Reflected and Transmitted Fields of Focused Ultrasonic Waves

We present the results of calculated reflection field from a glass block surface and calculated reflection and transmission fields from a copper plate by focused ultrasonic waves in water using Fourier transform method. Calculated results are in good agreement with those of experiments. It is shown that the striation in the reflection and transmission fields of the copper plate are interference fringes of two plane-waves reradiated from corresponding Lamb modes.