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Proceedings Paper

A wireless multifunctional radar-based displacement sensor for structural health monitoring
Author(s): Jennifer A. Rice; Changzhi Li; Changzhan Gu; Justin C. Hernandez
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Paper Abstract

Wireless smart sensor technology offers many opportunities to advance infrastructure monitoring and maintenance by providing pertinent information regarding the condition of a structure at a lower cost and higher density than traditional monitoring approaches. Many civil structures, especially long-span bridges, have low fundamental response frequencies that are challenging to accurately measure with sensors that are suitable for integration with low-cost, low-profile, and power-constrained wireless sensor networks. Existing displacement sensing technology is either not practical for wireless sensor implementations, does not provide the necessary accuracy, or is simply too cost-prohibitive for dense sensor deployments. This paper presents the development and integration of an accurate, low-cost radar-based sensor for the enhancement of low-frequency vibration-based bridge monitoring and the measurement of static bridge deflections. The sensors utilize both a nonlinear vibrometer mode and an arctangent-demodulated interferometry mode to achieve sub-millimeter measurement accuracy for both periodic and non-periodic displacement. Experimental validation results are presented and discussed.

Paper Details

Date Published: 13 April 2011
PDF: 11 pages
Proc. SPIE 7981, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2011, 79810K (13 April 2011); doi: 10.1117/12.879243
Show Author Affiliations
Jennifer A. Rice, Texas Tech Univ. (United States)
Changzhi Li, Texas Tech Univ. (United States)
Changzhan Gu, Texas Tech Univ. (United States)
Justin C. Hernandez, Texas Tech Univ. (United States)


Published in SPIE Proceedings Vol. 7981:
Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2011
Masayoshi Tomizuka, Editor(s)

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