8 April 2008 Concrete structure monitoring based on built-in piezoelectric ceramic transducers
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Piezoelectric ceramic transducers were made and embedded in concrete structures in this paper in order to monitor cracks under static load. In the experiment, the component was made in concrete with rebars. The transducers were used as sensors according to the direct piezoelectric effect and actuators according to the indirect piezoelectric effect. During the experiment, sine pulse signals are applied on the transducer to generate elastic wave to scan the area between the transducers. As being electronic device, signal of piezoelectric material will be disturbed by electromagnetic wave in environment. Wavelet analysis with its good ability both in time and frequency domain was adopted in filtering the interfering signal. Then damage index was established based on continuous wavelet analysis. From the change of the damage index, the information of crack occurring and developing in the concrete component has been acquired. And the trend of the damage index also has a good correlation with that of the strain gauges used in the experiment. The results have shown that this method has the advantages that do not require sensors placed on the point of damage occurring and can protect sensors from damage. Thus it can be used in the monitoring of civil structure.
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Xiaoyan Zhao, Xiaoyan Zhao, Hongnan Li, Hongnan Li, De Du, De Du, Jinglong Wang, Jinglong Wang, } "Concrete structure monitoring based on built-in piezoelectric ceramic transducers", Proc. SPIE 6932, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2008, 693208 (8 April 2008); doi: 10.1117/12.775651; https://doi.org/10.1117/12.775651

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