压电应变传感特性的理论分析与实验研究

Theoretical and experimental investigation on dynamic strain responses of piezoelectric sensors

提出了一种通过测量动态应变实现工程中低频振动监测的方法.在对动态应变压电传感特性进行理论分析的基础上,对压电传感元件在不同激振频率下(0.1～40.0 Hz)的动态响应进行了实验研究,实验给出了较好的测量精度.结果表明,压电传感元件灵敏度高、频响范围宽、响应时间快,符合工程中低频振动测量的要求.

A low- and medium-frequency measurement method is proposed for the dynamic strain measurement, in which dynamic strain responses are detected using piezoelectric sensors. On the basis of theoretical analysis, the dynamic responses of piezoelectric sensors are tested in an excitation frequency range spanning from 0.1 Hz to 40.0 Hz. Referring to experimental results, a high measurement precision has been obtained. Therefore, it is found that the piezoelectric sensor possesses such characteristics as high sensitivity, wide frequency response range and short response time, which can practically meet the demands of low- and medium-frequency vibration measurement.