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.
Москвичи пожаловались на зловонную квартиру-свалку с телами животных и тараканами18:04
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The real magic, our Secret Sauce #1, lies in how these border points are selected. Naive approaches quickly fail:
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