Precise measurements the broadening characteristics and parameters of methane near-infrared absorption spectrum at high pressure
Received:February 19, 2020  Revised:November 11, 2020  download
Citation:
Hits: 96
Download times: 90
Author NameAffiliationE-mail
HE Ying Key Laboratory of Environmental Optics & Technology Anhui Institute of Optics and Fine Mechanics Chinese Academy of Sciences Hefei 230031 China heying@aiofm.ac.cn 
ZHANG Yu-Jun Key Laboratory of Environmental Optics & Technology Anhui Institute of Optics and Fine Mechanics Chinese Academy of Sciences Hefei 230031 China
University of Science and Technology of China Hefei 230026 China 
yjzhang@aiofm.ac.cn 
YOU Kun Key Laboratory of Environmental Optics & Technology Anhui Institute of Optics and Fine Mechanics Chinese Academy of Sciences Hefei 230031 China  
FAN Bo-Qiang Key Laboratory of Environmental Optics & Technology Anhui Institute of Optics and Fine Mechanics Chinese Academy of Sciences Hefei 230031 China
University of Science and Technology of China Hefei 230026 China 
 
LI Meng-Qi Key Laboratory of Environmental Optics & Technology Anhui Institute of Optics and Fine Mechanics Chinese Academy of Sciences Hefei 230031 China
University of Science and Technology of China Hefei 230026 China 
 
YU Dong-Qi Key Laboratory of Environmental Optics & Technology Anhui Institute of Optics and Fine Mechanics Chinese Academy of Sciences Hefei 230031 China
University of Science and Technology of China Hefei 230026 China 
 
XIE Hao Key Laboratory of Environmental Optics & Technology Anhui Institute of Optics and Fine Mechanics Chinese Academy of Sciences Hefei 230031 China
University of Science and Technology of China Hefei 230026 China 
 
LEI Bo-En Key Laboratory of Environmental Optics & Technology Anhui Institute of Optics and Fine Mechanics Chinese Academy of Sciences Hefei 230031 China
University of Science and Technology of China Hefei 230026 China 
 
JIA Wei College of Mechanical and Electrical Engineering Anhui Jianzhu University Hefei 230601 China  
JING Jun-Sen College of Mechanical and Electrical Engineering Anhui Jianzhu University Hefei 230601 China  
LIU Wen-Qing Key Laboratory of Environmental Optics & Technology Anhui Institute of Optics and Fine Mechanics Chinese Academy of Sciences Hefei 230031 China
University of Science and Technology of China Hefei 230026 China 
 
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-pressure 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 broadening characteristics in high-pressure environment lays foundation for spectrum detecting in industrial environment.
keywords:laser absorption spectroscopy  spectrum broadening characteristics  empirical mode decomposition algorithm  high pressure  methane  pressure shift
View Full Text  HTML  View/Add Comment  Download reader

Copyright:《Journal of Infrared And Millimeter Waves》