STEM与日常科技·英语30篇（7）

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自动水龙头如何感应你的手

Automatic faucets use infrared sensors to detect hand movement near the spout.
When your hand interrupts the invisible infrared beam, the sensor triggers the water flow.
These sensors work reliably because they respond to heat and motion simultaneously.
The system shuts off water within half a second after hands leave the zone.
This design saves water by preventing accidental or prolonged running.
Unlike mechanical taps, infrared faucets require no physical contact to operate.
They rely on simple electronics that convert light signals into electrical commands.
Many public restrooms use this technology to improve hygiene and conserve resources.
Battery-powered models last over two years before needing replacement.
Engineers optimize the detection range so it works for children and adults alike.