描述
最常用的交流响应加速度传感器是采用压电元件作为其敏感单元的。当有加速度输入时,传感器中的检测质量块“移动”使压电元件产生正比于输入加速度的电荷信号。从电学角看,压电元件如同一个有源的电容器,其内阻在10×9欧姆级别。由内阻和电容决定了RC时间常数,这也决定了传感器的高频通过特性。由于这个原因,压电加速度传感器不能用于测量静态事件。压电元件可来自于自然界或人造。它们有不同的信号转换效率和线性。市场上有两类压电加速度传感器-电荷输出型,电压输出型。
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