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气体吸收谱线的线宽主要包括碰撞作用引起的洛伦兹线宽和分子热运动引起的高斯线宽, 是可调谐二极管激光吸收光谱技术(TDLAS)的重要参数. 本项研究在弱吸收条件下, 通过对波长调制法中二次与四次谐波峰值比进行理论分析和仿真计算, 发现无论洛伦兹和高斯线宽如何变化, 二次和四次谐波峰值比具有恒过不动点的特征. 本文基于该不动点提出了一种线宽在线测量的方法, 并以CO2分子6982.0678 cm-1 吸收谱线为例进行实验验证. 实验结果表明, 该方法可以精确测量线宽, 进而根据测量得到的线宽确定气体分压和总压, 可有效地提高TDLAS技术在工业现场中的测量精度.
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关键词:
- 可调谐二极管激光吸收光谱(TDLAS) /
- 波长调制光谱(WMS) /
- 线宽 /
- 气体分压
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.-
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 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 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 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 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 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 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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