Interpretation of holographic and shearographic fringes for estimating the size and depth of debonds in laminated plates

Huai Min Shang; Fook Siong Chau; Cho Jui Tay; Siew-Lok Toh

doi:10.1117/12.57458

1 December 1991 Interpretation of holographic and shearographic fringes for estimating the size and depth of debonds in laminated plates

Huai Min Shang, Fook Siong Chau, Cho Jui Tay, Siew-Lok Toh

Author Affiliations +

Proceedings Volume 1554, Second International Conference on Photomechanics and Speckle Metrology; (1991) https://doi.org/10.1117/12.57458
Event: San Diego, '91, 1991, San Diego, CA, United States

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.

Citation Download Citation

Huai Min Shang, Fook Siong Chau, Cho Jui Tay, and Siew-Lok Toh "Interpretation of holographic and shearographic fringes for estimating the size and depth of debonds in laminated plates", Proc. SPIE 1554, Second International Conference on Photomechanics and Speckle Metrology, (1 December 1991); https://doi.org/10.1117/12.57458

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