Beam transmission of water-embedded steel plate at normal incidence. Diffraction effects in the S1 to A3 region

Measurement of the sound transmission through a fluid­?embedded viscoelastic plate at normal incidence can show significant deviations to the plane­?wave theory, experiencing both frequency shift and signal level variation in relation to the plane­?wave theory.

Measurement of the sound transmission through a fluid­?embedded viscoelastic plate at normal incidence can show significant deviations to the plane­?wave theory, experiencing both frequency shift and signal level variation in relation to the plane­?wave theory. These deviations become important when relating measurements to e.g. cut­?off frequencies in the plane?wave theory to determine material parameters of the plate. Models developed, which incorporate a more realistic 3D diffracted piezoelectric transducer beam, explains these phenomena, and using these tools the underlying physics can be studied.