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.
How to watch: The Secret Agent debuts on Hulu March 1.
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Фото: Willy Vanderperre / Harper's Bazaar France
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Marieke Pepers says she gets her best ideas while out walking her dog
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