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The wavelet response as a multiscale NDT method.

Y Le Gonidec¹, F Conil, D Gibert

¹Géosciences Rennes (CNRS UMR 6118), Campus de Beaulieu, Université Rennes 1, 35042 Cedex, Rennes, France.

|July 11, 2003

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This study introduces the wavelet transform and wavelet response methods for analyzing material interfaces using reflected waves. These techniques efficiently detect and characterize discontinuities in acoustical impedance profiles.

Area of Science:

Materials Science
Wave Physics
Signal Processing

Background:

Analyzing material interfaces is crucial for non-destructive testing and material characterization.
Traditional methods may face limitations in detecting complex or closely spaced discontinuities.

Purpose of the Study:

To introduce and validate the wavelet transform for detecting acoustical impedance discontinuities.
To present the wavelet response method for remote characterization of velocity profiles.
To experimentally verify the application of these methods on finite thickness planar reflectors.

Main Methods:

Wavelet transform for analyzing reflected waves and detecting impedance profile discontinuities.
Wavelet response method for remote probing of velocity profiles via wave propagation.

Related Experiment Videos

Experimental acoustic tank measurements for characterizing planar reflectors.

Main Results:

The wavelet transform effectively detects and characterizes isolated and clustered discontinuities.
The wavelet response method is shown to be equivalent to the wavelet transform when multiple scattering is negligible.
Experimental results demonstrate successful characterization of finite thickness planar reflectors.

Conclusions:

Wavelet-based methods offer an efficient framework for interface analysis using reflected waves.
The wavelet response method extends wavelet analysis to remotely probed velocity profiles.
These techniques provide valuable tools for material characterization and defect detection.