Abstract
We present measured and calculated reflection and transmission coefficients for Rayleigh waves impinging at non- normal incidence on a sharp right-angle edge of an aluminum plate. Although the theory of longitudinal and shear acoustic waves at non-normal incidence on a boundary is well known (1), there are few results for the reflection coefficient of Rayleigh waves other than the case of normal incidence at a discontinuity (2). The needs of SAW touchscreen technology motivated us to fill this gap. A full-field, non-scanning acoustic imaging method based on laser interferometry (3) was used to capture images of Rayleigh waves reflecting off of and transmitting over a plate edge. Fits to such images provided reflection and transmission amplitudes. For the case of a 45° angle of incidence, serendipitous acoustic path geometry enabled an independent measurement via a purely acoustic method. Simulations were used to generate images in the same format as the experimental images, which were then analyzed with the same fitting procedure. Experiment and simulation both show that the transmission amplitude is significant and generally larger than the reflection amplitude at all angles.
Published Version
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