原位直测式管道激光甲烷浓度检测仪设计  

Design of an In-situ Direct Measuring Pipeline Laser Methane Concentration Detector

作　　者：王尧 WANG Yao(China Coal Technology and Engineering Group Chongqing Research Institute,Chongqing 400039,China;State Key Laboratory of the Gas Disaster Detecting,Preventing and Emergency Controlling.Chongqing 400037,China)

机构地区：[1]中煤科工集团重庆研究院有限公司,重庆400039 [2]瓦斯灾害监控与应急技术国家重点实验室,重庆400037

出　　处：《自动化与仪器仪表》2025年第3期103-106,共4页Automation & Instrumentation

基　　金：中国煤炭科工集团有限公司科技创新重点项目(2022-TD-ZD001);中煤科工集团重庆研究院有限公司创新引导项目(2022YBXM06)。

摘　　要：为实现实时快速激光检测甲烷气体浓度,解决传统基于泵吸式或差压式采样的“抽取法”瓦斯管道甲烷浓度测量存在的缺陷,并保证检测仪对测量灵敏度的性能要求,通过研究不同光程长度对不同浓度甲烷气体对应的测量灵敏度的影响,得出光程长度设定在50 mm左右能最大限度满足检测仪对测量灵敏度的性能要求,并配套低功耗设计的处理电路进行浓度解调开发了基于TDLAS技术的原位直测式激光甲烷浓度检测仪。试验表明,该检测仪在0%~10%浓度范围内的测量基本误差小于±0.05%CH_(4),在10%~100%浓度范围内的测量相对误差小于真值的±5%。In order to quickly detect methane gas in real time,solve the defects of the traditional "extraction method" methane concentration measurement of gas pipeline based on pump suction or differential pressure sampling,and ensure the tester's performance requirements for measurement sensitivity,an in-situ direct measuring pipeline laser methane concentration detector,based on TDLAS technology,has been developed.By studying effect of different chamber length on the measurement sensitivity of different concentrations of methane gas,the gas chamber with length about 50 mm can meet the performance requirements as much as possible,and the detector combine with the processing circuit designed with low power consumption for concentration demodulation.Test has shown that the measurement basic error in the range of 0%~10% is less than ±0.05%CH_4,and the measurement relative error is less than ±5% of the true value in the range of 10%~100%.

关 键 词：激光 谐波检测 原位直测 响应 甲烷 

分 类 号：TD676[矿业工程—矿山机电]