光学精密工程2024，Vol.32Issue(24)：3537-3544,8.DOI:10.37188/OPE.20243224.3537
基于频率调制的煤矿高灵敏甲烷检测技术研究
Research on high sensitivity methane detection technology in coal mines based on frequency modulation
摘要
Abstract
To meet the needs of monitoring CH4 gas concentration in coal mines and gas fields,a frequen-cy modulated spectral system based on near-infrared distributed feedback lasers was built for rapid measure-ment of high concentration methane.The system obtained the optimal modulation frequency range and the optimal signal-to-noise ratio of the absorption component through simulation optimization and experimenta-tion.When the modulation frequency is 353 MHz,the power is 25.08 mW,and the effective optical path is 0.6 m,a CH4 absorption spectral line of 6 046.83 cm-1 is selected to achieve 1 Hz CH4 gas concentra-tion detection.The amplitude of the frequency modulation absorption component signal has a linear rela-tionship with concentration,with a linearity error of 2.88%and a linear fitting coefficient R2 of 0.997 4.For standard CH4 gas with a volume fraction of 2%,the relative error is less than 1.3‰.When the inte-gration time is 1 s,the Allen variance is 4.032 1 ppmv.When the integration time is 347 s,the Allen vari-ance is 0.222 8 ppmv,and the detection sensitivity is 2.28×10-7,which meets the measurement require-ments for high-speed and highly sensitive CH4 gas.The experimental results indicate that frequency modu-lation spectroscopy technology has broad application prospects in low detection limit and high sensitivity gas sensing.关键词
甲烷浓度检测/频率调制光谱/煤矿甲烷Key words
methane concentration detection/frequency modulation spectroscopy/coal mine methane分类
化学化工引用本文复制引用
李香格,胡迈,朱同宇,刘勇,贾良权..基于频率调制的煤矿高灵敏甲烷检测技术研究[J].光学精密工程,2024,32(24):3537-3544,8.基金项目
湖州市重点研发项目(No.2021ZD2003) （No.2021ZD2003）
浙江省公益项目(No.LGN22C190029,No.LGF22C160002) （No.LGN22C190029,No.LGF22C160002）
