ABSTRACT A kind of strain-sensing-based piezoelectric sensor was fabricated, and the mixture of cement powder and epoxy resin was used as the packaging layer. A nondestructive strain sensitivity testing method based on strain-sensing capability of piezoelectric sensor is presented. The theoretical foundation indicates that output voltage of piezoelectric sensor and strain of structure keep linear relationship when corresponding parameters are ascertained. Quasi-static responses and low-frequency (0–40 Hz) dynamic responses of piezoelectric sensors and strain gauges are analyzed. The results show that the piezoelectric sensors are sensitive and can accurately reflect the strain variation of structures. The quantification of output voltage and strain is investigated, and quasi-static and dynamic sensitivities were acquired (159.52–515.48 mV/με). With increasing of vibration frequency, the area of hysteresis loop decreases, and the strain sensitivity of sensor increases. Combining sensitivities with output voltages of sensors, the strain variation of structures could be obtained, which exhibit great application potentials of piezoelectric sensors for structural strain monitoring in low-frequency vibrations in civil engineering.

中文翻译：

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用于结构健康监测的压电传感器应变传感能力的无损评估

摘要 制作了一种基于应变传感的压电传感器，采用水泥粉和环氧树脂的混合物作为封装层。提出了一种基于压电传感器应变传感能力的无损应变灵敏度测试方法。理论基础表明，在确定相应参数后，压电传感器的输出电压与结构应变保持线性关系。分析了压电传感器和应变计的准静态响应和低频 (0–40 Hz) 动态响应。结果表明，压电传感器灵敏，能准确反映结构的应变变化。研究了输出电压和应变的量化，并获得了准静态和动态灵敏度 (159.52–515.48 mV/με)。随着振动频率的增加，磁滞回线的面积减小，传感器的应变灵敏度增加。将灵敏度与传感器的输出电压相结合，可以获得结构的应变变化，这显示了压电传感器在土木工程低频振动结构应变监测中的巨大应用潜力。