CHANGE OF TEMPORAL SHAPE OF PULSED ULTRASONIC WAVE-FORM BY THE REFLECTION PHENOMENON

Theoretical studies previously performed in a sinusoidal model1,2 have enabled an analytical explanation of reflection and transmission phen omena generally accompanied by mode conversion. The numerous results p ublished3-6 refer to coefficients expressed in a complex notation. In this paper, we study the influence of these complex coefficients on th e shape of the waveform in the transient mode and we apply these resul ts to the specific case of a liquid-solid interface. To verify the val idity of the predictions given by numerical simulation, we compare the amplitude and shape of the measured and simulated ultrasonic wave sig nal of a pulsed ultrasonic wave.