摘要
基于火灾特征气体检测的火灾报警技术被认为是一种有着广阔前景的火灾早期探测手段,特别是利用光学吸收方法的火灾气体探测技术,除了能够提供高灵敏、低误报率的火灾报警外,还能够实现火灾的早期预警.提出了基于可调谐半导体激光吸收光谱技术的火灾气体高灵敏实时检测系统,采用光通信波段光纤耦合近红外分布反馈式(DFB)半导体激光器作为光源,利用两台激光器结合调制频率多路技术实现了火灾标志性气体CO,CO2的同时检测,对CO的最低检测限约为0.00375 mg/m3(3σ),能够满足火灾气体现场检测的需要.
Fire related gas sensing technology has been used to fire detection and has been regarded as a promising way for early fire warning, especially the optical absorption based gas-sensing. It can offer high sensitivity, low false alarm rates and early fire warning. A tunable diode laser absorption spectroscopy based fire gas detection system has been developed. The system used fiber-coupled near-infrared telecommunication distributed feedback （DFB） tunable diode laser as light source. Simultaneous detection of the two most common fire gas products, CO and CO2, was realized by modulation frequency multiplexed dual diode lasers. The system minimum detection limit for CO was estimated to be 0. 00375 mg/m^3 （3σ）, and can meet the demands of in situ measurements of fire related gases.
出处
《中国激光》
EI
CAS
CSCD
北大核心
2006年第11期1552-1556,共5页
Chinese Journal of Lasers
基金
国家自然科学基金(50534050)
国家863计划(2005AA641010)资助项目
