高温条件下光谱线型模型对光谱反演的影响分析  

Influence Analysis of Spectral Line-Shape Models on Spectral Diagnoses Under High-Temperature Conditions

作　　者：曾思贤 任欣 何浩轩 聂伟 ZENG Si-xian;REN Xin;HE Hao-xuan;NIE Wei(School of Electric Power,South China University of Technology,Guangzhou 510641,China;Anhui Institute of Optics and Fine Mechanics,Hefei Institutes of Physical Sciences,Chinese Academy of Sciences,Hefei 230031,China)

机构地区：[1]华南理工大学电力学院,广东广州510641 [2]中国科学院合肥物质科学研究院安徽光学精密机械研究所,安徽合肥230031

出　　处：《光谱学与光谱分析》2023年第9期2715-2721,共7页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金青年科学基金项目(62105104),广州市基础研究计划-基础与应用基础研究项目(202102020726)资助。

摘　　要：针对高温条件下光谱高精度反演的需求,对比分析了7种不同的光谱线型模型在光谱反演中的精度和稳定性,并发展了适用于高温诊断的光谱线型选择策略。首先测量了1100~1600 K温度范围的两条H 2O吸收光谱,采用七种不同的光谱线型模型分别进行分析,获取了各测量光谱的积分吸光度,速度依赖线宽和多普勒半高宽,并根据双线比值法计算气体温度值。对比分析表明,在高温常压条件下,Gaussian线型拟合精度最差,但通过Gaussian线型反演的气体温度精度最高;光谱拟合过程中,通过设置线型模型中的多普勒半高宽参数为已知量,能有效提高光谱线参数的反演稳定性和精度,也能有效提高各光谱线型温度反演精度。与高阶非Voigt线型(Speed-dependent Voigt线型,Rautian线型,Speed-dependent Rautian线型和Hartman-Tran线型)对比,Voigt线型获取的积分吸光度和速度依赖线宽偏小,计算的温度结果相对误差偏大。最后,对比了7种线型模型拟合程序的运行时间,在保证精度的条件下,Speed-dependent Voigt线型拟合速度最快。因此,通过Gaussian线型获取气体温度,然后根据温度计算多普勒半高宽参数并将其固定为已知量,采用Speed-dependent Voigt线型拟合能有效提高高温光谱的反演精度,速度和稳定性。To achieve high-precision spectral retrieval under high-temperature conditions,we compared and analyzed the accuracy and stability of seven different spectral line-shape profiles and developed a spectral line-shape profile selection strategy suitable for high-temperature diagnosis.Firstly,two H 2O absorption spectra in the temperature range of 1100~1600 K were measured experimentally,and seven different spectral profiles were used to fit them respectively.The integral absorbance,velocity-dependent line-width and Doppler half height and half-width(FWHM)of each measured spectrum were obtained,and the gas temperature value was calculated according to the line-intensity ratio method.The comparative analysis show that under the condition of high temperature and atmospheric pressure,the fitting accuracy of the Gaussian profile is the worst,and the gas temperature inversion accuracy of the Gaussian profile is the highest;Setting the Doppler half-height width parameter in the line-shape profile as a constant can not only effectively improve the stability and accuracy of spectral line parameter inversion,but also improve the temperature inversion accuracy of each spectral line-shape profile.Compared with the non-Voigt profile(speed-dependent Voigt profile,Rautian profile,Speed-dependent Rautian profile and Hartman tran profile),the integral absorbance and velocity-dependent line-width obtained by the Voigt profile are small,and the relative error of calculated temperature are large.Finally,the running time of seven line-shape profile fitting programs was compared.Under the condition of ensuring accuracy,the speed-dependent Voigt profile calculation speed is the fastest.Therefore,the gas temperature is obtained by Gaussian Profile.The Doppler half height and half width are calculated according to the temperature and fixed as a constant,and the speed-dependent Voigt profile is used to fit the measured spectrum,which can effectively improve the inversion accuracy,velocity and stability of high-temperature spectrum.

关 键 词：光谱线型 TDLAS 积分吸光度 速度平均线宽 多普勒半高半宽 温度 

分 类 号：O433.4[机械工程—光学工程]