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Proceedings Paper

Crack damage detection of structures using distributed electrical-time-domain reflectometry sensors
Author(s): Mark W. Lin; Ayo O. Abatan; Wei-Min Zhang
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Paper Abstract

Electrical time domain reflectometry (ETDR) stress/strain sensing technique has been successfully used in geotechnical applications to detect rock deformation and longwall movement. The ETDR sensing method appears to be practical for health monitoring applications of civil concrete structures since durable sensor media can be used. In this paper, feasibility of using an embedded coaxial ETDR cable to detect crack damages in a structure is investigated. Tension and bending tests were performed on edge-notched photoelastic epoxy specimens with embedded coaxial ETDR sensing cables. The test results show that crack lines passing through the embedded sensing cable can be detected. The TDR signal response of the sensing cable reveals not only the location of the crack damage site but also indicates the relative magnitude of the crack opening. The results of the current study strongly suggest that the ETDR sensing technique possesses a great potential for the application of health monitoring of large civil concrete structures.

Paper Details

Date Published: 17 June 1998
PDF: 8 pages
Proc. SPIE 3325, Smart Structures and Materials 1998: Smart Systems for Bridges, Structures, and Highways, (17 June 1998); doi: 10.1117/12.310605
Show Author Affiliations
Mark W. Lin, Clark Atlanta Univ. (United States)
Ayo O. Abatan, Clark Atlanta Univ. (United States)
Wei-Min Zhang, Clark Atlanta Univ. (United States)

Published in SPIE Proceedings Vol. 3325:
Smart Structures and Materials 1998: Smart Systems for Bridges, Structures, and Highways
S.-C. Liu, Editor(s)

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