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基于单分析通道非分散红外(non-dispersive infrared, NDIR)气体分析技术, 提出一种单组分双分析通道气体检测方法. 根据SO2的红外吸收特征, 采用逐线积分气体吸收模型和方法, 选择洛伦兹展宽线型并考虑温度和气压对积分线强、线型的影响, 确定了两个分析通道的滤波参数.使用7.32 μm和4 μm波段分别反演小于等于 280 ppm与大于280 ppm的SO2浓度;使用最小二乘法, 以三阶多项式为拟合模型, 获得了两个分析通道的定标曲线.对系统的测量线性度、检测限和测量准确度进行了分析. 两个分析通道的联合可以实现约几ppm至10000 ppm的宽动态范围的SO2测量, 且系统测量线性度大于0.99, 测量误差小于5%.既克服了NDIR气体分析技术检测灵敏度和宽动态测量范围不能同时兼顾的缺陷, 良好的系统测量线性度还为多组分气体分析的干扰修正提供了非常必要的前提条件.In this paper, we propose a method of measuring a gas by using non-dispersive infrared (NDIR) technique with two analysis channels. The filter parameters of the two analysis channels are calculated by line-by-line integral of the selected absorption spectrum of SO2. The influences of temperature and air pressure on strengths and Lorentzian shape functions are considered accurately in the calculation. The absorption wavelengths at 7.32 μm and 4.0 μm are chosen to detect the SO2 whose concentrations are ≤qslant 280 ppm and > 280 ppm, respectively. The calibration curves of the two analysis channels are obtained by least-squares fitting two 3-order polynomials. The linearity, the sensitivity and the accuracy of the analysis system are analyzed. SO2 concentration with a large range from ～ 5 ppm to 10000 ppm can be retrieved with the measurement linearity > 0.99 and measurement error < 5%. The reasonable tradeoff is made to optimize both sensitivity and measurement range jointly. A fair balance between measurement sensitivity and large span range is obtained. Furthermore, sufficiently good measurement linearity makes cross-interference correction possible in the NDIR multi-gas analyzer.
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Keywords:
- environmental pollution measurements /
- infrared technology /
- NDIR /
- gas analysis
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[2] Krings T, Gerilowski K, Buchwitz M, Reuter M, Tretner A, Erzinger J, Heinze D, Burrows J P, Bovensmann H 2011 Atmos. Meas. Tech. 4 2207
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[5] Goody R M 1968 J. Opt. Soc. Am. 58 900
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[10] Heusinkveld B G, Adrie F G J, Albert A M H 2008 Agr. Forest Meteorol. 148 1563
[11] Sun Y W, Liu W Q, Wang S M, Huang S H 2011 Infrared 5 32 (in Chinese) [孙友文, 刘文清, 汪世美, 黄书华 2011 红外 5 32]
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[14] Sun Y W, Liu W Q, Wang S M, Huang S H, Yu X M 2011 Chin. Opt. Lett. 3 9
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[16] Burch D E, Singleton E B, Williams D 1962 Appl. Opt. 1 359
[17] Sparks L 1997 J. Quant. Spectrosc. Radiat. Trans. 53 633
[18] York D 1968 Earth Planet. Sci. Lett. 5 320
[19] Marcel M, Andreas D Z 1990 Anal. Chem. 62 2220
[20] Tan Q L, Zhang W D, Xue C Y, Xiong J J 2008 Opt. Laser Technol. 40 703
[21] David L, Li-7500 CO2 / H2O Analyzer Instruction Manual, D 2004 http: // www. licor. com / env / products / eddy_corariance / LI-7500A [2011. 9. 12]
[22] Zhang S N, Luo Z Y, Shen W D, Liu X, Zhang Y G 2011 Acta Phys. Sin. 60 14221 (in Chinese) [张淑娜, 罗震岳, 沈伟东, 刘旭, 章岳光 2011 60 14221]
[23] Hao N, Zhou B, Chen L M 2006 Acta Phys. Sin. 55 1529 (in Chinese) [郝楠, 周斌, 陈立民 2006 55 1529]
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[1] Shindell D T, Faluvegi G, Koch D M, Schmidt G A, Unger N, Bauer S E 2009 Science 326 716
[2] Krings T, Gerilowski K, Buchwitz M, Reuter M, Tretner A, Erzinger J, Heinze D, Burrows J P, Bovensmann H 2011 Atmos. Meas. Tech. 4 2207
[3] Kidd G 2002 Spectrochimica Acta Part A 58 2373
[4] Herget W F, Jahnke J A, Burch D E, Gryvnak D A 1976 Appl. Opt. 15 1222
[5] Goody R M 1968 J. Opt. Soc. Am. 58 900
[6] Lopez F, Frutos J D 1993 Sensors and Actuators A: Physical 37 502
[7] Harold S L, Satoru S, Louis J D, Alberto M G 1999 (US Patent) 5886348 [1999.03.23]
[8] Andre G, Gerard F, Pierre C 1985 Appl. Opt. 24 14
[9] Dirk A, Gaston E M, Shrikrishna H N, Robert F M 2009 (US Patent) 12112 436 [2009.08.27]
[10] Heusinkveld B G, Adrie F G J, Albert A M H 2008 Agr. Forest Meteorol. 148 1563
[11] Sun Y W, Liu W Q, Wang S M, Huang S H 2011 Infrared 5 32 (in Chinese) [孙友文, 刘文清, 汪世美, 黄书华 2011 红外 5 32]
[12] Sun Y W, Liu W Q, Wang S M, Huang S H 2011 Spectrosc. Spect. Anal. 10 31 (in Chinese) [孙友文, 刘文清, 汪世美, 黄书华 2011 光谱学与光谱分析 10 31]
[13] Sun Y W, Liu W Q, Zeng Y, Wang S M, Huang S H 2011 Chin. Phys. Lett. 28 28
[14] Sun Y W, Liu W Q, Wang S M, Huang S H, Yu X M 2011 Chin. Opt. Lett. 3 9
[15] Rothman L S, Jaquemart D, Barbe A 2005 J. Quant. Spectrosc. Radiat. Trans. 96 139
[16] Burch D E, Singleton E B, Williams D 1962 Appl. Opt. 1 359
[17] Sparks L 1997 J. Quant. Spectrosc. Radiat. Trans. 53 633
[18] York D 1968 Earth Planet. Sci. Lett. 5 320
[19] Marcel M, Andreas D Z 1990 Anal. Chem. 62 2220
[20] Tan Q L, Zhang W D, Xue C Y, Xiong J J 2008 Opt. Laser Technol. 40 703
[21] David L, Li-7500 CO2 / H2O Analyzer Instruction Manual, D 2004 http: // www. licor. com / env / products / eddy_corariance / LI-7500A [2011. 9. 12]
[22] Zhang S N, Luo Z Y, Shen W D, Liu X, Zhang Y G 2011 Acta Phys. Sin. 60 14221 (in Chinese) [张淑娜, 罗震岳, 沈伟东, 刘旭, 章岳光 2011 60 14221]
[23] Hao N, Zhou B, Chen L M 2006 Acta Phys. Sin. 55 1529 (in Chinese) [郝楠, 周斌, 陈立民 2006 55 1529]
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