Nonlinear Interface Wave Propagation at the Interface between a Solid and a Liquid

摘要

We have used laser line source excitation at the interface between colored water and glass to excite highly nonlinear Scholte waves. The nonlinear interface wave propagation was modelled and numerically simulated using an extension of the simple-wave equation for bulk waves. We have shown that the bulk wave theory also holds for the interface waves in our experiment. A fit of the experimental data with theory revealed a usual nonlinear coefficient, however combined with an anomalously large attenuation. Possible attenuation mechanism were discussed and verified. The results suggest a high potential for laser interface wave ultrasonics for the study of acoustic nonlinearity in liquids and solids.