Experimental Evaluation of the Total-Reflection Method of Determining Ultrasonic Velocity

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Abstract
Ultrasonic velocities in a solid can be determined by finding the incident angle of a beam at a liquid-solid interface that produces maximum reflection in the liquid. Experiments were performed to find the accuracy with which the sine of the angle of maximum reflection could be resolved, the minimum thickness of solid on which the method could be used, and the effect of using a rubber “boot” to couple the beam from the liquid to the solid. Using a specially constructed transducer positioning device, the sine of the incident angle for peak reflection could be determined within a maximum error of less than ±0.04% at an angle of 13.8°. Unique maximum reflection peaks were obtained on samples having thicknesses greater than 13.5 wave-lengths of the incident wave. No measureable error was introduced by using a boot coupling technique.

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