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Proceedings Paper

Nondestructive techniques for detection of delamination in ceramic tile: a laboratory comparison between IR thermal cameras and laser Doppler vibrometers
Author(s): Roberto M. De Andrade; Enrico Esposito; Nicola Paone; Gian Marco Revel
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Paper Abstract

In ceramic tile industry, delamination is one of the more important and difficult problems to detect. Among all the general non-destructive evaluation methods, optical inspection technique seem to be particularly suitable. A method based on acquisition and processing of IR thermal images is proposed. Measurements have been performed by artificial heating by an IR quartz lamp. The performance of the technique has been evaluated experimentally and results show that the examine defects in the measured samples have been correctly detected. Another proposed technique for detection of delaminations and voids in structures is vibration monitoring by a scanning laser doppler vibrometer (SLDV). The basic idea is that a defected area will show as a higher velocity one. Structure excitation may be performed by acoustic means, thus allowing for a remote contactless measurement system. Our tests put in evidence that IR thermal images provide a very fast defect detection method appropriate for on line applications, while SLDV results show a better geometrical definition of defects shapes.

Paper Details

Date Published: 8 February 1999
PDF: 11 pages
Proc. SPIE 3585, Nondestructive Evaluation of Aging Materials and Composites III, (8 February 1999); doi: 10.1117/12.339868
Show Author Affiliations
Roberto M. De Andrade, Univ. Federal de Minas Gerais (Italy)
Enrico Esposito, Univ. degli Studi di Ancona (Italy)
Nicola Paone, Univ. degli Studi di Ancona (Italy)
Gian Marco Revel, Univ. degli Studi di Ancona (Italy)

Published in SPIE Proceedings Vol. 3585:
Nondestructive Evaluation of Aging Materials and Composites III
George Y. Baaklini; Carol A. Nove; Eric S. Boltz, Editor(s)

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