Simultaneous Inversion of Six Parameters for Three-Layered Metal Specimens
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Begun in 1973, the Review of Progress in Quantitative Nondestructive Evaluation (QNDE) is the premier international NDE meeting designed to provide an interface between research and early engineering through the presentation of current ideas and results focused on facilitating a rapid transfer to engineering development.
This site provides free, public access to papers presented at the annual QNDE conference between 1983 and 1999, and abstracts for papers presented at the conference since 2001.
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Abstract
Layered media is used extensively in the aerospace and automotive industries from paint on metal surfaces to actuators with piezoelectric layers. NDE of such materials is used for manufacturing quality control or damage inspection. A method of inversion for thickness and wavespeeds from ultrasonic data using the minimization of the difference between measured and constructed transfer function magnitudes in transmission has been developed [1,2]. Using this method, for a three-layer metal/liquid/metal specimen immersed in water it is possible to invert accurately for up to four parameters, for example, three thicknesses and one wavespeed. Kinra, Wang, Zhu, and Rawal [3] reported thickness measurements on three-layer metal-clad specimens.