It has been demonstrated that non-destructive inspection of plates can be performed by using two-dimensional
maps of instantaneous out-of-plane displacements obtained with a self-developed pulsed TV-holography system.
Specifically, the interaction of guided elastic waves with defects produces scattering patterns that contain information
about the defects (position, dimensions, orientation, etc.). For quantitative characterization on this
basis, modeling of the wave propagation and interaction with the defects is necessary. In fact, the development
of models for scattering of waves in plates is yet an active research field in which the most reliable approach
is usually based on the rigorous formulation of elasticity theory. By contrast, in this work the capability of a
simple two-dimensional scalar model for obtaining a quantitative description of the output two-dimensional maps
associated to artificial defects in plates is studied. Some experiments recording the interaction of narrowband
Rayleigh waves with artificial defects in aluminum plates are presented, in which the acoustic field is obtained
from the TV-holography optical phase-change maps by means of a specially developed two-step spatio-temporal
Fourier transform method. For the modeling, harmonic regime and free-stress boundary conditions are assumed.
Comparisons between experimental and simulated maps are included for defects with different shapes.