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Proceedings Paper

Interpretation of holographic and shearographic fringes for estimating the size and depth of debonds in laminated plates
Author(s): Huai Min Shang; Fook Siong Chau; Cho Jui Tay; Siew-Lok Toh
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Paper Abstract

Double-exposure holography and shearography are two laser-based techniques which have been used recently for detecting and assessing debonds in laminated plates. When a plate is tested with am incremental partial vacuum pressure between the two exposures, the boundary of the amomalous fringes reveals the shape and size of a debond; the number of these fringes enables estimation of the depth of the debond. Various difficulties are encountered in interpreting these fringes, for example, accurate determination of the number of anomalous fringes which are generally few, and the identification and assessment of overlapping debonds. This paper addresses some of these difficulties and presents methods of overcoming or alleviating them so that the potential of holography and shearography in NDT may be further enhanced.

Paper Details

Date Published: 1 December 1991
Proc. SPIE 1554, Second International Conference on Photomechanics and Speckle Metrology, (1 December 1991); doi: 10.1117/12.57458
Show Author Affiliations
Huai Min Shang, National Univ. of Singapore (Singapore)
Fook Siong Chau, National Univ. of Singapore (Singapore)
Cho Jui Tay, National Univ. of Singapore (Singapore)
Siew-Lok Toh, National Univ. of Singapore (Singapore)

Published in SPIE Proceedings Vol. 1554:
Second International Conference on Photomechanics and Speckle Metrology
Fu-Pen Chiang; Fu-Pen Chiang, Editor(s)

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