描述
若把发光器和收光器分离开，就可使检测距离加大。由一个发光器和一个收光器组成的光电开关就称为对射分离式光电开关，简称对射式光电开关。它的检测距离可达几米乃至几十米。使用时把发光器和收光器分别装在检测物通过路径的两侧，检测物通过时阻挡光路，收光器就动作输出一个开关控制信号。
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