Design and experimental research on preamplifier module for PVDF piezoelectric film sensors

PVDF is a polymer formed by the monomer partial fluorine ethylene CH
₂
= CF
₂
polymerization. It has good piezoelectric effect and is widely used in vibration measurement and other fields. In this paper, by analyzing the circuit model of PVDF piezoelectric thin film, the preamplifier module is designed, analyzed theoretically and tested. Testing results are consistent with theoretical ones. The flow field information of the circular tube was tested by the preamplifier module of the PVDF piezoelectric film sensors. Experimental results show that when measuring tube flow in low frequency region, PVDF piezoelectric film sensors are much better than accelerometer sensors. It can measure abundant low-frequency components, which provides a good experimental basis for analyzing the flow field in the tube.