1、SCHMERSAL電感式接近開關工作原理
電感式傳感器由三大部分組成：振蕩器、開關電路及放大輸出電路。振蕩器產生一個交變磁場。當金屬目標接近這一磁場，并達到感應距離時，在金屬目標內產生渦流，從而導致振蕩衰減，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換成開關信號，觸發驅動控制器件，從而達到非接觸式之檢測目的。
2、SCHMERSAL電容式接近開關的工作原理
電容式接近開關的感應面由兩個同軸金屬電極構成，很象“打開的"電容器電極，該兩個電極構成一個電容，串接在RC振蕩回路內。
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