红外与毫米波学报2020，Vol.39Issue(6)：742-748,7.DOI:10.11972/j.issn.1001-9014.2020.06.012
高压甲烷近红外吸收光谱展宽特性及参数精确测量
Precise measurements the broadening characteristics and parameters of methane near-infrared absorption spectrum at high pressure
摘要
Abstract
The high-pressure absorption spectrum at 6046.96 cm-1 of methane was obtained with the measurement experimental platform.The empirical mode decomposition algorithm was used to filter out the detection noise caused by window deformation at high-pressure.Consequently,the overall root-mean-square error(RMSE)of absorbance signal was reduced by 3.87 times,and the residual error of absorbance signal fitting was lower than ± 1％ by using Lorentz line-type fitting algorithm.These studies showed that the absorption line width increased with the pressure increasing,and the mutual broadening coefficient of nitrogen-methane molecules at high-pres-sure was calculated as 0.0631 cm-1atm-1.Moreover,the absorption line appeared a"red shift"phenomenon as the pressure increasing,and the pressure shift coefficient of nitrogen-induced was calculated as-0.00848 cm-1atm-1.Therefore,a method of concentration inversion at high pressure was proposed by the linear relationship between the detection wavelength,pressure,and pressure shift coefficient.In conclusion,the research on spectrum broad-ening characteristics in high-pressure environment lays foundation for spectrum detecting in industrial environ-ment.关键词
激光吸收光谱/光谱展宽特性/经验模态分解算法/甲烷/压力频移Key words
laser absorption spectroscopy/spectrum broadening characteristics/empirical mode decomposition algorithm/high pressure/methane/pressure shift分类
数理科学引用本文复制引用
何莹,经俊森,刘文清,张玉钧,尤坤,范博强,李梦琪,余冬琪,谢皓,雷博恩,贾巍..高压甲烷近红外吸收光谱展宽特性及参数精确测量[J].红外与毫米波学报,2020,39(6):742-748,7.基金项目
Supported by National Natural Science Foundation of China(4180512),Key Research and Development Projects of Anhui Province (201904a07020093),Natural Science Foundation of Anhui Province(1808085MD107,1808085QD113),Key Project of University Natural Science Re-search Project of Anhui Province(KJ2019A0793)and Research Project of Anhui Jianzhu University(JZ192037). （4180512）
