Observation of ultrasonic Talbot effect in perforated plates.

The Talbot effect using ultrasonic waves transmitted through a periodic perforated plate is presented. The ultrasonic wave-field at the exit of the perforated plate replicates the perforated pattern at the Talbot distance. Experimental results are validated by an analytical model. The measured propagating wave-field is consistent with the analytical results. The influence of the grating size and the filling fraction on the Talbot effect are also studied, and it is found that both parameters affect the formation of Talbot images.