描述

最常用的交流響應加速度傳感器是采用壓電元件作為其敏感單元的。當有加速度輸入時，傳感器中的檢測質量塊“移動”使壓電元件產(chǎn)生正比于輸入加速度的電荷信號。從電學角看，壓電元件如同一個有源的電容器，其內阻在10×9歐姆級別。由內阻和電容決定了RC時間常數(shù)，這也決定了傳感器的高頻通過特性。由于這個原因，壓電加速度傳感器不能用于測量靜態(tài)事件。壓電元件可來自于自然界或人造。它們有不同的信號轉換效率和線性。市場上有兩類壓電加速度傳感器－電荷輸出型，電壓輸出型。

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