Time-frequency analysis of broadband dispersive waves using the wavelet transform

Wooh, Shi-Chang; Veroy, Karen
May 2000
AIP Conference Proceedings;2000, Vol. 509 Issue 1, p831
Academic Journal
We explore the use of the Morlet wavelet transform in the time-frequency analysis of dispersive waves. The Morlet wavelet transform is a windowed Fourier transform wherein the window size varies with frequency. This allows for more effective analysis of the time-frequency characteristics of broadband signals. The Morlet wavelet transform coefficients evaluated at a particular center frequency indicate the group delay or time of arrival of a wave group whose Fourier spectrum is centered at the said frequency. The method is applied to both simulated and experimental data. In this study, multi-mode Lamb waves induced by laser generated ultrasound in a thin plate are considered. © 2000 American Institute of Physics.


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