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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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久安厅内的屏幕上滚动播放着何晴的照片，厅内四周摆满了亲友的花圈，其中包括六小龄童、唐国强、翁虹、尤勇智等何晴圈内好友送来的花圈，还有《三国演义》剧组送来的花圈。人群中不时传来一阵抽泣。