An Acquisition Research into Radial Artery Tremor Signal Based on PVDF

Abstract

as a dynamic strain piezoelectric sensor, Piezoelectric polyvinylidene fluoride polymer film (PVDF) is ideal for physiological signal monitoring of human skin surface or implanted within the body. In this study, PVDF is used as a sensor and the design of signal acquisition and conditioning circuit is carried out according to the following ideas. Firstly, the circuit model of piezoelectric film is established on the basis of PVDF piezoelectric principle and piezoelectric characteristics. Secondly, according to the piezoelectric characteristics of PVDF, an automatic gain signal conditioning circuit is designed based on charge amplifier. Of which the passband range is less than 40Hz. Finally, a more convenient PVDF sensor structure will be proposed to achieve dynamic monitoring of radial artery tremor. The experimental results show that the piezoelectric signal conditioning circuit can filter out the signal clutter and power frequency noise well and maintain a stable high gain for a given frequency range.