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How Fire Alarms Sense Smoke Particles
烟雾报警器如何感知烟雾微粒
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Most home alarms use photoelectric sensors inside a small chamber.大多数家用报警器在小型腔室内使用光电传感器。
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A tiny light beam shines across the chamber when no smoke is present.无烟时，一束微弱的光线穿过腔室。
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Smoke particles scatter the light when they enter the chamber.烟雾颗粒进入腔室后会散射光线。
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A sensor detects this scattered light and triggers the alarm.传感器探测到散射光，从而触发警报。
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The alarm sounds loudly to warn people quickly.警报声洪亮，可快速警示人员。
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It works best for smoldering fires like burning fabric.它对阴燃火（如织物燃烧）效果最佳。
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Batteries must be checked every month for safety.为确保安全，电池需每月检查一次。
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Clean dust from vents so sensors stay accurate.定期清理通风口灰尘，以保持传感器精度。