Abstract
For online monitoring and prediction of surface or near-surface changes such as corrosion, cracks and crack-like defects, propagation of surface acoustic waves (SAW) and pseudo surface acoustic waves (PSAW) in a layered AlN/Diamond/γ-TiAl structure is investigated. Depending on the layer thicknesses and the frequency, both SAW and PSAW may exist in the AlN/Diamond/γ-TiAl structure. True SAW or Rayleigh waves exist only in the range of small normalized waver numbers kh p and kh d . Beyond this range, PSAW exist. Low-loss PSAW with high velocities have certain advantages compared to SAW. Since surface or near-surface changes and defects are closely related to the propagation characteristics of SAW and PSAW, both SAW and PSAW can be used to detect and characterize the location and the size of such surface or near-surface changes and flaws. Special attention of the paper is devoted to the analysis of the propagation of SAW and PSAW, and the computation of the electro-mechanical coupling coefficient in a layered AlN/Diamond/γ-TiAl structure.
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