摘要
以中心波长为1 650 nm的激光光源作为探测光源,并结合波长调制光谱以及谐波探测技术,设计了一套基于TDLAS(可调谐二极管激光吸收光谱)技术的CH4气体浓度探测系统。结合长光程测量池,以浓度为99.999%的高纯N2为背景气体,对8种浓度的CH4气体进行了测量,利用配置的101×10?6 CH4气体对系统进行了稳定性测量,并利用软件对天然气管道单点泄漏时的CH4浓度分布进行了模拟。实验验证了系统对CH4能够很好响应并且具有较好的线性关系,系统长时间运行稳定可靠,可以用于对煤矿、天然气站等场所进行现场检测。
A methane concentration monitoring system based on tunable diode laser absorption spectroscopy is de-signed,which takes semiconductor diode laser with center wavelength of 1 650 nm as light source,and combines wave-length modulation spectroscopy and harmonic detection technology.TDLAS is a gas detection technique with high sensi-tivity,high selectivity and rapid responsibility.Measured 8 kinds of concentrations of CH4 gas by combining long-path measurement cell with high-purity N2（99.999%）which as background gas.The stability of system is tested by measuring 101 ppm of methane.Simulated concentration distribution of CH4 gas of natural gas pipeline with a single point of leakage.The experiments showed that the detection system can respond well to the CH4 and have a good linear relation,and it can be used for field detection of coal mine and gas station for its long-term stability.
出处
《电子测量与仪器学报》
CSCD
2011年第3期265-271,共7页
Journal of Electronic Measurement and Instrumentation
基金
安徽省青年教师(编号:2008jq1184)资助项目
安徽省自然科学基金项目(编号:KJ2008B047)资助项目
