Abstract:Tunable diode laser absorption spectroscopy (TDLAS) technique is a new method to detect trace gas qualitatively or quantificationally based on the scan characteristic of the diode laser to obtain the absorption spectra in the characteristic absorption region. TDLAS is a highly sensitive,highly selective and fast time response trace gas detection technique. In the present paper,a DFB laser at room temperature was used as the light source, wavelength modulation method was employed, and the second harmonic signal of one absorption line near 1.578 μm of carbon dioxide molecule was measured. A system was built for online monitoring of carbon dioxide concentration within the optical path of more than 700 meters at different heights. Combined with Alonzo Mourning-Obukhov length and characteristic velocity detected by large aperture scintillometer, the flux of carbon dioxide gas calculated by the experiential formula is within -60~60 mg·m-2·s-1. The comparison of the datea detected by TDLAS system and the eddy covariance showed that the change of the data detected by TDLAS had a similar trend to that detected by the eddy covariance, and the best results can be produced by this method, breakking through the phenomenon of only providing the flux of trace gases near the ground at present, and making the measurement of trace gas fluxes within a large area possible.
Key words:Tunable diode laser absorption spectroscopy;Carbon dioxide concentration;Flux of the carbon dioxide gas
宋雪梅,刘建国,张玉钧,陆亦怀,曾宗泳,何 莹,崔益本,田勇志,田 林 . 可调谐半导体激光吸收光谱遥测二氧化碳通量的研究[J]. 光谱学与光谱分析, 2011, 31(03): 803-807.
SONG Xue-mei, LIU Jian-guo, ZHANG Yu-jun, LU Yi-huai, ZENG Zong-yong, HE Ying,CUI Yi-ben, TIAN Yong-zhi, TIAN Lin . Study of Remote Sensing the Flux of Carbon Dioxide Gas with Tunable Diode Laser Absorption Spectroscopy. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2011, 31(03): 803-807.
[1] WANG Geng-chen(王庚辰). Climatic and Environmental Research(气候与环境研究),1997,2(3): 251. [2] Wang Tingyi, Ochs G R, Clifford S F. Journal of Optical Society of America, 1978, 68(3): 334. [3] Mallat S. A Wavelet Four of Signal processing. 2nd, ed. Beijing: China Machine Press, 2003. [4] Mallat S,Hwang W L. IEEE Tram on Information Theory,1992,38: 617. [5] Nelson D D, Zahniser M S. Appl. Phys., 1998, B(67): 433. [6] GAO Shan-hu,LIU Wen-qing,LIU Jian-guo,et al(高山虎,刘文清,刘建国,等). Chinese Journal of Quantum Electronics(量子电子学报),2006,23(3): 389. [7] ReId J, Labrie D. Appl. Phys.,1981,26: 203. [8] CHEN Dong, LIU Wen-qing,KAN Rui-feng,et al(陈 东,刘文清,阚瑞峰,等). Optical Technique(光学技术),2006,32(4): 599. [9] Reid J,Labric D. Appl. Phys, B,1981,26(2): 203. [10] CHEN Dong, LIU Wen-qing,ZHANG Yu-jun, et al(陈 东,刘文清,张玉钧,等). Chinese Journal of Lasers(中国激光),2006,33(11): 1553. [11] KAN Rui-feng,LIU Wen-qing,ZHANG Yu-jun, et al(阚瑞峰,刘文清,张玉钧,等). Acta Optica Sinica(光学学报),2006,26(1): 68. [12] WANG Xiao-mei, ZHANG Yu-jun, LIU Wen-qing, et al(王晓梅,张玉钧,刘文清,等). Optical Technique(光学技术),2006,32(5): 717. [13] ZENG Zong-yong,XIAO Feng-gang,LIU Jian-guo,et al(曾宗泳,肖锋刚,刘建国,等). Journal of Atmospheric and Environmental Optics(大气与环境光学学报),2009,4(1): 4. [14] Lavigne M B, Ryan M G, Anderson D E. Geophys. Res., 1997, 102: 28977.