Numerical modeling and measurement by pulsed television holography of ultrasonic displacement maps in plates with through-thickness defects

We present a novel numerical modeling of ultrasonic Lamb and Rayleigh wave propagation and scattering by through-thickness defects like holes and slots in homogeneous plates, and its experimental verification in both near and far field by a self-developed pulsed TV holography system. In contrast to rigorous vectorial formulation of elasticity theory, our model is based on the 2-D scalar wave equation over the plate surface, with specific boundary conditions in the defects and plate edges. The experimental data include complex amplitude maps of the out-of-plane displacements of the plate surface, obtained by a two-step spatiotemporal Fourier transform method. We find a fair match between the numerical and experimental results, which allows for quantitative characterization of the defects

Media 4: Three-dimensional optoacoustic tomography at video rate

Originally published in Optics Express on 24 September 2012 (oe-20-20-22712

Media 2: Three-dimensional optoacoustic tomography at video rate

Originally published in Optics Express on 24 September 2012 (oe-20-20-22712

Media 1: Three-dimensional optoacoustic tomography at video rate

Originally published in Optics Express on 24 September 2012 (oe-20-20-22712