Water-air interface deformation induced by a transient acoustic radiation force

At a water-air interface, the acoustic radiation pressure (ARP), generates a deformation of the interface. In this work, we propose to study the interface deformation for non-continuous excitations. A particular attention is given to the maximum height at the center of the deformation. An experimental setup has been developed to evaluate the height of the deformation for different durations and amplitudes of the transient acoustic radiation pressure. The results are compared to a numerical approach using the Finite-Element Method (FEM). Finally, the numerical and experimental results for a transient excitation have been compared to results obtained for continuous excitation in order to propose a pertinent optimization of the excitation parameters. Results are in good agreement with the theory for a continuous excitation, and encouraging for further improvement on both numerical and experimental methods.