1 School of Electric Power, South China University of Technology, Guangzhou 510640, China; 2 Key Laboratory of Environmental Optics and Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Anhui 230031, China
Abstract 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.
Fund: Project supported by the Guangdong Province Key Laboratory of Efficient and Clean Energy Utilization (Grant No. 2013A061401005) and the Key Laboratory of Efficient and Clean Energy Utilization of Guangdong Higher Education Institutes (Grant No. KLB10004).
Wei Nie(聂伟), Zhen-Yu Xu(许振宇), Rui-Feng Kan(阚瑞峰), Mei-Rong Dong(董美蓉), and Ji-Dong Lu(陆继东) An approach to gas sensors based on tunable diode laser incomplete saturated absorption spectra 2021 Chin. Phys. B 30 064213
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