Abstract
Measurements of absolute sound velocity in solids can be performed automatically by the phase sensitive technique. This technique is based on the relationship between frequency changes and known phase shifts. Frequency changes, however, also result in unknown phase shifts due to reflections at the transducer-bond interface, and to dispersion in the sample. To avoid this problem, we have devised a modified version of the technique which is described here. We also report results of absolute velocity measurements using the new version and compare them with similar measurements obtained with the old one.
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