The size effects of a rigid reflector in the scattering of transient ultrasonic field

A model is proposed to assess the transient ultrasonic field radiated by a planar transducer and scattered by a target with a known dimension and geometry. The approach is based on the hypothesis of linear acoustics for a perfectly rigid reflector immersed in an isotropic, homogeneous and lossless fluid. The detected acoustic pressure is explained in terms of the plane and edge waves. In order to determine the boundary effects on the detected pressure, targets of different sizes were used in our simulations. An experimental verification of the proposed model is presented for the case of circular planar targets with different radii made of duralumin and immersed in distilled water. In general, the theoretically predicted results are in good agreement with the experimentally measured results.