Reflection at a liquid–solid interface of a transient ultrasonic field radiated by a linear phased array transducer

• The study of the reflection at the liquid solid interface of the ultrasonic waves.
• The transient ultrasonic waves are radiated by a phased array transducer.
• The developed model is based on the angular spectrum method in the transient case.
• The results have been compared to those obtained with a finite element method.
• The results highlighted the specular reflection and the non specular reflection.

In order to put in evidence the specular reflection and the non-specular reflection in the transient case, we have used a model for the study of the transient ultrasonic waves radiated by a linear phased array transducer in a liquid and reflected by a solid plane interface. This method is an extension of the angular spectrum method to the transient case where the reflection at the plane interface is taken into account by using the reflection coefficient for harmonic plane waves.The results obtained highlighted the different components of the ultrasonic field: the direct and edge waves as well as the longitudinal head waves or leaky Rayleigh waves. The transient representation of these waves have been carefully analyzed and discussed by the rays model. Instantaneous cartographies allowed a clear description of all the waves which appear at the liquid–solid interface.The obtained results have been compared to those obtained with a finite element method package.