countering transducer and reflector. The performance of the system is examined by determining the concentration dependence of sound velocity in an electrolyte solution in a dilute range.