传感器与自动检测技术演示教程第06章 压电式传感器
第6章压电式传感器第6章压电式传感器6.1压电效应及压电材料6.2压电式传感器测量电路6.3压电式传感器的应用第6章压电式传感器6.1压电效应及压电材料某些电介质,当沿着一定方向对其施力而使它变形时,内部就产生极化现象,同时在它的两个表面上便产生符号相反的电荷,当外力去掉后,又重新恢复到不带电状态。这种现象称压电效应。当作用力方向改变时,电荷的极性也随之改变。有时人们把这种机械能转换为电能的现象,称为“正压电效应”。相反,当在电介质极化方向施加电场,这些电介质也会产生几何变形,这种现象称为“逆压电效应”(电致伸缩效应)。具有压电效应的材料称为压电材料,压电材料能实现机—电能量的相互转换,如图...
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