Voigt线型两翼拟合非均匀流场吸光度的方法研究
[Abstract]:In the absorption field, especially in the tunable semiconductor laser direct absorption spectroscopy (dTDLAS) technology, it is necessary to accurately measure the integral absorbance of the absorption spectrum in order to accurately reverse the flow field temperature, component concentration and other parameters. For the non-uniform flow field, the spectral broadening along the measurement path varies with the state of the flow field. Voigt or Lorentz lines are used to fit the absorbance curve or to obtain the integral absorbance value directly by numerical integration of the absorbance curve. The possible errors introduced by the method are simulated and analyzed. In order to reduce the fitting error, the method of fitting absorbance of Voigt linear two wings is proposed to obtain the integral absorbance of absorption spectrum. Eight absorption lines with different low energy levels are selected by using H _ 2O as the target gas in flow field measurement. Two kinds of non-uniform flow field models are established using the flat flame furnace as the prototype. The inhomogeneity of the flow field is treated by the piecewise method. The integral absorbance values of the two models are calculated by using the Voigt fitting method, the numerical integration method and the Voigt linear fitting method, respectively. The error of each method is obtained by comparing with the theoretical integral absorbance. Thus, the method of obtaining integral absorbance value under different non-uniform flow field is determined.
【作者单位】: 中国科学院安徽光学精密机械研究所环境光学与技术重点实验室;中国科学技术大学;上海卫星工程研究所;
【基金】:国家重大科学仪器设备开发专项项目(2014YQ060537)资助
【分类号】:O657.3
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