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Sensors 2015, 15(4), 7412-7433; doi:10.3390/s150407412

A Noncontact FMCW Radar Sensor for Displacement Measurement in Structural Health Monitoring

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1,2,* , 3,4
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1
College of Optoelectronic Engineering, Chongqing University, Chongqing 400044, China
2
Key Laboratory for Optoelectronic Technology and Systems, Ministry of Education, Chongqing University, Chongqing 400044, China
3
School of Civil Engineering, Chongqing University, Chongqing 400045, China
4
Key Laboratory of New Technology for Construction of Cities in Mountain Area, Ministry of Education, Chongqing University, Chongqing 400045, China
*
Author to whom correspondence should be addressed.
Academic Editor: Thomas Schumacher
Received: 29 December 2014 / Revised: 9 March 2015 / Accepted: 13 March 2015 / Published: 26 March 2015
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Abstract

This paper investigates the Frequency Modulation Continuous Wave (FMCW) radar sensor for multi-target displacement measurement in Structural Health Monitoring (SHM). The principle of three-dimensional (3-D) displacement measurement of civil infrastructures is analyzed. The requirements of high-accuracy displacement and multi-target identification for the measuring sensors are discussed. The fundamental measuring principle of FMCW radar is presented with rigorous mathematical formulas, and further the multiple-target displacement measurement is analyzed and simulated. In addition, a FMCW radar prototype is designed and fabricated based on an off-the-shelf radar frontend and data acquisition (DAQ) card, and the displacement error induced by phase asynchronism is analyzed. The conducted outdoor experiments verify the feasibility of this sensing method applied to multi-target displacement measurement, and experimental results show that three targets located at different distances can be distinguished simultaneously with millimeter level accuracy. View Full-Text
Keywords: structural health monitoring; displacement; FMCW radar; multiple targets structural health monitoring; displacement; FMCW radar; multiple targets
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Li, C.; Chen, W.; Liu, G.; Yan, R.; Xu, H.; Qi, Y. A Noncontact FMCW Radar Sensor for Displacement Measurement in Structural Health Monitoring. Sensors 2015, 15, 7412-7433.

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