An approach to gas sensors based on tunable diode laser incomplete saturated absorption spectra

• 作者: Wei Nie Zhen-Yu Xu Rui-Feng Kan Mei-Rong Dong Ji-Dong Lu
• 来源期刊: 中国物理B（英文版）
• 年，卷（期）: 2021,（6）
• 所属期刊栏目: ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS
• 页码范围: 414-422
• 页数: 9页
• 语种: 英文
• DOI: 10.1088/1674-1056/abd769

摘要

A spectral profile reconstruction method that can be applied to incomplete saturated-absorption spectra is proposed and demonstrated.Through simulation and theoretical calculation,it is proved that compared with the traditional whole-profile fitting method,this new method can increase the concentration detection upper limit of a single absorption line by about 8.7 times.High-concentration water vapor is measured using TDLAS technology,the total water vapor pressure and the self-broadened half-width coefficient of the spectrum were simultaneously measured from incomplete saturated-absorption spectra and compared with high-precision pressure sensors and the HITRAN databases.Their maximum relative deviations were about 4.63％ and 9.10％,respectively.These results show that the spectral profile reconstruction method has great application potential for expanding the dynamic range of single-line measurements to higher concentrations,especially for in-situ online measurements under complex conditions,such as over large temperature and concentration dynamic ranges.