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Proceedings Paper

Crack detection in concrete using real-time ESPI technology
Author(s): Zongliang Jia; Surendra P. Shah
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Paper Abstract

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.

Paper Details

Date Published: 7 July 1995
PDF: 7 pages
Proc. SPIE 2455, Nondestructive Evaluation of Aging Aircraft, Airports, Aerospace Hardware, and Materials, (7 July 1995); doi: 10.1117/12.213554
Show Author Affiliations
Zongliang Jia, Northwestern Univ. (United States)
Surendra P. Shah, Northwestern Univ. (United States)

Published in SPIE Proceedings Vol. 2455:
Nondestructive Evaluation of Aging Aircraft, Airports, Aerospace Hardware, and Materials
Tobey M. Cordell; Raymond D. Rempt, Editor(s)

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