描述
槽型光电传感器把一个光发射器和一个接收器面对面地装在一个槽的两侧的是槽形光电。发光器能发出红外光或可见光，在无阻情况下光接收器能收到光。但当被检测物体从槽中通过时，光被遮挡，光电开关便动作。输出一个开关控制信号，切断或接通负载电流，从而完成一次控制动作。槽形开关的检测距离因为受整体结构的限制一般只有几厘米。
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