Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/58882
Title: Use of holographic phase shifting in assessing unbonds in GRP plates
Authors: Soh, C.C.
Shang, H.M. 
Chau, F.S. 
Hung, Y.Y. 
Issue Date: Oct-1994
Source: Soh, C.C.,Shang, H.M.,Chau, F.S.,Hung, Y.Y. (1994-10). Use of holographic phase shifting in assessing unbonds in GRP plates. Journal of Engineering Materials and Technology, Transactions of the ASME 116 (4) : 545-549. ScholarBank@NUS Repository.
Abstract: During holographic inspection of glass fiber reinforced plastic (GRP) laminated plates, perturbation in the fringe patterns not only reveals the presence of an unbond but also enables estimation of its depth. The accuracy of estimation depends, among other factors, on the accuracy in determining the fringe orders within the boundary of perturbation. This study shows that phase shifting using a single reference beam enables determination of fractional fringe orders at any point on the test surface. When applied to the assessment of the detected unbond, this simple technique gives a more accurate estimation of the unbond depth than conventional holography.
Source Title: Journal of Engineering Materials and Technology, Transactions of the ASME
URI: http://scholarbank.nus.edu.sg/handle/10635/58882
ISSN: 00944289
Appears in Collections:Staff Publications

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