Obscuration-forward scatter composite spot-type photoelectric smoke fire detector and detection method thereof
A Fire Detector, Forward Scattered Light Technology
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[0056] like figure 1 As shown, a light-reduction and forward-scattered light composite point-type photoelectric smoke detector includes a smoke-sensing labyrinth 4 composed of a labyrinth cover 2 and a labyrinth base 6. Inside the smoke-sensing labyrinth 4 A first infrared light-emitting tube 5, a second infrared light-emitting tube 7 and an infrared receiving tube 1 are provided; the angle ∠COA between the second infrared light-emitting tube 7 and the center 3 of the smoke-sensing labyrinth and the infrared receiving tube 1 is 132°, the angle ∠BOA between the first infrared light-emitting tube 5 and the center 3 of the smoke-sensing labyrinth and the infrared receiving tube 1 is 180°, and the first infrared light-emitting tube 5 and the second infrared light-emitting tube are 180°. 7 and the infrared receiving tube 1 are respectively connected with the control circuit.
[0057] The labyrinth cover 2 and the labyrinth base 6 adopt the conductivity of 10 8 S / cm conductive ABS...
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