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7 July 1995 Crack detection in concrete using real-time ESPI technology
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Based on laser optics, speckle interferometry is sensitive to very small changes in displacement or deformation. Electronic speckle pattern interferometry (ESPI) combines optics and electronics together to provide full-field observation and analysis with accuracy and sensitivity in a sub-micron range. As a state-of-the-art non-destructive testing/evaluation technology (NDT/NDE), electronic speckle pattern interferometry (ESPI) was successfully used to detect very small cracks in concrete. The fast image processing made it possible to conduct real-time testing on concrete structures. The laboratory experiments have also shown that it is possible to bring the ESPI technology to field applications, such as NDE of aging airport pavements, bridges, and other aging infrastructure.
© (1995) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Zongliang Jia and Surendra P. Shah "Crack detection in concrete using real-time ESPI technology", Proc. SPIE 2455, Nondestructive Evaluation of Aging Aircraft, Airports, Aerospace Hardware, and Materials, (7 July 1995);

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