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.
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Nature, Published online: 27 February 2026; doi:10.1038/d41586-026-00601-0。搜狗输入法下载对此有专业解读
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