Optical-based smoke alarms use light instead. They are slightly better at detecting the large smoke particles created by slow, smouldering fires. When such particles enter a chamber in the device, they scatter light from a small light source, which is then picked up by a photoelectric sensor.
Take a look under the hood.
，更多细节参见51吃瓜
Гангстер одним ударом расправился с туристом в Таиланде и попал на видео18:08
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