锂离子电池火灾烟雾不对称比研究

Study on asymmetry ratio of Li-ion battery fire smoke

为解决飞机货舱火灾探测器易受环境中粉尘等气溶胶影响而引起误报警的问题,提出一种基于多波长、多观测角的飞机货舱火灾探测方法,通过试验,得到锂离子电池火灾烟雾与ISO 12103-1 A1粉尘、ISO 12103-1 A2粉尘、Dolomite 90粉尘、细水雾等干扰气溶胶的不对称比(前后向散射信号的比值),利用不对称比的值,区分锂离子电池火灾烟雾与干扰气溶胶。结果表明:波长为405 nm时,能区分的锂离子电池火灾烟雾不对称比为7.25~10.54;波长为870 nm时,能区分的锂离子电池火灾烟雾不对称比为6.56~6.82。

In order to avoid false alarm in airplane cargos caused by dust and other aerosols in the air,a fire detection method based on multi-wavelength and multi-observation angle was proposed.Asymmetry ratio(ratio of forward to backward scattered signals)of Li-ion battery fire smoke and nuisance aerosols(ISO 12103-1 A1 dust,ISO 12103-1 A2 dust,Dolomite 90 dust,water mist)was obtained through experiments,and then used to distinguish the fire smoke and the aerosol.The results show that when the wavelength is 405 nm,the asymmetric ratio to distinguish the two is 7.25-10.54,which will be 6.56-6.82 for the wavelength of 870 nm.