Spatiotemporal characterization of the water-air interface deformation induced by a transient acoustic radiation pressure

Contactless deformation of interface between two media of different impedances can be performed using an acoustic beam that generates a surface acoustic radiation pressure (ARP) which induces a deformation of this interface. In this work, we propose to study both spatial and temporal characteristics of the interface deformation induced by a non-continuous excitation. An experimental setup using a polychromatic confocal sensor has been developed for time tracking the displacement of the water-air interface. Results are compared to a numerical approach using the Finite-Element Method (FEM). Numerical and experimental results for a transient non-steady state excitation are in good agreement, and allow to accurately predict the shape of the interface deformation for a given set of parameters. This study opens the way for further applications requiring to remotely control the shape of a fluid interface.