对于对射式光电传感器，在检测小的部件或进行精确定位时，其有效光束可能会太大以致不能进行可靠检测。在这种情况下，可以给传感器加装光缝来减小有效光束的尺寸。（注意：在选择光缝材料时，要注意有些非金属材料可能会被能的调制光穿透）。 安装光缝会减小通过镜头的光的能量（光缝越小，通过的光就越少）。例如：直径20mm的镜头安装上带一5mm孔的光缝后，则通过此孔的光的能量仅为原来的(1/4)2或1/16th，如果发射器和接收器都安装了光缝，则光的能量会损失双倍。 矩形光缝与同尺寸的圆孔形光缝相比，其镜头接收光的区域较大。因此，如果被测物通过光束的方向是一定的，则先选用矩形光缝（如边沿检测）。如果小的被测物通过光束的方向不是固定的，则先选用圆形光缝。

光电开关特点： 1：长寿命和可靠性。 2：红色LED显示可以检查传感器的状态。 3：经济并且简单的操作。 4：运用广泛，可替换小型开关和限位开关

光电开关（光电传感器）是光电接近开关的简称，它是利用被检测物对光束的遮挡或反射，由同步回路选通电路，从而检测物体有无的。物体不限于金属，所有能反射光线的物体均可被检测。光电开关将输入电流在发射器上转换为光信号射出，接收器再根据接收到的光线的强弱或有无对目标物体进行探测。安防系统中常见的光电开关烟雾报警器，工业中经常用它来记数机械臂的运动次数。

我厂各种电感式接近开关、电容式接近开关、光电开关、双向拉绳开关、两极跑偏开关、霍尔开关、磁性开关、倾斜开关、防爆磁性接近开关、接近开关防护外壳，电子计数器等系列；产品广泛适用于机床限位、检测、计数、测速、液面信号、自动流水线定位发讯号等多种控制，广泛使用于电梯、机械、矿山、冶金、塑料、纺织、化工、轻工、烟草、电力、铁路等部门。

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