Spectral analysis and line strength measurement method of near-infrared overlapped absorption lines
Received:September 04, 2017  Revised:September 25, 2017  download
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Author NameAffiliationE-mail
JIA Wei Mechanical and electrical engineering college,Anhui Jianzhu University,Hefei,Anhui,
China 
jwaiofm@163.com 
HE Ying Key Laboratory of Environmental Optics Technology,Anhui Institute of Optics and Fine Mechanics,the Chinese Academy of Sciences,Hefei,Anhui  
ZHANG Yu-Jun Key Laboratory of Environmental Optics Technology,Anhui Institute of Optics and Fine Mechanics,the Chinese Academy of Sciences,Hefei,Anhui yjzhang@aiofm.ac.cn 
LIU Jian-Guo Key Laboratory of Environmental Optics Technology,Anhui Institute of Optics and Fine Mechanics,the Chinese Academy of Sciences,Hefei,Anhui  
LIU Wen-Qing Key Laboratory of Environmental Optics Technology,Anhui Institute of Optics and Fine Mechanics,the Chinese Academy of Sciences,Hefei,Anhui  
WANG Min Mechanical and electrical engineering college,Anhui Jianzhu University,Hefei,Anhui  
ZHANG Run-Mei Mechanical and electrical engineering college,Anhui Jianzhu University,Hefei,Anhui  
Abstract:In recent years, near-infrared laser absorption spectroscopy detection technique has developed rapidly, and spectral analysis of absorption lines is one of the important research contents of spectrum detection. The experimental platform for gas laser absorption spectroscopy measurement was established in this study, moreover the experiment of ammonia characteristic spectroscopy analysis at 6528.8 cm-1 and algorithm research were carried out. Experimental results show that the root mean square error of the measured signal reduced 4.45 times after combined with wavelet denoising method, and the fitting residual error of overlapped absorption lines was lower than 2% by using multi-line Voigt line profile fitting algorithm. In the experiment, the ammonia characteristic absorption spectrum of different pressures at room temperature was obtained, and the line strength parameters of each absorption line were also calculated. The relative deviation between the measured results and Hitran database was between 5.67~8.2%,and the uncertainty of calculated line strength was about 4.6%. The accurate measurement of line strength by the effective spectrum analysis algorithm of overlapped absorption lines is in favor for improving the accuracy of ammonia concentration inversion.
keywords:laser absorption spectroscopy  spectrum analysis  wavelet denoising  line profile fitting  line strength
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Copyright:《Journal of Infrared And Millimeter Waves》