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A Simple Measurement Technique for Small Relative Velocity Changes of GHz Acoustic Waves,
CORNELL UNIV ITHACA N Y MATERIALS SCIENCE CENTER
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A simple method for measuring small relative acoustic velocity changes of GHz acoustic waves over a temperature range from 1.7 to 50K has been developed. It has been possible to extend the conventional pulse-echo method to the gigahertz frequency range by displaying the intermediate frequency 60 MHz on an oscilloscope and recording the changes in the phase of the IF associated with a chosen echo as a function of temperature. A precision of about 10 ppm can be achieved. Results on KClLi and KClCN- illustrate the usefulness of the technique. Author
APPROVED FOR PUBLIC RELEASE