Murphy added: "As we look forward and anticipate customers' changing needs, we must ensure we continue to have the right setup and capabilities.
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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.
Producer: Kate White, Katie Tomsett, Clare Salisbury and Alex Mansfield
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