《感测技术》课程教学课件（讲稿）第五章 电压型传感器

Q-d33C图5-2-7压电陶瓷的压电效应3 =(d31 +d32 +d33)T =(2d31 +d33)T = d,I

图5-2-7 压电陶瓷的压电效应 3 31 32 33 31 33 3  = + + = + = ( ) (2 ) d d d T d d T d T

5.2.3压电元件13 d.,lFd28图5-2-8双晶片悬臂梁式压电元件

5.2.3 压电元件 图5-2-8 双晶片悬臂梁式压电元件 2 31 2 3 8 d l Q F  =

CaQ=C,Ua（a）电荷等效电路（b）电压等效电路图5-2-9压电元件的等效电路

图5-2-9 压电元件的等效电路

C= nCC。=C/nQe= nQ0.=QU。=nUU.=UD图5-2-10压电元件的串并联

图5-2-10 压电元件的串并联 C nC e = Q nQ e = U U e = / C C n e = Q Q e = U nU e =

5.2.4接口电路R:2O牛图5-2-11压电传感器等效电路R,R,R=C= Ca+C。+C,I= joQR, + Ra

5.2.4 接口电路 C C C C = + + a c i a i i a R R R R R = + . . I j Q =  图5-2-11 压电传感器等效电路