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Proceedings Paper

A radar-based sensor network for bridge displacement measurements
Author(s): Jennifer A. Rice; Changzhan Gu; Changzhi Li; Shanyue Guan
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Paper Abstract

The development of effective structural health monitoring (SHM) strategies is critical as aging infrastructure remains a national concern with widespread impact on the quality of our daily lives. Wireless smart sensor networks (WSSNs) are an attractive alternative to traditional SHM systems for their lower deployment cost and their ability to enable new methods of distributed data processing. While acceleration has been the primary measurement utilized in most WSSN SHM applications, practically and accurately capturing structural deflections has been proven much more challenging. Displacement sensors produce reliable low-frequency measurements but are often difficult to implement in long-term field deployments. Conventional technologies for measuring deflection, both dynamic and static, are either too bulky or expensive to be integrated into WSSNs or lack sufficient accuracy. This paper presents the validation and characterization of a network of low-cost, wireless radar-based sensors for the enhancement of low-frequency vibrationbased bridge monitoring and the measurement of static bridge deflections. Experimental results utilizing a laboratoryscale truss bridge are presented and the performance of the wireless radar sensors is compared to conventional vibration and displacement transducers. In addition, challenges associated with detection distance, interference rejection and signal processing are discussed.

Paper Details

Date Published: 3 April 2012
PDF: 10 pages
Proc. SPIE 8345, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2012, 83450I (3 April 2012);
Show Author Affiliations
Jennifer A. Rice, Univ. of Florida (United States)
Changzhan Gu, Texas Tech Univ. (United States)
Changzhi Li, Texas Tech Univ. (United States)
Shanyue Guan, Univ. of Florida (United States)

Published in SPIE Proceedings Vol. 8345:
Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2012
Masayoshi Tomizuka; Chung-Bang Yun; Jerome P. Lynch, Editor(s)

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