Study on the Method of Voigt Profiles Two Wings Fitting Non-Uniform Flow Field Absorbance

	Study on the Method of Voigt Profiles Two Wings Fitting Non-Uniform Flow Field Absorbance
刊名	SPECTROSCOPY AND SPECTRAL ANALYSIS
	2017
卷号	37
关键词	TUNABLE DIODE-LASER MU-M ABSORPTION SPECTROSCOPY PARAMETERS H2O Tunable diode laser absorption spectroscopy Integral area Voigt profile two wings fitting method Non-uniform flow field
ISSN号	1000-0593
其他题名	Study on the Method of Voigt Profiles Two Wings Fitting Non-Uniform Flow Field Absorbance
英文摘要	In the field of the absorption spectrum, especially for direct tunable diode laser absorption spectroscopy (dTDLAS) technology, the integrated area of the absorption spectrum is needed to be measured accurately for calculating the temperature and the component concentration of the flow field. Doing single optical path absorption spectroscopic measurement in the non -uniform flow field, spectral lineshape broadening is varied with the flow changes, in previous research reports, researchers mainly use single Voigt or Lorentz profile to fit absorbance curve or use directly integral to obtain the integrated area of the absorption spectrum. There are some shortcomings in these methods, resulting in certain error between the fitting result and the actual area, which is not conducive to the accurate measurement of flow field parameters. Firstly, the error is analyzed theoretically, and then, we adopt the simulation method to obtain the error size of the method. Finally, we proposed the Voigt wings fitting absorbance method to reduce the fitting error. The operation of Voigt wings fitting method is to Select the wings of the spectral line, and then use Voigt profile fitting, The difference between the two wings was used the numerical integral method to calculate area, the integrated area is sum of Voigt profile fitting area and numerical integral area. We have used water vapor as the target gas, with eight absorption lines which have different low-level states energy from HITRAN 2012 database being selected-, building two kinds of non -uniform flow field model base on the flat flame furnace, and through the method of segmentation to equivalent processing the no uniformity of flow field. Using Voigt profile fitting method, numerical integral method and Voigt profile wings fitting method to obtain the integral area of models, the error size is obtained by comparing with the theoretical value. As the result of contrast, the fitting error of Voigt profile fitting method is large and related to the different absorption line, the error of numerical integral method is biggest but it is nothing to do with absorption line, the fitting error of Voigt profile wings fitting method is least and stable. By force of contrast, we determined the appropriate method to obtain integral area in the different *non -uniform flow field, which is beneficial to obtain accurate integrated area and flow field parameters.
语种	英语
CSCD记录号	CSCD:5939521
内容类型	期刊论文
源URL	[http://ir.hfcas.ac.cn:8080/handle/334002/61244]
专题	中国科学院合肥物质科学研究院
推荐引用方式 GB/T 7714	. Study on the Method of Voigt Profiles Two Wings Fitting Non-Uniform Flow Field Absorbance[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS,2017,37.
APA	(2017).Study on the Method of Voigt Profiles Two Wings Fitting Non-Uniform Flow Field Absorbance.SPECTROSCOPY AND SPECTRAL ANALYSIS,37.
MLA	"Study on the Method of Voigt Profiles Two Wings Fitting Non-Uniform Flow Field Absorbance".SPECTROSCOPY AND SPECTRAL ANALYSIS 37(2017).