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NO, NO2是大气污染源中的常见气体, 对环境具有严重的危害性. 为检测污染源中这两种气体的浓度, 构建了成本较低的基于红外热辐射光源的光声光谱气体检测系统. 分析计算得到了NO, NO2 在2500–6667 nm波段吸收谱线. 通过建立光声传输线RLC振荡电路模型和仿真得到品质因数、声压大小与谐振腔长、内腔半径以及调制频率的关系, 据此设计了光声池几何结构. 实验表明该系统所测得的光声信号与气体浓度有很好的线性关系, 并且对NO, NO2气体极限检测灵敏度分别达到4.01 和1.07 μL. 通过调节激光发射波长和选取滤波片, 该系统还可用于其他微量气体的浓度检测.NO and NO2 are the common gases and have serious harmfulness to the atmosphere pollution of environment. To detect the concentration of the two gases in pollution, we construct a low cost photoacoustic spectrum gas measurement system based on the thermal radiation light source. Absorption lines of the NO and NO2 between 2500 and 6667 nm are calculated. By modeling the photoacoustic transmission line the relations between quality factor, acoustic pressure and cavity length, cavity radius, modulation frequency are obtained, and the design of geometric construction of photoacoustic cell is also guided. The experiment show that there exists a good linearity between photoacoutic signal detected in the system and gas concentration, and the system ultimate detection sensitivities to the NO and NO2 are 4.01 and 1.07 μL/L respectively. When the emission wavelength of laser is regulated suitably and the edmund optics is chosen reasonably, this system is also suitable for the concentration-detection of other trace gas.
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Keywords:
- atmospheric pollution /
- photoacoustic spectroscopy /
- gas measurement
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[2] Zan H W, Li C H 2011 Appl. Phys. Lett. 98 253503
[3] Hwang B W, Lee S C 2012 14th International Meeting on Chemical Sensors Nuremberg, Germany, May 20-23, 2012 p1617
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[11] Yuan C Y, Yan Z X, Meng G, Li Z H, Shang L P 2010 Acta Phys. Sin. 59 6908 (in Chinese) [袁长迎, 炎正馨, 蒙瑰, 李智慧, 尚丽平 2010 59 6908]
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[13] Chen W G, Zhou H Y, Huang H X, Tang J 2010 Chin. J. Sci. Instrum. 31 665 (in Chinese) [陈伟根, 周恒逸, 黄会贤, 唐炬 2010 仪器仪表学报 31 665]
[14] Wu H P, Dong L, Zheng H D, Liu Y Y, Ma W G 2012 Acta Phys. Sin. 62 070701 (in Chinese) [武红鹏, 董磊, 郑华丹, 刘妍妍, 马维光 2012 62 070701]
[15] Li J S, Gao X M, Fang L 2007 Opt. Laser Technol. 39 1144
[16] Rothman L S, Jacquemart D, Barbe A 2005 J. Quant. Spectrosc. Radiat. Transfer 96 139
[17] Diebold G J 2003 Rev. Sci. Instrum. 74 801
[18] Bernegger S, Sigrist M W 1990 Rev. Infrared Phys. 30 375
[19] Bijnen F G C, Reuss J, Harren F J M 1996 Rev. Sci. Instrum. 67 2914
[20] Li L D 2011 J. Liaoning Tech University (Nat. Sci) 30 202 (in Chinese) [李丽丹 2011 辽宁工程技术大学学报(自然科学版) 30 202]
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[1] Jeong H Y, Lee D S 2010 Appl. Phys. Lett. 96 213105
[2] Zan H W, Li C H 2011 Appl. Phys. Lett. 98 253503
[3] Hwang B W, Lee S C 2012 14th International Meeting on Chemical Sensors Nuremberg, Germany, May 20-23, 2012 p1617
[4] Zhang X Y, Jiang H 2012 Atmos. Environ. 46 590
[5] Tang Y Y, Liu W Q, Kan R F 2010 Acta Phys. Sin. 59 2364 (in Chinese) [汤媛媛, 刘文清, 阚瑞峰 2010 59 2364]
[6] Chen J L, Ling L Y, Andreas H, Zheng N N 2012 Chin. Phys. B 21 119301
[7] Wang Z R, Zhou B, Wang S S 2011 Acta Phys. Sin. 60 060703 (in Chinese) [王焯如, 周斌, 王珊珊 2011 60 060703]
[8] Sun Y W, Zeng Y, Liu W Q, Xie P H, Chen J L 2012 Chin. Phys. B 21 090701
[9] Persijin S T, Santosa E, Harren F J M 2002 Appl. Phys. B 75 335
[10] Narasinmhan L R, Goodman W, Patel C K N 2001 Proc. Natl. Acad. Sci. USA 98 4617
[11] Yuan C Y, Yan Z X, Meng G, Li Z H, Shang L P 2010 Acta Phys. Sin. 59 6908 (in Chinese) [袁长迎, 炎正馨, 蒙瑰, 李智慧, 尚丽平 2010 59 6908]
[12] Peng Y, Yu Q X 2009 Spectrosc. Spect. Anal. 29 2030 (in Chinese) [彭勇, 于清旭 2009 光谱学与光谱分析 29 2030]
[13] Chen W G, Zhou H Y, Huang H X, Tang J 2010 Chin. J. Sci. Instrum. 31 665 (in Chinese) [陈伟根, 周恒逸, 黄会贤, 唐炬 2010 仪器仪表学报 31 665]
[14] Wu H P, Dong L, Zheng H D, Liu Y Y, Ma W G 2012 Acta Phys. Sin. 62 070701 (in Chinese) [武红鹏, 董磊, 郑华丹, 刘妍妍, 马维光 2012 62 070701]
[15] Li J S, Gao X M, Fang L 2007 Opt. Laser Technol. 39 1144
[16] Rothman L S, Jacquemart D, Barbe A 2005 J. Quant. Spectrosc. Radiat. Transfer 96 139
[17] Diebold G J 2003 Rev. Sci. Instrum. 74 801
[18] Bernegger S, Sigrist M W 1990 Rev. Infrared Phys. 30 375
[19] Bijnen F G C, Reuss J, Harren F J M 1996 Rev. Sci. Instrum. 67 2914
[20] Li L D 2011 J. Liaoning Tech University (Nat. Sci) 30 202 (in Chinese) [李丽丹 2011 辽宁工程技术大学学报(自然科学版) 30 202]
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