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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
[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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[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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