1.653μm处甲烷分子谐波探测技术研究
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摘要
谐波探测被广泛应用于激光光谱技术中,利用它可以提高探测灵敏度。利用1.653μm的分布反馈式(DFB)二极管激光器作为光源,建立了一套可调谐半导体激光吸收光谱(TDLAS)甲烷探测装置。该装置利用由2块圆形柱面镜构成的光学多通池增加吸收光程,提高探测灵敏度。吸收池基长为15cm,在112次反射情况下,有效吸收光程达到16.8m,实现甲烷0.60×10-6(2s采样时间)的探测极限,可应用于实际大气甲烷的痕量探测。
Harmonic detection is widely used in laser spectroscopy,which can improve detection sensitivity.In this paper,a set of tunable diode laser absorption spectroscopy(TDLAS)methane detection device is established by using 1.653μm distributed feedback(DFB)diode laser as light source.The device utilizes two circular cylindrical mirror composed of optical multi-cell to increase absorption of optical path and improve detection sensitivity.Absorption length of multi-pass optical cell is 15 cm,and effective absorption path length is 16.8min 112 reflex cases,and detection limit of methane 0.60×10~(-6)(2ssampling time)is realized,which can be applied to trace detection of actual atmospheric methane.
Harmonic detection is widely used in laser spectroscopy,which can improve detection sensitivity.In this paper,a set of tunable diode laser absorption spectroscopy(TDLAS)methane detection device is established by using 1.653μm distributed feedback(DFB)diode laser as light source.The device utilizes two circular cylindrical mirror composed of optical multi-cell to increase absorption of optical path and improve detection sensitivity.Absorption length of multi-pass optical cell is 15 cm,and effective absorption path length is 16.8min 112 reflex cases,and detection limit of methane 0.60×10~(-6)(2ssampling time)is realized,which can be applied to trace detection of actual atmospheric methane.
引文
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[10]Li Ning.Research on gas detection and 2Ddistribution reconstruction by tunable diode laser absorption spectroscopy technique[D].Hangzhou:University of Zhejiang,2008.李宁.基于可调谐激光吸收光谱技术的气体在线检测及二维分布重建研究[D].杭州:浙江大学,2008.
[11]Doussin J F,Dominique R,Patrick C.Multiple-pass cell for very-long-path infrared spectrometry[J].Applied Optics,1999,38(19):4145-4150.
[2]Rella R,Siciliano P,VasanelliL J,et al.Physical properties of osmium doped tin oxide thin films[J].J.Appl.Phys.,1998,83(4):2369.
[3]Schafer S,Mashni M,Sneider J,et al.Sensitive detection of methane with a 1.65μm diode laser by photoacoustic and absorption spectroscopy[J].Applied Physics B:Lasers and Optics,1998,66(4):511-516.
[4]Kan Ruifeng,Liu Wenqing,Zhang Yujun,et al.Absorption measurements of ambient methane with tunable diode laser[J].Acta Physica Sinica,2005,54(4):1927-1930.阚瑞峰,刘文清,张玉钧,等.可调谐二极管激光吸收光谱法测量环境空气中的甲烷含量[J].物理学报,2005,54(4):1927-1930.
[5]He Ying,Zhang Yujun,Kan Ruifeng,et al.The development of acetylene on-line monitoring technology based on laser absorption spectrum[J].Spectroscopy and Spectral Analysis,2008,28(10):2228-2231.何莹,张玉钧,阚瑞峰,等.基于激光吸收光谱乙炔在线监测技术的研究[J].光谱学与光谱分析,2008,28(10):2228-2231.
[6]Dyroff C,Zahn A,Sanati S,et al.Tunable diode laser in-situ CH4 measurements aboard the CARIBIC passenger aircraft:instrument performance assessment[J].Atmospheric Measurement Techniques,2014,7(3):743-755.
[7]Dong L,Li C,Yu Y,et al.Compact TDLAS based sensors using interband cascade lasers for CH2O and CH4trace gas measurements[C]//Optics and Photonics for Energy and the Environment.USA:Optical Society of America,2015.
[8]Chen Jiajin,Zhao Weixiong,Gao Xiaoming,et al.Optical multipass cell based on two cylindrical mirrors for high sensitivity detection of methane[J].Acta Optica Sinica,2015,35(9):345-350.陈家金,赵卫雄,高晓明,等.基于柱面镜光学多通池的CH4高灵敏度探测[J].光学学报,2015,35(9):345-350.
[9]Lang N,Macherius U,Wiese M,et al.Sensitive CH4detection applying quantum cascade laser based optical feedback cavity-enhanced absorption spectroscopy[J].Optics Express,2016,24(6):A536-A543.
[10]Li Ning.Research on gas detection and 2Ddistribution reconstruction by tunable diode laser absorption spectroscopy technique[D].Hangzhou:University of Zhejiang,2008.李宁.基于可调谐激光吸收光谱技术的气体在线检测及二维分布重建研究[D].杭州:浙江大学,2008.
[11]Doussin J F,Dominique R,Patrick C.Multiple-pass cell for very-long-path infrared spectrometry[J].Applied Optics,1999,38(19):4145-4150.