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ORIGINAL RESEARCH article
Front. Phys.
Sec. Optics and Photonics
Volume 13 - 2025 | doi: 10.3389/fphy.2025.1573242
A High Accuracy Measurement of CH 4 and CO 2 Using System State Parameter Equivalence Correction Method
Provisionally accepted- 1 State Key Laboratory of Black Soils Conservation and Utilization, Northeast Institute of Geography and Agroecology, Changchun, China
- 2 Jilin Vocational and Technical College of Transportation, Changchun, China
- 3 Jilin Yumai Aviation Co., Ltd., Changchun, China
- 4 Henghui Optoelectronic Measurement Technology (Jilin) Co., Ltd., Changchun, Changchun, China
- 5 College of Instrumentation and Electrical Engineering, Jilin University, Changchun, Hebei Province, China
To enable to achieve high performance measurement of CH4 and CO2 gases in the field environment, a measuring system using infrared tunable diode laser absorption spectroscopy (TDLAS) technology was proposed in this paper. The measuring system adopted an infrared compact-linear optical structure, including two infrared distributed feedback (DFB) lasers (central wavelength at 2325 nm and 2004 nm, respectively), long optical path multi-pass cell (effective optical path is 41.5 m) and photoelectric detectors (response wavelength is from 900 nm to 2600 nm). Combining system state parameter equivalence correction (SSPEC) method to eliminate of measuring system error. The experimental results show that the minimum detection limit (MDL) of CH4 and CO2 are 0.29 ppmv@29s and 6.5 ppmv@17s, the measurement uncertainty is 2.4 ‰ and 2.5 ‰ with 98% confidence interval, the maximum measurement errors are 2.3 ‰ and 2.5 ‰ . Finally, the environmental adaptability test was carried out in the seismic station of Jilin Province, P.R. China.
Keywords: measurement of CH4 and CO2, TDLAS technology, SSPEC method, elimination of measuring system error, Environmental adaptability test
Received: 08 Feb 2025; Accepted: 12 Mar 2025.
Copyright: © 2025 Liu, Li, Chen, Du, Lu and Chen. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
* Correspondence:
Jiayuan Chen, Jilin Vocational and Technical College of Transportation, Changchun, China
Chen Chen, College of Instrumentation and Electrical Engineering, Jilin University, Changchun, 130061, Hebei Province, China
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