一种新型测脉电容传感器的设计与仿真

Design and simulation of a new type of pulse capacitance sensor

该课题研究由浙江省大学生科研创新团队资助,该文介绍了一种全新的差动电容式脉象传感器。三块平行放置的金属极板组成两个电容器,一个用做测量脉搏跳动的检测电容,另一个则作为参考电容。测量电容的金属极板随着人体脉搏的跳动而上下浮动,从而改变了两个极板间的距离,使测量电容的值发生周期性变化。通过CAV424芯片,将参考电容的值与测量电容的值做差分运算和放大运算,输出一个大小随差分信号变化的电压信号。AD采集此电压信号,即为数字化后的人体脉搏信号。

This paper introduces a new kind of differential capacitive pulse sensor.Three pieces of parallelize metal plate consisting of two capacitor,one is used for measuring the pulse detection capacitance,the other is taken as a reference capacitance.The metal plate of detection capacitance is along with the human pulse beat floating up and down,so as to change the distance between two plates,making the measuring capacitance value changes occurred periodically.Through the CAV424,the reference capacitance value and the measuring capacitance value do difference operation and amplification operation,output a voltage signal whose size is changing with the differential signal.AD collected the voltage signal,which is the human pulse signal after being digital.