基于CO2浓度监测的飞机火警探测方法

目前飞机普遍采用感温、感烟火警探测方法,其存在误报率高的缺陷.分析了发生火灾时气态燃烧产物的生成规律,提出了以CO_2气体为火警探测参量,通过准确监测环境中CO_2气体浓度的变化,进行飞机火警探测的方法;根据飞机飞行所处环境条件的特殊性,研究了基于非色散红外(NDIR)吸收原理的CO_2气体浓度监测的飞机火警探测方法应用于飞机上所面临的温度补偿难题;根据飞机火警探测器测量电压与环境温度、参比电压之间的关系,采用偏最小二乘(PLS)法建立飞机火警探测器温度补偿模型;根据飞机火警探测器测量电压与CO_2气体浓度之间的关系,采用PLS法建立CO_2气体浓度计算模型;研究了基于CO_2气体浓度监测的报警算法,为飞机火警探测提供了一种新的方法.

Aircraft fire detection method based on CO2 concentration monitoring

High false alarm of heat detection and smoke detection used in aircraft is an existed question for aircraft fire detecting. The production rule of gaseous combustion products in fires was analyzed, and CO₂ was put forward as parameter of fire detection. Through accurate monitoring of CO₂ concentration in the environment, the aircraft fire detection was realized. Considering the particularity of environmental condition on aircraft, non-dispersion infrared (NDIR)was used to resolve the challenge of temperature compensation in aircraft fire detection. According to the relationship among the measured voltage of aircraft fire detector, environment temperature and reference voltage, temperature compensating model for aircraft fire detector was established based on partial least squares (PLS) approach. And model for CO₂ concentration calculating had built by using PLS method, which was based on correlation between measured voltage of aircraft fire detector and CO₂ concentration. With the calculated concentration of CO₂, an alarm algorithm for aircraft fire detector was presented then, which provided a new fire detection method for aircraft.