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光谱线宽对可调谐激光调制吸收光谱技术测量CO2浓度的影响

Effect of Linewidth on Measurement of CO2 by Wavelength Modulation Absorption Spectrometry Using Tunable Diode Laser

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摘要

在利用可调谐激光调制吸收光谱技术进行测量时,气体参量改变将导致线宽变化,从而影响二次谐波信号峰值的大小。针对于Lorentz线型,给出了线宽变化对二次谐波峰值影响的理论分析及利用二次谐波信号峰谷比值进行修正的方法。在10 cm的吸收池内利用1578.22 nm处的吸收谱线对CO2进行了测量,在不同调制幅度下验证了不同工况中线宽对二次谐波信号的影响。结果表明,利用二次谐波峰谷比值确定调制系数进行修正可有效地减小由于工况改变时线宽变化对测量带来的影响,当压力由1.0×105Pa变化至1.5×105Pa时,修正前后的测量相对误差分别为34.3%与1.8%; 当气体体积分数在20%~100%变化时,修正前后的平均误差分别为12.8%与1.8%。

Abstract

The gas concentration calculated from second harmonic signal would be affected by the variety of linewidth induced by different gas parameters during the measurement by wavelength modulation absorption spectrometry using tunable diode laser. The effect of linewidth variety on second harmonic signal for Lorentz lineshape was analyzed. A correction method using ratio of peak to valley from second harmonic signal was also given here. The experiment on CO2 concentration at 1578.22 nm was carried out in a 10 cm absorption cell with different modulation amplitudes, gas pressures and concentrations to validate the effect of linewidth variey on second harmonic signal. The results show that the relative errors of gas concentration would be decreased from 34.3% to 1.8% by correction method when the pressure rises from 1.0×105 Pa to 1.5×105 Pa, and decreased from 12.8% to 1.8% by correction method when the gas concentration changes from 20% to 100%. The correction method can eliminate the effect of linewidth variety on gas measurement by second harmonic signal effectively.

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中图分类号:O 433.5

所属栏目:测量与计量

基金项目:国家自然科学基金重点项目(60534030)和国家自然科学基金(50576082)资助课题。

收稿日期:2008-02-18

修改稿日期:2008-04-07

网络出版日期:0001-01-01

作者单位    点击查看

李宁:浙江大学能源清洁利用国家重点实验室,浙江 杭州 310027
严建华:浙江大学能源清洁利用国家重点实验室,浙江 杭州 310027
王飞:浙江大学能源清洁利用国家重点实验室,浙江 杭州 310027
池涌:浙江大学能源清洁利用国家重点实验室,浙江 杭州 310027
岑可法:浙江大学能源清洁利用国家重点实验室,浙江 杭州 310027

联系人作者:李宁(phoenixkyo@163.com)

备注:李宁(1981-),男,博士研究生,主要从事可调谐激光吸收光谱测量方面的研究。

【1】R.M. Mihalcea, D.S. Baer, R.K. Hanson. Diode laser sensor for measurements of CO, CO2, and CH4 in combustion flows[J]. Appl. Opt., 1997, 36(33): 8745~8752

【2】D.M. Sonnenfroh , M.G. Allen. Observation of CO and CO2 absorption near 1.57 mm with an external-cavity diode laser[J]. Appl. Opt., 1997, 36(15): 3298~3300

【3】Chen Dong , Liu Wenqing , Zhang Yujun, et al.. Tunable diode laser spectroscopy system for fire gases sensing[J]. Chinese J . L asers, 2006, 33(11): 1552~1556
陈东, 刘文清, 张玉钧等. 可调谐半导体激光光谱火灾气体探测系统[J]. 中国激光,2006, 33(11): 1552~1556

【4】Kan Ruifeng, Liu Wenqing, Zhang Yujun et al.. Infrared absorption spectrometer of monitoring ambient methane[J]. Acta Optica Sinica, 2006, 26(1): 67~70
阚瑞峰, 刘文清, 张玉钧等. 基于可调谐激光吸收光谱的大气甲烷监测仪[J]. 光学学报, 2006, 26(1): 67~70

【5】M.E. Webber, D.S. Baer, R.K. Hanson. Ammonia monitoring near 1.5 mm with diode-laser absorption sensors[J]. Appl.Opt., 2001, 40(12): 2031~2042

【6】X. Zhou, X. Liu, J.B. Jeffries et al.. Development of a sensor for temperature and water concentration in combustion gases using a single tunable diode laser[J]. Measur. Sci. and Technol., 2003, 14: 1459~1468

【7】J.T.C. Liu, J.B. Jeffries, R.K. Hanson. Wavelength modulation absorption spectroscopy with 2f detection using multiplexed diode lasers for rapid temperature measurements in gaseous flows[J]. Appl. Phys. B, 2004, 78: 503~511

【8】Wang Jian, Huang Wei, Gu Haitao et al.. Gas temperature measurement with tunable diode laser absorption spectroscopy[J]. Acta Optica Sinica, 2007, 27(9): 1639~1642
王健, 黄伟, 顾海涛等. 可调谐二极管激光吸收光谱法测量气体温度[J]. 光学学报,2007,27(9):1639~1642

【9】L.S. Rothman, C.P. Rinsland, A. Goldman et al.. The HITRAN molecular spectroscopic database and HAWKS (HITRAN atmospheric workstation):1996 edition[J].J. of QS & RT,1998,60(5):665~710

【10】J. Reid, D. Labrie. Second harmonic detection with tunable diode lasers-Comparison of experiment and theory[J]. Appl. Phys. B, 1981, 26: 203~210

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