Highlight lateral waves experimentally in the case of acoustic transmission through the air-water plane interface
Mise en évidence des ondes latérales expérimentalement dans le cas de la transmission acoustique à travers le dioptre plan air-eau
Résumé
A lot of work has been done on acoustic propagation through an inhomogeneous fluid, both for monochromatic and transient signals. These works are often theoretical and far from experiment. The aim of our study is to link theoretical and numerical results to results obtained from an experiment. We consider here the case of a monochromatic point-source. Experimentally, we show, by introduction of absorbing planes the existence and the properties of different contributions (geometric and lateral) that intervene in the total refracted field, in accord with simulated theoretical results, with a plane air-water interface. The study of the total transmitted pressure field points out, in accordance to theoretical studies, some interference regions dependent on the frequency emits by the source and the importance that lateral wave can play in particular cases.