fire smoke identification, sauter mean particle size, scattered light power, photoelectric smoke detectors, fire characterization parameters, infrared light, blue light, Motor vehicles. Aeronautics. Astronautics, TL1-4050

At present, the civilian aircraft cargo hold is mainly used photoelectric smoke detector as a fire smoke identification, due to the other interference particles（dust, or water vapor, etc）will be suspended in the aircraft cargo hold, which will trigger the fire detector alarm, there is a high false alarm rate problem. Based on the dual-wavelength photoelectric smoke detector can effectively reduce the problem of high false alarm rate, the collection of aircraft cargo hold typical combustibles as well as interference sources of infrared light scattering power, blue light scattering power as a fire parameter, through the particulate matter of infrared light scattering power and blue light scattering power analysis, as well as a collection of the Sauter mean particle size analysis for the subsequent development of composite smoke detector optimization of the fire parameter. Results show that the infrared and blue light have a good effect on the fire smoke particles, and a better response to fire smoke particles. Combined with the Sauter mean particle size, which can effectively distinguish between fire smoke particles and non-fire smoke particles, reduce the false alarm rate. The false alarm rate of the interference source does not exceed 6.7%.