STEM与日常科技·英语30篇（7）
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How Automatic Faucets Detect Your Hands
自动水龙头如何感应你的手
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Automatic faucets use infrared sensors to detect hand movement near the spout.
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When your hand interrupts the invisible infrared beam, the sensor triggers the water flow.
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These sensors work reliably because they respond to heat and motion simultaneously.
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The system shuts off water within half a second after hands leave the zone.
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This design saves water by preventing accidental or prolonged running.
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Unlike mechanical taps, infrared faucets require no physical contact to operate.
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They rely on simple electronics that convert light signals into electrical commands.
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Many public restrooms use this technology to improve hygiene and conserve resources.
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Battery-powered models last over two years before needing replacement.
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Engineers optimize the detection range so it works for children and adults alike.