烟雾浓度及粒径的激光探测实验研究

Experimental Study on the Laser Detection of Concentration and Particle Size of Smoke

烟雾是火灾的前兆和伴随产物 ,是火灾过程中的重要物理现象。烟雾浓度和平均粒径是烟雾的两个重要特性参数 ,是早期火灾探测的基础。本文对激光与烟雾相互作用进行了具体分析 ,提出了一种基于激光消光法和角散射法 ,同时探测烟雾的浓度和平均粒径的方法。本方法可用来进行早期火灾的探测报警 ,能克服传统的光电感烟探测技术存在的缺点 ,大大提高火灾探测的可靠性和灵敏度。

Smoke,which is the sign of fire and accompanied with fire,is an important physical phenomenon in fire process.The concentration and the mean particle size of smoke are of primary importance in early fire detection.The paper analyzed the interaction between laser and smoke,and put forward a method to detect simultaneously the concentration and the mean particle size of the smoke based on theory of the extinction and angular scattering of laser.This method can be used for early fire detection and alarm.Thus the disadvantage of traditional photoelectric smoke detection technique can be avoided.and the reliability and the sensitivity of fire detection are greatly enhanced.