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Line width is the key parameter in tunable diode laser absorption spectroscopy (TDLAS); the dominant line widths are Doppler and collisional broadenings. Under low absorbance, the ratios of 2nd to 4th harmonics at the line center monotonously decrease and intersect at a fixed point, regardless of the changes in Doppler and collisional line widths. Based on this characteristic, a method is proposed which employs the ratios to measure the line width. To validate the reliability and accuracy of the proposed method, the transition of CO2 at 6982.0678 cm-1 is selected to measure the line width, the gas partial and total pressure. Experimental results show that the proposed method can achieve high precision in actual measurements.
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Keywords:
- tunable diode laser absorption spectroscopy (TDLAS) /
- wavelength modulation spectroscopy (WMS) /
- line width /
- partial pressure
[1] Sun K, Sur R, Chao X, Jeffries J B, Hanson R K, Pummill R J, Whitty K J 2013 Pro. Comb. Inst. 34 3593
[2] Geng H Liu J G Zhang Y J Kan R F, Xu Z Y Yao L Ruan J 2014 Acta Phys. Sin. 63 043301 (in Chinese) [耿辉, 刘建国, 张玉钧, 阚瑞峰, 许振宇, 姚路, 阮俊 2014 物理学报 63 043301]
[3] Jia J W, Zhang S F, Jin G Y, Yang L, Song R H, Wang H 2013 Chin. J. Vacuum Sci. Technol. 33 153
[4] 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]
[5] Lan L J, Ding Y J, Jia J W, Du Y J, Peng Z M 2014 Acta Phys. Sin. 63 083301 (in Chinese) [蓝丽娟, 丁艳军, 贾军伟, 杜艳君, 彭志敏 2014 物理学报 63 083301]
[6] Reid J, Labrie D 1981 Appl. Phys. B 26 203
[7] Rieker G B, Jeffries J B, Hanson R K 2009 Appl. Opt. 48 5546
[8] Farooq A, Jeffries J B, Hanson R K 2009 Appl. Phys. B 96 161
[9] Li N, Yan J H, Wang F, Chi Y, Cen K F 2008 Chin. 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]
[10] Stewart G, Johnstone W, Bain J R P, Ruxton K, Duffin K 2011 J. Lightw. Technol. 29 811
[11] Bain J R P, Johnstone W, Ruxton K, Stewart G, Lengden M, Duffin K 2011 J. Lightw. Technol. 29 987
[12] Duffin K, McGettrick A J, Johnstone W, Stewart G, Moodie D G 2007 J. Lightw. Technol. 25 3114
[13] Peng Z M, Ding Y J, Che L, Yang Q S 2012 Opt. Express 20 11976
[14] Liu Y Y, Lin J L, Huang G M, Guo Y Q, Duan C X 2001 J. Opt. Soc. Am. B 18 666
[15] Olivero J J, Longbothum R L, Quant J 1977 Spectrosc. Radiat. Transf. 17 233
[16] Che L, Ding Y J, Peng Z M, Li X H 2012 Chin. Phys. B 21 127803
[17] Lan L J, Ding Y J, Peng Z M, Du Y J, Liu Y F, Li Z 2014 Appl. Phys. B 117 543
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[1] Sun K, Sur R, Chao X, Jeffries J B, Hanson R K, Pummill R J, Whitty K J 2013 Pro. Comb. Inst. 34 3593
[2] Geng H Liu J G Zhang Y J Kan R F, Xu Z Y Yao L Ruan J 2014 Acta Phys. Sin. 63 043301 (in Chinese) [耿辉, 刘建国, 张玉钧, 阚瑞峰, 许振宇, 姚路, 阮俊 2014 物理学报 63 043301]
[3] Jia J W, Zhang S F, Jin G Y, Yang L, Song R H, Wang H 2013 Chin. J. Vacuum Sci. Technol. 33 153
[4] 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]
[5] Lan L J, Ding Y J, Jia J W, Du Y J, Peng Z M 2014 Acta Phys. Sin. 63 083301 (in Chinese) [蓝丽娟, 丁艳军, 贾军伟, 杜艳君, 彭志敏 2014 物理学报 63 083301]
[6] Reid J, Labrie D 1981 Appl. Phys. B 26 203
[7] Rieker G B, Jeffries J B, Hanson R K 2009 Appl. Opt. 48 5546
[8] Farooq A, Jeffries J B, Hanson R K 2009 Appl. Phys. B 96 161
[9] Li N, Yan J H, Wang F, Chi Y, Cen K F 2008 Chin. 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]
[10] Stewart G, Johnstone W, Bain J R P, Ruxton K, Duffin K 2011 J. Lightw. Technol. 29 811
[11] Bain J R P, Johnstone W, Ruxton K, Stewart G, Lengden M, Duffin K 2011 J. Lightw. Technol. 29 987
[12] Duffin K, McGettrick A J, Johnstone W, Stewart G, Moodie D G 2007 J. Lightw. Technol. 25 3114
[13] Peng Z M, Ding Y J, Che L, Yang Q S 2012 Opt. Express 20 11976
[14] Liu Y Y, Lin J L, Huang G M, Guo Y Q, Duan C X 2001 J. Opt. Soc. Am. B 18 666
[15] Olivero J J, Longbothum R L, Quant J 1977 Spectrosc. Radiat. Transf. 17 233
[16] Che L, Ding Y J, Peng Z M, Li X H 2012 Chin. Phys. B 21 127803
[17] Lan L J, Ding Y J, Peng Z M, Du Y J, Liu Y F, Li Z 2014 Appl. Phys. B 117 543
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