Photoelectric smoke detectionsmoke detectionSmoke detectors are usually housed in plastic enclosures, typically shaped like a disk about 150 millimetres (6 in) in diameter and 25 millimetres (1 in) thick, but shape and size vary. Smoke can be detected either optically (photoelectric) or by physical process (ionization).https://en.wikipedia.org › wiki › Smoke_detectorSmoke detector – Wikipedia uses a steady beam of light. Once smoke particles enter the internal chamber of the device, the particles scatter the beam and redirect it to a photocell, which then triggers the alarm

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