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    德國*SCHMERSAL光電式接近開關(guān)利用光電效應(yīng)做成的開關(guān)叫光電開關(guān)。將發(fā)光器件與光電器件按一定方向裝在同一個檢測頭內(nèi)。當(dāng)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(guān)內(nèi)設(shè)有振蕩器諧振電路，它是利用一個開放式的線圈產(chǎn)生定向高頻電磁（ RF ）場，穿透傳感器工作端面?zhèn)鞒鰜?。如果一個金屬目標(biāo)進(jìn)入這一區(qū)域，開關(guān)感應(yīng)產(chǎn)生的渦電流因此降低。感應(yīng)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(fù)載在振幅上產(chǎn)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(yīng)各種SCHMERSAL感應(yīng)傳感器，施邁賽磁性開關(guān)，施邁賽安全開關(guān)

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