1、SCHMERSAL電感式接近開關(guān)工作原理
電感式傳感器由三大部分組成：振蕩器、開關(guān)電路及放大輸出電路。振蕩器產(chǎn)生一個交變磁場。當(dāng)金屬目標(biāo)接近這一磁場，并達到感應(yīng)距離時，在金屬目標(biāo)內(nèi)產(chǎn)生渦流，從而導(dǎo)致振蕩衰減，以至停振。振蕩器振蕩及停振的變化被后級放大電路處理并轉(zhuǎn)換成開關(guān)信號，觸發(fā)驅(qū)動控制器件，從而達到非接觸式之檢測目的。
2、SCHMERSAL電容式接近開關(guān)的工作原理
電容式接近開關(guān)的感應(yīng)面由兩個同軸金屬電極構(gòu)成，很象“打開的"電容器電極，該兩個電極構(gòu)成一個電容，串接在RC振蕩回路內(nèi)。
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