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Published on: November 11, 2013
Time reversal of water waves
A Przadka1, S Feat, P Petitjeans
1Physique et Mécanique des Milieux Hétérogènes, PMMH, UMR CNRS 7636-ESPCI-UPMC Université Paris 6-UPD Université Paris 7, Paris, France.
Abstract:
We present time reversal experiments demonstrating refocusing of gravity-capillary waves in a water tank cavity. Owing to the reverberating effect of the cavity, only a few channels are sufficient to reconstruct the surface wave at the point source, even if the absorption is not negligible. Space-time-resolved measurements of the waves during the refocusing allow us to quantitatively demonstrate that the quality of the refocusing increases linearly with the number of reemitting channels. Numerical simulations corresponding to water waves at larger scales, with negligible damping, indicate the possibility of very high quality refocusing.
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