Event Title

Analysis of Dispersive Waves Using the Wavelet Transform

Location

Snowbird, UT, USA

Start Date

1-1-1999 12:00 AM

Description

Lamb waves have long been recognized to be a valuable tool in the nondestructive testing of plates and shells. The patterns of dispersion which characterize the propagation of Lamb waves through a material may be used to determine the thickness of a plate, the elastic properties of materials, as well as the condition and integrity of the sample. Unfortunately, the analysis of Lamb wave signals is complicated by the existence of at least two modes at any given frequency [1]. To efficiently determine the dispersive characteristics of a plate, it is therefore necessary to have a technique for analyzing broadband multimode signals. Methods for the time-frequency analysis of signals are especially useful in determining dispersion curves, since they reveal the time variation of each frequency component of the signal.

Book Title

Review of Progress in Quantitative Nondestructive Evaluation

Volume

18A

Chapter

Chapter 3: Simulations, Signal Processing, Tomography, and Holography

Section

Signal Processing and Analysis

Pages

687-694

DOI

10.1007/978-1-4615-4791-4_88

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

Analysis of Dispersive Waves Using the Wavelet Transform

Snowbird, UT, USA

Lamb waves have long been recognized to be a valuable tool in the nondestructive testing of plates and shells. The patterns of dispersion which characterize the propagation of Lamb waves through a material may be used to determine the thickness of a plate, the elastic properties of materials, as well as the condition and integrity of the sample. Unfortunately, the analysis of Lamb wave signals is complicated by the existence of at least two modes at any given frequency [1]. To efficiently determine the dispersive characteristics of a plate, it is therefore necessary to have a technique for analyzing broadband multimode signals. Methods for the time-frequency analysis of signals are especially useful in determining dispersion curves, since they reveal the time variation of each frequency component of the signal.