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Article
A Novel TDR-Based Coaxial Cable Sensor for Crack/Strain Sensing in Reinforced Concrete Structures
IEEE Transaction on Instrumentation and Measurement
  • Shishuang Sun
  • David Pommerenke, Missouri University of Science and Technology
  • James L. Drewniak, Missouri University of Science and Technology
  • Genda Chen, Missouri University of Science and Technology
  • Liang Xue
  • Michael A. Brower
  • Marina Koledintseva, Missouri University of Science and Technology
Abstract

Novel coaxial cable sensors that feature high sensitivity and high spatial resolution are developed for health monitoring of concrete structures using a time-domain reflectometry (TDR). The new sensor was designed based on the topology change of its outer conductor, which was fabricated with tightly wrapped commercial tin-plated steel spiral covered with solder. The cracks that developed within concrete structures will lead to out-of-contact of local steel spirals. This topology change results in a large impedance discontinuity that can be measured with a TDR. A simplified equivalent transmission line model and numerical full-wave simulations using finite-difference time-domain techniques were used to optimize the sensor design. The sensors under test demonstrated high sensitivity and the capability of multiple-crack detection. A plasma-sprayed coating technique was employed to improve sensor uniformity. Engineering implementation issues, e.g., signal loss, signal postprocessing, and sensor design optimization, were also addressed.

Department(s)
Electrical and Computer Engineering
Second Department
Civil, Architectural and Environmental Engineering
Keywords and Phrases
  • Coaxial Cable,
  • Crack/Strain Sensor,
  • Plasma Spray,
  • Sensitivity,
  • Signal Loss,
  • Spatial Resolution,
  • Time-Domain Reflectometry
Document Type
Article - Conference proceedings
Document Version
Final Version
File Type
text
Language(s)
English
Rights
© 2009 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.
Publication Date
8-1-2009
Citation Information
Shishuang Sun, David Pommerenke, James L. Drewniak, Genda Chen, et al.. "A Novel TDR-Based Coaxial Cable Sensor for Crack/Strain Sensing in Reinforced Concrete Structures" IEEE Transaction on Instrumentation and Measurement (2009)
Available at: http://works.bepress.com/david-pommerenke/21/