Research on a method of eliminating the line broadening caused by the wavelength shift based on the first harmonic

doi:10.1364/OE.442789

	Research on a method of eliminating the line broadening caused by the wavelength shift based on the first harmonic
	Tang Qi-Xing 3; Zhang Yu-Jun 1; Chen Dong 2; He Ying 1
刊名	OPTICS EXPRESS
	2021-11-08
卷号	29
ISSN号	1094-4087
DOI	10.1364/OE.442789
通讯作者	Tang Qi-Xing(qxtang@ahau.edu.cn) ; Zhang Yu-Jun(yjzhang@aiofm.ac.cn)
英文摘要	Using laser spectroscopy for gas detection, short-term rapid changes in ambient temperature, system noise, and circuit aging are likely to cause line broadening, which affects the accuracy of gas concentration measurement. Firstly, the correction method of the impact on line broadening is analyzed theoretically. A method is proposed to eliminate the line broadening caused by the wavelength shift based on the first harmonic detection. After removing the background noise and filtering, the standard harmonic fitting and broadening elimination are carried out. Meanwhile, a methane gas detection system is established and experiments are conducted. The experimental results show that after the standard harmonic fitting, the maximum value of the baseline is reduced from 2 to 0.078, and the maximum absolute value of the baseline in the absorption-free region is reduced from 2.07 to 0.072. The standard deviation after the broadening correction is 0.047, and the standard deviation without considering the effect of broadening is 0.203, which proves that the accuracy of trace gas detection is improved and has good engineering practical value. (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement.
资助项目	National Natural Science Foundation of China[52105539] ; Natural Science Research for Universities in Anhui Province[KJ2020A0104] ; National Engineering Laboratory of Advanced Technology and Equipment for Atmospheric Pollution Monitoring[2005DP173065-2021-04]
WOS关键词	TRACE GAS-DETECTION ; MODULATION SPECTROSCOPY ; TEMPERATURE ; ABSORPTION ; ABSORBENCY
WOS研究方向	Optics
语种	英语
出版者	OPTICAL SOC AMER
WOS记录号	WOS:000716468800112
资助机构	National Natural Science Foundation of China ; Natural Science Research for Universities in Anhui Province ; National Engineering Laboratory of Advanced Technology and Equipment for Atmospheric Pollution Monitoring
内容类型	期刊论文
源URL	[http://ir.hfcas.ac.cn:8080/handle/334002/126516]
专题	中国科学院合肥物质科学研究院
通讯作者	Tang Qi-Xing; Zhang Yu-Jun
作者单位	1.Chinese Acad Sci, Anhui Inst Opt & Fine Mech, Key Lab Environm Opt & Technol, Hefei 230031, Peoples R China 2.Hefei Univ Technol, Hefei 230009, Peoples R China 3.Anhui Agr Univ, Hefei 230061, Peoples R China
推荐引用方式 GB/T 7714	Tang Qi-Xing,Zhang Yu-Jun,Chen Dong,et al. Research on a method of eliminating the line broadening caused by the wavelength shift based on the first harmonic[J]. OPTICS EXPRESS,2021,29.
APA	Tang Qi-Xing,Zhang Yu-Jun,Chen Dong,&He Ying.(2021).Research on a method of eliminating the line broadening caused by the wavelength shift based on the first harmonic.OPTICS EXPRESS,29.
MLA	Tang Qi-Xing,et al."Research on a method of eliminating the line broadening caused by the wavelength shift based on the first harmonic".OPTICS EXPRESS 29(2021).