摘要
针对煤矿井下环境中的瓦斯气体,根据瓦斯气体分子在一定的波段对光有吸收特性,使光谱具有了瓦斯的特性,通过对煤矿瓦斯气体吸收光谱的分析,提出了一种光纤传感瓦斯气体及其系统。该系统以分布反馈式LD作为光源,采用InGaAs PIN作为光电探测器,通过理论分析得到二次谐波信号与气体的浓度和初始光强有关,因此检测二次谐波信号就可以获得气体浓度信息。实验表明该系统具有很高的灵敏度,传感系统的灵敏度达到10×10-6,精确度和稳定性等性能均可满足煤矿瓦斯气体检测要求。
To the gas in coal mine underground environment, based on the optical absorption character of gas molecule in definite spec- tram range, through the analysis of coal mine gas absorption spectrum, optical fiber sensing gas and system is suggested. The system＇s light -source is distributed feedback LD,and itg photo- detector is InGaAs PIN. Through theory analysis, we know that the secondharmonic signal relates to gas density and initial light intensity, and the gas density information can be achieved by the second -har- monic signal detection. The system has high sensitivity （10 × 10^-6） ,and it＇s accuracy, stability can meet the requirement of coal mine gas detection.
出处
《煤矿安全》
CAS
北大核心
2007年第8期6-9,共4页
Safety in Coal Mines
基金
国家自然科学基金项目(50574005)
安徽省教育厅自然科学基金项目(2005KJ081)
关键词
光纤传感
光谱吸收
煤矿瓦斯
二次谐波
optical fiber
spectrum absorption
coal mine gas
second -harmonic
