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How Automatic Faucets Detect Hands
自动水龙头如何感应双手
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Automatic faucets use infrared sensors near the spout.自动水龙头在出水口附近使用红外传感器。
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The sensor sends out invisible light waves constantly.传感器持续发射不可见的光波。
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When your hand blocks those waves, it detects motion.当手挡住光波时，传感器即检测到动作。
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Then a small valve opens to let water flow.随后一个小阀门打开，让水流出来。
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No touching is needed—this saves water and germs.无需触碰——既节水又防细菌。
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The water stops automatically when your hand leaves.手离开后，水流自动停止。
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These faucets are common in airports and hospitals.这类水龙头常见于机场和医院。
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They work quietly and reliably every single time.它们每次运行都安静可靠。