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Article
Signal Loss, Spatial Resolution, and Sensitivity of Long Coaxial Crack Sensors
SPIE Proceedings: Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems
  • Genda Chen, Missouri University of Science and Technology
  • James L. Drewniak, Missouri University of Science and Technology
  • David Pommerenke, Missouri University of Science and Technology
  • Shishuang Sun
Abstract
Configuration-based coaxial cable sensors have recently been developed to detect cracks in reinforced concrete (RC) structures. These sensors have shown a high sensitivity when applied to several short RC flexural members. However, the signal losses resulting from a long cable sensor may distort the initial waveform of the electromagnetic wave propagating along the cable, thereby compromising the spatial resolution and sensitivity of this sensor. The signal losses consist of the contributions from the skin effect of conductors, energy absorption in the dielectric material, and impedance mismatch loss due to multiple signal reflections resulting from discontinuities caused by the separation between the adjacent spirals, which acts as the outer conductor of a cable sensor. This paper summarizes the basic physics of signal losses in cable sensors, and investigates the impact of the signal losses on the spatial resolution and sensitivity of a cable sensor over distance. Several methods are proposed to simulate and quantify various factors affecting the signal losses
Department(s)
Civil, Architectural and Environmental Engineering
Second Department
Electrical and Computer Engineering
Third Department
Materials Science and Engineering
Keywords and Phrases
  • Coaxial Cable Sensors,
  • Reinforced Concrete (RC) Structures,
  • Signal Loss
Document Type
Article - Journal
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2004 SPIE -- The International Society for Optical Engineering, All rights reserved.
Publication Date
1-1-2004
Citation Information
Genda Chen, James L. Drewniak, David Pommerenke and Shishuang Sun. "Signal Loss, Spatial Resolution, and Sensitivity of Long Coaxial Crack Sensors" SPIE Proceedings: Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems Vol. 5391 (2004)
Available at: http://works.bepress.com/david-pommerenke/174/