Lamb wave interactions through dispersion 2D filters

Composite Material Defects Characterization Using Leaky Lamb Wave Dispersion Data

Leaky Lamb waves (LLW) propagation in composite materials has been studied extensively since it was first observed in 1982. The wave is induced using a pitch-catch arrangement and the plate wave modes are detected by identifying minima in the reflected spectra to obtain the dispersion data. The wave behavior in multi-orientation laminates was well documented and corroborated experimentally with...

Experimental Studies of Wave Transmission through Single Perforated Sheets and Upright Perforated Wave Filters

Characterization of thin films using generalized lamb wave dispersion relations

We used the Continuous Wave Scanning Acoustic Microscope to characterize thin film materials. The measurement of the dispersion curve of surface waves and the inversion of this dispersion equation relation, allow to determine the elastic constants, the density or the thickness of a thin layer on a substrate. Besides, it is possible to have qualitative information on the adhesion properties of t...

Efficient Perturbation Analysis of Lamb Wave Dispersion Curves

Lamb waves are frequently used in nondestructive evaluation and are proposed for structural health monitoring applications. While many numerical methods to obtain dispersion curves for Lamb waves have been developed and implemented, in general they are time consuming and do not lend themselves to analyses involving the perturbation of parameters such as the small thickness and wave speed change...

Pzt-on-silicon Rf-mems Lamb Wave Resonators and Filters

Nowadays, wireless communication systems cover numerous standards where almostfor each one, a different frequency band has been allocated. By increasing the num-ber of wireless devices, the radio spectrum is quickly becoming overcrowded, ask-ing for smart “cognitive radio” devices, which detect and exploit unused spectrum.This means that a radio system which can cover a wide fre...