Acoustic Field under Pulsed Transmission–Reception at the Surface of an Elliptic Cylinder

Resumo

Longitudinal ultrasonic pulse propagation over the cross section of an elliptic cylinder is modeled for the case of transmission–reception of waves by a contactless electromagnetic acoustic transducer along the cylinder envelope. Modeling is based on ray approximation and finite-element method. Formation of series of multiple reflections within the cross section of an elliptic cylinder is studied both theoretically and experimentally. New informative parameters of determining the cylinder ellipticity by the mirror-shadow electromagnetic acoustic method of multiple reflections are justified: the modulation period of a series of multiple reflection pulses, the delay time of reflected pulses, and the probabilistic-statistical characteristics of the data array of multiple reflection series.