利用TDLAS技术的多点甲烷气体全量程监测

发布时间：2018-03-13 18:04

本文选题：甲烷(瓦斯)浓度　切入点：可调谐半导体激光吸收光谱技术　出处：《红外与激光工程》2017年09期 　论文类型：期刊论文

【摘要】：甲烷气体是一种对人体和环境有严重危害的气体,特别在煤矿、天然气罐、气站和石油化工等安全生产领域,对甲烷气体的泄漏监测至关重要。利用可调谐半导体激光吸收光谱技术(TDLAS),选择1 653.72 nm波长作为甲烷气体直接吸收检测的中心波长,使用微透镜设计了14 cm光程吸收池建立了一套浓度范围为0~100%全量程甲烷在线监测系统,利用分束器分成多路对不同位置进行监测,通过小波变换对吸收信号进行降噪处理,提高信噪比,使系统的最低测量极限达到335 ppm(1 ppm=10-6),并将自行研制的多点全量程激光甲烷传感器与商用红外甲烷气体探测器进行对比实验,结果表明:该系统具有测量稳定性好、测量范围大、响应速度快、免调校、测量探头本征安全、低成本等优点,完全有能力满足各行业的使用需求。
[Abstract]:Methane gas is a kind of gas that has serious harm to human body and environment, especially in the safe production fields such as coal mine, natural gas tank, gas station and petrochemical industry, etc. It is very important to monitor the leakage of methane gas. By using tunable semiconductor laser absorption spectroscopy, the wavelength of 1 653.72 nm is chosen as the central wavelength of direct absorption detection of methane gas. An on-line methane monitoring system with a concentration range of 0 ~ 100% has been established by using a microlens to design a 14 cm optical path absorption cell. The beam splitter is used to monitor different positions and the absorption signal is de-noised by wavelet transform. The signal-to-noise ratio (SNR) is improved, the minimum measuring limit of the system is up to 335 ppm(1 PPM 10-6, and the multi-point full-range laser methane sensor developed by ourselves is compared with the commercial infrared methane gas detector. The results show that the system has good measurement stability. It has the advantages of large range of measurement, fast response, no adjustment, intrinsic safety and low cost of measuring probe, and can meet the needs of various industries.
【作者单位】：中国科学院安徽光学精密机械研究所安徽省光子器件与材料重点实验室;中国科学技术大学环境科学与光电技术学院;中国科学院安徽光学精密机械研究所中国科学院环境光学与技术重点实验室;安徽中科智泰光电测控科技有限公司;
【基金】：国家自然科学基金(11204320,11204319,41405034) 国家科技支撑计划项目(2014BAC17B03) 中国科学院科研装备研制专项(YZ201315) 中国石油管道公司技术开发项目(20150206)
【分类号】：TN249

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