自动水龙头生产时加入了使用红外光的运动传感器。光源和探测器以反射设置布置。当它检测到手或其他物体阻挡光路时，就会控制水龙头打开或关闭。它使用红外 LED 作为光源，并使用光 IC 或 CMOS 线阵图像传感器作为探测器。
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