A wireless multifunctional radar-based displacement sensor for structural health monitoring

Jennifer A. Rice; Changzhi Li; Changzhan Gu; Justin C. Hernandez

doi:10.1117/12.879243

13 April 2011 A wireless multifunctional radar-based displacement sensor for structural health monitoring

Jennifer A. Rice, Changzhi Li, Changzhan Gu, Justin C. Hernandez

Proceedings Volume 7981, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2011; 79810K (2011) https://doi.org/10.1117/12.879243
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2011, San Diego, California, United States

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.

Citation Download Citation

Jennifer A. Rice, Changzhi Li, Changzhan Gu, and Justin C. Hernandez "A wireless multifunctional radar-based displacement sensor for structural health monitoring", Proc. SPIE 7981, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2011, 79810K (13 April 2011); https://doi.org/10.1117/12.879243

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