宽带光声光谱技术在甲烷浓度探测中的应用
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摘要
利用宽带光源设计了用于探测甲烷浓度的光声光谱系统,在22Hz最佳调制频率下对甲烷浓度进行了探测,利用Allan方差分析了系统的稳定性,评估了系统的最低探测浓度。研究结果表明,系统对甲烷浓度(体积比)的探测极限能达到1×10-6。利用宽带光声光谱系统及基于分布反馈式二极管激光光源和长光程吸收池的直接吸收光谱探测系统同时对甲烷浓度进行探测,得到宽带光声光谱系统对甲烷浓度探测的误差约为8%。
A photoacoustic spectroscopy detection system based on a broadband light source is introduced,and the methane concentration is detected at the optimum modulation frequency of 22 Hz;further,the stability and the minimum detection concentration of the system are analyzed with Allan variance.The research results exhibit that the concentration(volume ratio)detection limit of methane can exceed 1 × 10-6.The methane concentration is detected by broadband photoacoustic system and direct absorption detection system based on distributed feedback diode laser source with a long path absorption cell simultaneously.The detected results show that the error of methane concentration detection by the broadband photoacoustic system is about 8%.
A photoacoustic spectroscopy detection system based on a broadband light source is introduced,and the methane concentration is detected at the optimum modulation frequency of 22 Hz;further,the stability and the minimum detection concentration of the system are analyzed with Allan variance.The research results exhibit that the concentration(volume ratio)detection limit of methane can exceed 1 × 10-6.The methane concentration is detected by broadband photoacoustic system and direct absorption detection system based on distributed feedback diode laser source with a long path absorption cell simultaneously.The detected results show that the error of methane concentration detection by the broadband photoacoustic system is about 8%.
引文
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[2]Cheng S Y,Gao M G,Xu L,et al.Remote sensing of seasonal variation in column concentration of atmospheric CO2and CH4in Hefei[J].Spectroscopy and Spectral Analysis,2014,34(3):587-591.程巳阳,高闽光,徐亮,等.合肥地区大气中CO2和CH4柱浓度季节变化遥测[J].光谱学与光谱分析,2014,34(3):587-591.
[3]Li Z Y,Tan R Q,Huang W,et al.Methane pressure detection based on Fourier transform infrared spectroscopy[J].Chinese Journal of Lasers,2017,44(3):0301006.李志永,谭荣清,黄伟,等.傅里叶变换红外光谱技术测量甲烷气压的实验研究[J].中国激光,2017,44(3):0301006.
[4]Wu T,Xu D,He X D,et al.Off-axis integrated cavity output spectroscopy technique based on wavelength modulation[J].Acta Optica Sinica,2017,37(8):0830002.吴涛,徐冬,何兴道,等.基于波长调制的离轴积分腔输出光谱技术[J].光学学报,2017,37(8):0830002.
[5]Zhang Z R,Xia H,Dong F Z,et al.Simultaneous and on-line detection of multiple gas concentration with tunable diode laser absorption spectroscopy[J].Optics and Precision Engineering,2013,21(11):2771-2777.张志荣,夏滑,董凤忠,等.利用可调谐半导体激光吸收光谱法同时在线监测多组分气体浓度[J].光学精密工程,2013,21(11):2771-2777.
[6]Li L,Yang Y G,Chen W L,et al.Correction of influence conditions in TDLAS ammonia measuring based on hollow waveguide cell[J].Opto-Electronic Engineering,2015,42(12):35-40.李龙,杨燕罡,陈文亮,等.基于HWG气体池的TDLAS氨气测量中影响条件的修正[J].光电工程,2015,42(12):35-40.
[7]Wang M M,Dai W G,Yang H N,et al.Leakage detection of vial based on tunable diode laser absorption spectroscopy[J].Laser&Optoelectronics Progress,2017,54(8):083004.王明明,戴伟国,杨荟楠,等.基于可调谐半导体激光吸收光谱技术的西林瓶检漏方法[J].激光与光电子学进展,2017,54(8):083004.
[8]Kalkman J,van Kesteren H W.Relaxation effects and high sensitivity photoacoustic detection of NO2with a blue laser diode[J].Applied Physics B,2008,90(2):197-200.
[9]Zhou Q,Tang C,Zhu S,et al.Detection of dissolved carbon monoxide in transformer oil using 1.567 m diode laser-based photoacoustic spectroscopy[J].Journal of Spectroscopy,2015(5):1-7.
[10]Thaler K M,Berger C,Leix C,et al.Photoacoustic spectroscopy for the quantification of N2O in the offgas of wastewater treatment plants[J].Analytical Chemistry,2017,89(6):3795-3801.
[11]Yun Y X,Chen W G,Sun C X,et al.Photoacoustic detection of methane dissolved in transformer oil[J].Proceedings of the CSEE,2008,28(34):40-46.云玉新,陈伟根,孙才新,等.变压器油中甲烷气体的光声光谱检测方法[J].中国电机工程学报,2008,28(34):40-46.
[12]Kosterev A A,Bakhirkin Y A,Curl R F,et al.Quartz-enhanced photoacoustic spectroscopy[J].Optics Letters,2002,27(21):1902-1904.
[13]Cumis M S,Viciani S,Borri S,et al.Widely-tunable mid-infrared fiber-coupled quartz-enhanced photoacoustic sensor for environmental monitoring[J].Optics Express,2014,22(23):28222-28231.
[14]Tian L,Lin C,Xu Z W,et al.Research on the fiber Fabry-Perot demodulation technique based on alloptical quartz enhanced photoacoustic spectroscopy system[J].Laser&Optoelectronics Progress,2014,51(6):060602.田莉,林成,许祖稳,等.全光式石英增强光声光谱系统光纤法珀解调技术研究[J].激光与光电子学进展,2014,51(6):060602.
[15]Zha S L.Transformer fault gas detection based on the broadband photo-acoustic spectroscopy[D].Hefei:University of Science and Technology of China,2017:18-38.查申龙.变压器故障气体宽带光声光谱技术研究[D].合肥:中国科学技术大学,2017:18-38.
[16]Dong L,Wu H P,Zheng H D,et al.Double acoustic microresonator quartz-enhanced photoacoustic spectroscopy[J].Optics Letters,2014,39(8):2479-2482.
[17]Liu K,Guo X Y,Yi H M,et al.Off-beam quartzenhanced photoacoustic spectroscopy[J].Optics Letters,2009,34(10):1594-1596.
[18]Miklós A.Acoustic aspects of photoacoustic signal generation and detection in gases[J].International Journal of Thermophysics,2015,36(9):2285-2317.
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