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.
Владимир Зеленский. Фото: Thilo Schmuelgen / Reuters，推荐阅读WPS下载最新地址获取更多信息
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