Chinese Optics Letters, 2007, 5 (1): 54, Published Online: Jan. 11, 2007
A high sensitivity spectrometer with tunable diode laser for ambient methane monitoring 
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测量 可调谐半导体激光吸收光谱 甲烷 多次反射池 300.6340 Spectroscopy, infrared 280.0280 Remote sensing and sensors 300.6260 Spectroscopy, diode lasers 300.6380 Spectroscopy, modulation
Abstract
Tunable diode laser absorption spectroscopy (TDLAS) has been widely employed in atmospheric trace gases detection. In the measurement of these trace gases, harmonic detection combined with a multi-pass white cell could remarkably enhance the detection sensitivity. In this paper, a portable TDLAS system built specifically for long time monitoring methane in the atmosphere is introduced. The detection limit is below 100 ppb that is enough for the monitoring of ambient methane, and the long time monitoring results obtained in Beijing are given, which is well coincident with that of the Fourier transform infrared (FTIR) spectroscopy.
Ruifeng Kan, Wenqing Liu, Yujun Zhang, Jianguo Liu, Min Wang, Dong Chen, Jiuying Chen, Yiben Cui. A high sensitivity spectrometer with tunable diode laser for ambient methane monitoring[J]. Chinese Optics Letters, 2007, 5(1): 54.
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