Signal Loss, Spatial Resolution, and Sensitivity of Long Coaxial Crack SensorsProceedings Volume 5391, Smart Structures and Materials 2004: Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems
AbstractConfiguration-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.
Meeting NameSmart Structures and Materials (2004: Mar. 14-18, San Diego, CA)
Department(s)Civil, Architectural and Environmental Engineering
Second DepartmentElectrical and Computer Engineering
Third DepartmentMaterials Science and Engineering
Keywords and Phrases
- Coaxial Cable Sensors,
- Reinforced Concrete (RC) Structures,
- Signal Loss
Document TypeArticle - Conference proceedings
Rights© 2004 SPIE -- The International Society for Optical Engineering, All rights reserved.
Citation InformationShishuang Sun, Genda Chen, David Pommerenke and James L. Drewniak. "Signal Loss, Spatial Resolution, and Sensitivity of Long Coaxial Crack Sensors" Proceedings Volume 5391, Smart Structures and Materials 2004: Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems (2004)
Available at: http://works.bepress.com/david-pommerenke/174/