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CO is an indicative gas of coal spontaneous combustion warning and mine production safety instruction, whose detection process generally requires fiber long-haul transmission. However, currently, the communication fiber windows are mainly in the near-infrared band, so it is very significance to realize highly sensitive CO detection at near-infrared band. Tunable diode laser absorption spectroscopy (TDLAS) technology has advantages of high sensitivity, high resolution, fast response ability and no-contact, which has been widely used in air pollution monitoring, industrial and agricultural production process control, and many other fields. Long-path multi-pass cell can effectively improve the TDLAS detection capabilities, at the same time, the whole system is more compact. In this paper, 1566.64 nm DFB laser and the novel multi-pass cell with an optical path 56.7 m are used to detect different CO concentrations in long-term, while the system stability and linearity are analyzed. In addition, the detection limit is 0.25 ppmv with 30 s integration time by calculating the Allan variance. It means that we have primarily achieved highly sensitive detection of CO in the near-infrared bands.
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Keywords:
- tunable diode laser absorption spectroscopy (TDLAS) /
- multi-pass cell /
- CO detection /
- allan variance
[1] Wu Y G, Wu J M, Wang J F 2007 China Coal 33 40 (in Chinese) [吴玉国, 邬剑明, 王俊峰 2007 中国煤炭 33 40]
[2] Curl R F, Tittel F K 2002 Annu. Rep. Prog .Chem. Sect. C 98 219
[3] Li J Y, Du Z H, Ma Y W, X K X 2013 Chin. Phys. B 22 034203
[4] Che L, Ding Y J, Peng Z M, Li X H 2012 Chin. Phys. B 21 127803
[5] Kan R F, Liu W Q, Zhang Y J, Liu J G, Dong F Z, Gao S H, Wang M, Chen J 2005 Acta Phys. Sin. 54 1927 (in Chinese) [阚瑞峰, 刘文清, 张玉钧, 刘建国, 董凤忠, 高山虎, 王敏, 陈军 2005 物理学报 54 1927]
[6] Herriott D R, Schulte H J 1965 Appl. Opt. 4 883
[7] Lins B, Zinn P, Engelbrecht R, Schmauss B 2010 Appl. Phys. B 100 367
[8] Xia H, Dong F Z, Tu G J, Wu B, Zhang Z R, Wang Y 2010 Acta Optica Sinica 30 2596 (in Chinese) [夏滑, 董凤忠, 涂郭结, 吴边, 张志荣, 王煜 2010 光学学 30 2596]
[9] Tu G J, Wang Y, Dong F Z, Xia H, Pang T, Zhang Z R, Wu B 2012 Chin. Optics Lett. 10 042801
[10] Werle P, Mucke R, Slemr F 1993 Appl. Phys. B 57 131
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[1] Wu Y G, Wu J M, Wang J F 2007 China Coal 33 40 (in Chinese) [吴玉国, 邬剑明, 王俊峰 2007 中国煤炭 33 40]
[2] Curl R F, Tittel F K 2002 Annu. Rep. Prog .Chem. Sect. C 98 219
[3] Li J Y, Du Z H, Ma Y W, X K X 2013 Chin. Phys. B 22 034203
[4] Che L, Ding Y J, Peng Z M, Li X H 2012 Chin. Phys. B 21 127803
[5] Kan R F, Liu W Q, Zhang Y J, Liu J G, Dong F Z, Gao S H, Wang M, Chen J 2005 Acta Phys. Sin. 54 1927 (in Chinese) [阚瑞峰, 刘文清, 张玉钧, 刘建国, 董凤忠, 高山虎, 王敏, 陈军 2005 物理学报 54 1927]
[6] Herriott D R, Schulte H J 1965 Appl. Opt. 4 883
[7] Lins B, Zinn P, Engelbrecht R, Schmauss B 2010 Appl. Phys. B 100 367
[8] Xia H, Dong F Z, Tu G J, Wu B, Zhang Z R, Wang Y 2010 Acta Optica Sinica 30 2596 (in Chinese) [夏滑, 董凤忠, 涂郭结, 吴边, 张志荣, 王煜 2010 光学学 30 2596]
[9] Tu G J, Wang Y, Dong F Z, Xia H, Pang T, Zhang Z R, Wu B 2012 Chin. Optics Lett. 10 042801
[10] Werle P, Mucke R, Slemr F 1993 Appl. Phys. B 57 131
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