利用波长调制光谱技术测量高温环境中的气体压强、温度和H_2O组分浓度
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摘要
利用基于可调谐半导体激光器的扫描波长调制光谱技术,实现了高温燃烧场内气体参数的测量。提出了基于迭代算法实现气体压强、温度和组分浓度同时测量的方法,迭代算法具有收敛速度快以及对初始值不敏感等优点。采用频分复用技术,利用两条H_2O吸收谱线(7 454.45和6 806.03cm-1)的谐波信号,对高温燃烧场进行了实验研究,并将气体压强、温度和H_2O组分浓度测量结果与压力传感器、热电偶和直接吸收光谱法的测量结果进行比较,结果表明,基于波长调制光谱技术测得的气体压强、温度和H_2O浓度与预测值基本符合,最大偏差分别在7.6%,8.1%和7.5%以内。此方法具有多参数同时测量、免标定等显著优势,但由于依赖的参数较多,容易对测量精度造成影响。
The calibration-free measurement of gas parameters can be realized according to scanning-wavelength modulation spectroscopy technology which is based on tunable diode laser.A method based on an iteration algorithm which can be used to measure gas temperature,pressure and H_2O concentration simultaneously is put forward.The iteration algorithm is less sensitive to initial values and has rapid convergence rate.Frequency division multiplexing technology is adopted to study the high temperature combustion flow using the harmonic signals of two H_2O absorption transitions(7454.45 and 6 806.03cm-1 repectively).Compared with thermocouple readings,pressure value of pressure transducer,and H_2O concentration by direct absorption spectroscopy,experimental results show that the measured gas temperature,H_2O concentration and temperature are consistent with the predicted value and the most relative errors are 7.6%,8.1% and 7.5% respectively.
The calibration-free measurement of gas parameters can be realized according to scanning-wavelength modulation spectroscopy technology which is based on tunable diode laser.A method based on an iteration algorithm which can be used to measure gas temperature,pressure and H_2O concentration simultaneously is put forward.The iteration algorithm is less sensitive to initial values and has rapid convergence rate.Frequency division multiplexing technology is adopted to study the high temperature combustion flow using the harmonic signals of two H_2O absorption transitions(7454.45 and 6 806.03cm-1 repectively).Compared with thermocouple readings,pressure value of pressure transducer,and H_2O concentration by direct absorption spectroscopy,experimental results show that the measured gas temperature,H_2O concentration and temperature are consistent with the predicted value and the most relative errors are 7.6%,8.1% and 7.5% respectively.
引文
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[2]Hanson R K.Proceedings of the Combustion Institute,2011,33:1.
[3]Liu J T C,Rieker G B,Jeffries J B,et al.Applied Optics,2005,44:6701.
[4]Wilson G V H.Journal of Applied Physics,1965,34:3276.
[5]Philippe L C,Hanson R K.Applied Optics,1993,32(30):6090.
[6]Li H J,Rieker G B,Liu X,et al.Applied Optics,2006,45(5):1052.
[7]Rieker G B,Jeffries J B,Hanson R K.Applied Optics,2009,48:5546.
[8]LI Ning,WENG Chun-sheng(李宁,翁春生).Acta Physica Sinica(物理学报),2011,60(7):070701.
[9]Gamache R R,Kennedy S,Hawkins R,et al.Journal of Molecular Structure,2000,517-518:407.
[10]Zhou X,Jeffries J B,Hanson R K.Applied Physics B,2005,81:711.
[11]Liu X,Jeffries J B,Hanson R K,et al.Applied Physics B,2006,82:469.
[12]Zhou X,Liu X,Jeffries J B,et al.Measurement Science and Technology,2003,14:1459.
[13]Rothman L S,Gordon I E,Babikov Y,et al.Journal of Quantitative Spectroscopy&Radiative Transfer,2013,130:4.
[14]Chang L S,Jeffries J B,Hanson R K.AIAA Journal,2007,45(2):411.
[15]Goldenstein C S,Spearrin R M,Schultz I A,et al.Measurement Science and Technology,2014,25:055101.