TITLE

Eddy current tomography of multi-layered aluminum structures

AUTHOR(S)
Chady, T.; Enokizono, M.; Todaka, T.; Tsuchida, Y.; Sikora, R.; Anan, M.
PUB. DATE
May 2000
SOURCE
AIP Conference Proceedings;2000, Vol. 509 Issue 1, p425
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
This paper proposes a high resolution ECT system for testing of multi-layered aluminum structures. In this system a precise crack imaging is achieved by using spectrograms obtained from the eddy-current probe multifrequency response. A complex signal containing selected sinusoidal components is used as excitation. Selected methods of digital signal processing are used and finally the results are obtained in a form of spectrograms. The spectrogram is a two-dimensional display of the relative amplitude of the frequency components of a signal from the pickup coil over the sensor position. By using the spectrogram it is possible to determine position and shape of flaws. The determination of an unknown defect size, shape, and position from eddy-current probe response is an inverse problem. To solve this problem authors have successfully applied a newly developed neural network model. In order to demonstrate advantages of the system a set of experiments was carried out. Each specimen consists of five 1 mm thick plates of aluminum. The flaws are wholes of diameter from 0.5 mm up to 4 mm made in single layers. Various kinds of flaw configurations were tested. The results of experiments confirm very good spatial resolution of the system. © 2000 American Institute of Physics.
ACCESSION #
6029101

 

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