1-3型水泥基压电复合材料传感器的性能

Properties of 1-3 cement based piezoelectric composite sensor

以1-3型水泥基压电复合材料作为传感元件制备了水泥基压电复合材料传感器。研究了水泥基压电复合材料传感器的频率响应、线性性能以及应用于混凝土后的传感性能。结果表明:当加载频率小于5 Hz时,所有载荷下传感器输出电压的幅值均增大,但当加载频率大于5 Hz时,所有载荷下传感器输出电压的幅值几乎与输入载荷频率无关;传感器的输出电压幅值和输入载荷幅值之间存在明显的线性关系。水泥基压电传感器在实际混凝土结构中具有良好的传感特性,其输出电压与复杂载荷、随机载荷和脉冲载荷均呈现明显的一一对应关系,且与输入载荷基本同步,不存在滞后现象,试验输出电压值与理论输出电压值也非常吻合。该传感器非常适合于土木工程结构的健康监测。

A cement based piezoelectric composite sensor was fabricated using the 1-3 cement based piezoelectric composite as a sensing element. The frequency response, linearity and sensing properties of the sensor were investigated. The results indicate that the output voltage amplitude of the sensor increase with increasing frequency of load under 5 Hz. When the frequency of load is larger than about 5 Hz, the output voltage amplitude of the sensor is nearly independent of frequency. There exists an obviously linear relationship between the output voltage amplitude and input load amplitude of the sensor. The 1-3 cement based piezoelectric composite sensor embedded into the concrete structure exhibits excellent sensing properties. The output voltages of the sensor are correspondent to the complex load, random load and pulse load very well. The phase difference between the output voltage and input load is near zero. The experimental output voltage value of the sensor is in good agreement with the theoretical value. Such sensor has a good potential to be used in civil engineering structural health monitoring.