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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Of those, 45 were upheld, including one of unwelcome physical contact and three of being in a state of undress. Most related to inappropriate sexual language and humour, and also culturally insensitive or racist comments.
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