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Determination of embedded layer properties using adaptive time-frequency domain analysis.

L Wang¹, B Xie, S I Rokhlin

¹Edison Joining Technology Center, The Ohio State University, Nondestructive Evaluation Program, Columbus 43221, USA.

The Journal of the Acoustical Society of America

|June 27, 2002

Summary

A new model determines acoustic and geometric properties of embedded layers using normal and oblique incidence. This method accurately reconstructs properties even when layer reflections overlap, improving material characterization.

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Area of Science:

Acoustics
Materials Science
Solid Mechanics

Background:

Characterizing embedded layers in multilayered solids is crucial for material science and engineering.
Existing methods for determining acoustical and geometrical properties often face limitations with overlapping reflections.

Purpose of the Study:

To develop a general inversion model for simultaneously determining the complete set of acoustical and geometrical properties of an embedded layer.
To extend existing inversion techniques to handle overlapping reflections in time-domain signals.

Main Methods:

A general model is developed for an isotropic layer embedded within multilayered solids (isotropic or anisotropic).
The model utilizes two measurements: one at normal incidence and one at oblique incidence.

Related Experiment Videos

It extends Lavrentyev and Rokhlin's method by incorporating time-domain gating to manage overlapping reflections.

Main Results:

The model successfully determines density, elastic moduli (longitudinal and shear), layer thickness, and loss factors.
Sensitivity, stability against data scatter, and the influence of oblique incidence angle are evaluated.
The study discusses the impact of plane-wave versus beam approximation in the inverse algorithm.

Conclusions:

The developed inversion model provides a robust method for characterizing embedded layers in complex layered solids.
The technique is effective even when reflections from different layers overlap, broadening its applicability.
Experimental validation demonstrates successful reconstruction of adhesive layer properties.