Ultrasonic anomalies in the spectrum of acoustic waves diffracted by periodic interfaces

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Abstract
The energy distribution of elastic waves reflected from corrugated periodic solid surfaces is investigated. Broadband pulse echo experiments using ultrasonic spectroscopy are carried out for surfaces with a triangular profile. Sharp discontinuities observed in the received spectrum are interpreted as anomalies first introduced by R. W. Wood [Philos. Mag. 4, 396 (1902)]. These minima are identified as the mode-converted signals along the interface with bulk or surface wave velocities. The observed anomalies may be used to characterize interfaces and quality of bonding.