Abstract
Longitudinal wave piezoelectric transducers of finite diameter which are placed in contact with a buffer rod or a material under test excite weak spurious shear wave modes. We have used a spatial frequency analysis to predict the level of the shear-longitudinal and shear-shear mode as compared to the level of the main longitudinal mode of interest. We find good agreement between theory and experiments for 50-MHz transducers made with PZT, PSN, or LiNbO3 on a quartz buffer rod.
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