1 March 1994 Application of three interferometric techniques to the NDE of composite materials
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Abstract
This paper examines the application of Electronic Speckle Pattern Interferometry (ESPI), Electronic Shearography (ES), and Laser Doppler Vibrometry (LDV) to the detection of damage in fiber reinforced composite materials. Each of these techniques is sensitive to a different displacement parameter. ESPI detects changes in the out-of-plane displacement, ES indicates the change in the surface slope and LDV provides dynamic information on the structure (dynamic stiffness and loss factor). Experiments were done to evaluate the potential of each of these techniques for detecting impact damage in fiber reinforced composite materials. The results indicated that the three methods provide complimentary information. LDV is a fast screening procedure while ESPI and ES can provide information on the extent and location of the damage.
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James P. Nokes, Gary L. Cloud, "Application of three interferometric techniques to the NDE of composite materials", Proc. SPIE 2004, Interferometry VI: Applications, (1 March 1994); doi: 10.1117/12.172592; https://doi.org/10.1117/12.172592
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