德國*SCHMERSAL光電式接近開關利用光電效應做成的開關叫光電開關。將發光器件與光電器件按一定方向裝在同一個檢測頭內。當有反光面（被檢測物體）接近時，光電器件接收到反射光后便在信號輸出，由此便可“感知”有物體接近。 在SCHMERSAL接近開關內設有振蕩器諧振電路，它是利用一個開放式的線圈產生定向高頻電磁（ RF ）場，穿透傳感器工作端面傳出來。如果一個金屬目標進入這一區域，開關感應產生的渦電流因此降低。感應渦電流從 LC電路中吸收能量（L：線圈 C ：電容器） 。振蕩電路中的負載在振幅上產生一個衰減值，振蕩減弱。 上海維特銳直接從德國SCHMERSAL原廠家拿貨，直接供應各種SCHMERSAL感應傳感器，施邁賽磁性開關，施邁賽安全開關
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