Design and experimental study of acceleration sensor based on PVDF piezoelectric film

摘要

PVDF piezoelectric film is a piezoelectric polymer material with excellent properties. In this paper, the research status of PVDF piezoelectric thin film was summarized, and the working principle of PVDF piezoelectric thin film accelerometer was introduced. On the basis of optimizing parameters, a cantilever PVDF piezoelectric film accelerometer and signal processing circuit were designed. The signal processing circuit which was composed of amplifier circuit and filter circuit was analyzed experimentally,and the frequency characteristic diagram of the filter circuit was obtained.The amplitude-frequency and phase-frequency characteristics of the filter circuit were better in a certain range,which can meet the design requirements.Experiments on the designed PVDF piezoelectric film accelerometer were carried out, including the calibration experiment of the PVDF accelerometer and the performance test of the sensor.The analysis results showed that the sensor has high sensitivity and good linearity, and can meet the measurement requirements.