摘要
针对传统甲烷检测方法不稳定,寿命短和受环境影响大等问题,利用朗伯-比尔定律和激光光谱吸收的检测原理,设计了一种基于可调谐半导体吸收光谱（TDLAS）技术的激光甲烷浓度检测系统。通过检测激光透过甲烷气体前后强度的变化与其对应的甲烷气体浓度的关系,得到了甲烷气体浓度与二次谐波幅值的关系,经过相应的反演公式即可根据测量的二次谐波幅值得到甲烷气体的浓度。通过对整个系统进行实验,实验结果表明该系统可以实现长时间甲烷浓度的稳定测量,精度可达0.0001mg/m^3,同时本系统可以有效避免其他气体对甲烷气体浓度检测的干扰。该成果可应用于煤矿,油矿等矿洞中甲烷气体浓度的检测等。
A laser methane concentration detection system based on TDLAS technology was designed based on the detection principle of Lambert-Beer′s law and laser spectrum absorption,which was aimed at solving the issues of traditional methane detection method were unstable,short life and environmental impact.The relationship between the concentration of methane gas and the second harmonic amplitude was obtained by detecting the relationship between the change of the intensity of the laser gas before and after the passage of methane and its corresponding methane gas concentration.After the corresponding inversion formula,the concentration of methane gas could be obtained according to the measured second harmonic amplitude of methane gas concentration.Through the test of the whole system,the experimental results showed that the system can achieve a stable measurement of methane gas concentration for a long time,the accuracy of up to 0.000 1 mg/m^3,while the system can effectively avoid other gases on the methane gas concentration detection interference.The results can be applied to coal mines,oil mines and other methane in the detection of methane concentration.
作者
段尚汝
谈曾巧
王琦
高敏杰
卜雄洙
Duan Shangru;Tan Zengqiao;Wang Qi;Gao Minjie;Bu Xiongzhu(School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China)
出处
《电子测量技术》
2018年第1期101-104,共4页
Electronic Measurement Technology
基金
南京理工大学本科生科研训练‘百千万’计划项目资助
关键词
可调谐半导体吸收光谱
波长调制频谱
甲烷
tunable diode laser absorption spectroscopy
wavelength modulation spectroscopy
methane
