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 聂伟;许振宇;阚瑞峰;董美蓉;陆继东

作者机构：School of Electric PowerSouth China University of TechnologyGuangzhou 510640China Key Laboratory of Environmental Optics and TechnologyAnhui Institute of Optics and Fine MechanicsChinese Academy of SciencesAnhui 230031China 

出 版 物：《Chinese Physics B》 (中国物理B（英文版）)

年 卷 期：2021年第30卷第6期

页      面：365-372页

核心收录：

学科分类：080202[工学-机械电子工程] 08[工学] 0802[工学-机械工程] 

基　　金：supported by the Guangdong Province Key Laboratory of Efficient and Clean Energy Utilization (Grant No. 2013A061401005) the Key Laboratory of Efficient and Clean Energy Utilization of Guangdong Higher Education Institutes (Grant No. KLB10004) 

主　　题：absorption saturation spectral profile reconstruction TDLAS pressure self-broadened half-width coefficient 

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 wholeprofile 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 saturatedabsorption 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.