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.
Фото: Владимир Чистяков / РИА Новости，推荐阅读safew官方版本下载获取更多信息
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