Abstract
This work shows that it is possible to obtain information about more than one parameter from acoustic field information. A variety of ultrasonic Lamb wave modes were utilized to reconstruct thickness and density of an isotropic plate. An image reconstruction of one parameter (thickness of a plate) was carried out for four cases, i.e., the lowest symmetrical and antisymmetrical modes, and the fastest symmetrical and antisymmetrical Lamb waves among multiple modes. For two parameter reconstructions (thickness and density), the image processing was performed using the lowest symmetrical and antisymmetrical modes simultaneously. In this work, a modified version of algebraic reconstruction technique (ART), which is a form of finite-series expansion method, was employed to reconstruct the ultrasonically computed tomographic images. Results from several sample geometries are presented.
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Choi, JS., Kline, R.A. Multi-parameter Lamb wave tomography. KSME International Journal 14, 1–10 (2000). https://doi.org/10.1007/BF03184765
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DOI: https://doi.org/10.1007/BF03184765