Near-Infrared Dual-Range Methane Sensor Using the OAIC-HC Mode Based on VMD-SG-Assisted Optical Noise Suppression

Based on tunable diode laser absorption spectroscopy and off-axis integrated cavity output spectroscopy, a dual-range methane hybrid sensor was constructed utilizing the overtone absorption band of CH4 gas molecules at 1653.7 nm. By simultaneously utilizing an off-axis integrated cavity and Herriott...

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Bibliographic Details
Published in:Analytical chemistry (Washington) 2024-10, Vol.96 (42), p.16891-16899
Main Authors: Li, Guolin, Zhang, Siyu, Liu, Yajing, Dong, Enting, Jia, Lupeng, Zhao, Fuli, Zhao, Yingjie, Li, Longju, Yuan, Haoran, Cui, Guangzhao, Sun, Ruixiang
Format: Article
Language:English
Subjects:
absorption
Absorption spectra
Absorption spectroscopy
Algorithms
analytical chemistry
Correlation coefficient
Correlation coefficients
detection limit
diodes
Environmental quality
Global optimization
Methane
Near infrared radiation
Noise reduction
Optical noise
Photoelectricity
Semiconductor lasers
Sensors
sensors (equipment)
spectroscopy
Spectrum analysis
standard deviation
Tunable lasers
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Summary:Based on tunable diode laser absorption spectroscopy and off-axis integrated cavity output spectroscopy, a dual-range methane hybrid sensor was constructed utilizing the overtone absorption band of CH4 gas molecules at 1653.7 nm. By simultaneously utilizing an off-axis integrated cavity and Herriott cell with an effective absorption path of 11 and 405 m, respectively, the two received photoelectric signals are decomposed into different frequency components by VMD and then reconstructed after SG filtering. Applying the global optimization algorithm DA-ELM to CH4 concentration inversion, the correlation coefficient R 2 is as high as 0.9995. Through long-term stability verification, the instrument’s standard deviation at 1 ppm is 27 ppb. After Allan–Werle deviation analysis, the sensor’s limit of detection is 2.298 ppb at an integration time of 138 s. Using the self-developed sensor, the detection of dual-range trace CH4 gas is achieved, enabling a dynamic detection range of trace CH4 gas ranging from 400 ppb to 1000 ppm. The sensor realizes dual-range methane trace detection and actively controls methane emissions to improve environmental quality while taking into account the safety benefits of reducing production accidents.
ISSN:0003-2700
1520-6882
1520-6882
DOI:10.1021/acs.analchem.4c03771