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The calibration-free wavelength modulation absorption spectrum is studied based on the second harmonic (2f) signal to remove the calibration procedure for tunable diode laser absorption gas sensing. The simulated 2f signal is obtain from the analysis of peak and trough from measured 2f signal line shape. The gas concentration is calculated by the linear fitting of measured and simulated 2f signals. The experiment on CO2 detection is carried out at transition of 6336.24cm-1 in a 10 cm absorption cell. The results prove that the calibration-free wavelength modulation absorption spectrum is suited for on-site gas sensing at various conditions. The average absolute error of gas concentration is 0.67% at modulation index ranging from 1.8 to 3.2. With gas concentration and pressure varied, the average absolute errors of gas concentration are measured to be about 0.98% and 0.74%.
[1] Wang F, Huang Q X, Li N, Yan J H, Chi Y, Cen K F 2007 Acta Phys. Sin. 56 3867 (in Chinese)[王 飞、黄群星、李 宁、严建华、池 涌、岑可法 2007 物理学报 56 3867]
[2] 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]
[3] Kan R F, Dong F Z, Zhang Y J, Liu J G, Liu C, Wang M, Gao S H, Chen J 2005 Chin. Phys. 14 1904
[4] Cassidy D T, Reid J 1982 Appl. Opt. 21 1185
[5] Liu J T C, Jeffries J B, Hanson R K 2004 Appl. Phys. B 78 503
[6] Li H J, Rieker G B, Liu X, Jeffries J B, Hanson R K 2006 Appl. Opt. 45 1053
[7] Duffin K, McGettrick A J, Johnstone W, Stewart G, Moodie D G 2007 J. Lightwave Technol. 25 3114
[8] Li N, Yan J H, Wang F, Chi Y, Cen K F 2008 Chinese J. Lasers. 35 1567 (in Chinese)[李 宁、严建华、王 飞、池 涌、岑可法 2008 中国激光 35 1567]
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[1] Wang F, Huang Q X, Li N, Yan J H, Chi Y, Cen K F 2007 Acta Phys. Sin. 56 3867 (in Chinese)[王 飞、黄群星、李 宁、严建华、池 涌、岑可法 2007 物理学报 56 3867]
[2] 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]
[3] Kan R F, Dong F Z, Zhang Y J, Liu J G, Liu C, Wang M, Gao S H, Chen J 2005 Chin. Phys. 14 1904
[4] Cassidy D T, Reid J 1982 Appl. Opt. 21 1185
[5] Liu J T C, Jeffries J B, Hanson R K 2004 Appl. Phys. B 78 503
[6] Li H J, Rieker G B, Liu X, Jeffries J B, Hanson R K 2006 Appl. Opt. 45 1053
[7] Duffin K, McGettrick A J, Johnstone W, Stewart G, Moodie D G 2007 J. Lightwave Technol. 25 3114
[8] Li N, Yan J H, Wang F, Chi Y, Cen K F 2008 Chinese J. Lasers. 35 1567 (in Chinese)[李 宁、严建华、王 飞、池 涌、岑可法 2008 中国激光 35 1567]
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