US Patent 11238716 Photoelectric smoke fire detection and alarming method, apparatus and system

The present invention relates to a new photoelectric smoke fire detection and alarming method, comprising: acquiring scattered light intensity data of at least two scattering angles of fire samples and interference source samples, and calculating sample parameters thereof to form a sample category table; and calculating sample parameters of detection data for comparison, and outputting a fire alarming signal when the comparison result is that the sample parameters are in line with the sample category table. According to the fire alarming method in the present invention, data collection, calculation and judgment are performed based on at least two modulated optical signals, so that the early-warning precision is improved.