Research on Particle Concentration Detection System Based on Laser Scattering Method

According to the characteristics of particulate matter in air environment, aiming at the defects of traditional sampling method, such as complex measurement process, heavy instrument and difficult on-line monitoring, this paper selects the light scattering method in non sampling method as the method of particulate matter concentration detection. According to the light scattering phenomenon and Mie scattering theory, in an ideal case, the light intensity of the scattered light is directly proportional to the mass concentration of particles, and the particle concentration can be calculated by algorithm. The particle concentration detection system is constructed by the data acquisition circuit, low-power sampling and holding circuit, control center circuit and power module.