PVDF传感器动态压电特性的试验研究

EXPERIMENTAL STUDY ON DYNAMIC PIEZOELECTRICITY CHARACTERISTICS OF PVDF SENSOR

1.
Municipal Key Laboratory of Earthquake Engineering and Structural Retrofit,Beijing University of Technology Beijing 100022

摘要: 通过试验研究了国产PVDF应变传感器在0.1~30Hz频率范围内的压电特性,分析振动频率较低时,PVDF的应变与电荷放大器输出电压之间有相位差的原因。由幅频特性及相频特性曲线可以看出,较小的相位差对简谐振动测试信号影响不大,但对于随机信号,可能会造成波形畸变。所以要尽量选择低频特性好的电荷放大器与PVDF压电材料配套使用,以减小随机信号测量波形的畸变。
- PVDF传感器 /
- 压电材料 /
- 动态应变 /
- 桥梁监测
Abstract: The experiment study on piezoelectricity characteristics of the PVDF strain sensor between 0.1 Hz and 30 Hz is carried out and the reason why there is phase difference between PVDF strain and the output voltage of the charge amplifier within range of low frequencies is analyzed. It is observed from amplitude frequency characteristic and phase frequency characteristic that minor phase difference has little effects on the measured harmonic vibration signal but cause wave form distortion for random vibration signal. Hence within low frequency range the charge amplifier with good low frequency characteristic to match the applications of PVDF strain sensor to reduce the wave form distortion is suggested to use to measure random vibration signals.
- PVDF sensor /
- piezoelectricity material /
- dynamic strain /
- bridge monitoring