Method for demodulating the overlapping absorption spectra of CO and CH4

Author:

Zhao Xiaohu12ORCID,Sun Pengshai,Zhang Zhirong134,Wang Qianjin1,Wu Bian,Pang Tao,Xia Hua,Guo Qiang,Sun Miao2

Affiliation:

1. University of Science and Technology of China

2. Hefei Normal University

3. Anhui Institute of Optics and Fine Mechanics

4. Advanced Laser Technology Laboratory of Anhui Province

Abstract

When measuring the concentrations of individual gases in gas mixtures via laser absorption spectroscopy, the widening of adjacent absorption spectral lines can cause them to overlap, which hinders the calculation of the gas concentrations. In this study, the causes of this hindrance are analyzed. By using the Partial Least Squares (PLS) algorithm, the relative error in the measured CO concentration for a mixture of CO and CH4 gases was less than 10% even when the volume ratio VCH4/CO (The ratio of CH4 gas concentration to CO gas concentration) reached 100. These results show that the PLS algorithm is able to determine accurate concentrations even with significant broadening and interference of spectral lines in mixed gases.

Funder

Key Research and Development Plan of Anhui Province

National Key Research and Development Program of China

National Natural Science Foundation of China

"Spark" Fund Project of Hefei Institutes of Physics Science, Chinese Academy Sciences, China

Key Projects of Natural Science Research in Colleges and Universities in Anhui Province, China

Key Projects of Anhui Province Key Laboratory of Simulation and Design for Electronic Information System

CAS & Bengbu Technology Transfer Project

Publisher

Optica Publishing Group

Subject

Atomic and Molecular Physics, and Optics

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