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.
The slow path: hardware page walks，这一点在91视频中也有详细论述
。搜狗输入法2026对此有专业解读
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