Dispersion Relations in Plate Structures Studied with a Scanning Laser Vibrometer

Scanning laser vibrometric (SLV) measurements offer a powerful tool to record and visualize the wave propagation in plates with isotropic and anisotropic properties. Snapshots and B-scans provide a good qualitative overview of the dis- persion, but also numerical relations can be derived from SLV measurements, as it is demonstrated. A technique described in literature in the context of fluid coupled and air borne ultrasound is applied for laser detection of wave fields. While for isotropic plates a good quantitative agreement between experimentally determined dispersion curves and the well known Lamb wave numerical solutions can be obtained, it needs further work for anisotropic plates, to be published in a forthcoming paper.