At the same time , considering slow - varying character of fire signal , feedback cybernetic thought and holding time of fire signal is introduced into fire detecting three - layer structure realizing method in this paper . thus better reaches the aim of early warning and reducing mis - warning 同时又考虑了火灾信号的渐变特性，将控制论的反馈思想和火灾信号持续时间也引入到火灾探测算法上，更好地达到了提早报警和降低误报警的目的。
