No abstract

No abstract

No abstract

In this paper we present a numerical prediction, by the angular spectrum method, of the impulse ultrasonic field radiated, through a liquid-solid interface, by a linear transducer with a uniform or not uniform vibration profile. The pressure field is calculated in the propagation liquid medium, then in an homogeneous and isotropic solid medium after its passage through a plane interface by taking into account the refraction phenomenon. The obtained results are interpreted in terms of plane waves and edge waves. Arrivals times of the waves and the corresponding waveforms are correctly predicted as well in normal incidence as in oblique incidence. Indeed, a sensitive improvement of space-temporal distributions of the field in longitudinal and transverse mode is located. Particularly, a maximum of the energy is located on the refracted axis of the transducer and a good agreement is obtained between the slope of the refracted beam and the expected slope.

No abstract