基于外差相敏色散光谱技术的宽动态范围甲烷气体检测

周晨; 马柳昊; 王宇

doi:10.37188/CO.2023-0177

Article Contents

Chinese Optics > 2024 > Accepted Manuscript

ZHOU Chen, MA Liu-hao, WANG Yu. Measurement of methane concentration with wide dynamic range using heterodyne phase-sensitive dispersion spectroscopy[J]. Chinese Optics. doi: 10.37188/CO.2023-0177

Citation:

ZHOU Chen, MA Liu-hao, WANG Yu. Measurement of methane concentration with wide dynamic range using heterodyne phase-sensitive dispersion spectroscopy[J]. Chinese Optics. doi: 10.37188/CO.2023-0177

ZHOU Chen, MA Liu-hao, WANG Yu. Measurement of methane concentration with wide dynamic range using heterodyne phase-sensitive dispersion spectroscopy[J]. Chinese Optics. doi: 10.37188/CO.2023-0177

Citation:

ZHOU Chen, MA Liu-hao, WANG Yu. Measurement of methane concentration with wide dynamic range using heterodyne phase-sensitive dispersion spectroscopy[J]. Chinese Optics. doi: 10.37188/CO.2023-0177

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Measurement of methane concentration with wide dynamic range using heterodyne phase-sensitive dispersion spectroscopy

doi: 10.37188/CO.2023-0177

ZHOU Chen^1
,,
MA Liu-hao^{1, 2
,
,},
WANG Yu¹

1.
School of Automotive Engineering, Wuhan University of Technology, Wuhan 430070, China
2.
State Key Laboratory of Applied Optics, Changchun Institute of Optics, Precision Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China

Funds: Supported by National Natural Science Foundation of China (No. 52106221); State Key Laboratory of Applied Optics (No. SKLA02022001A05)

More Information

Corresponding author: liuhaoma@whut.edu.cn
Received Date: 10 Oct 2023
Rev Recd Date: 15 Dec 2023

Available Online: 06 Feb 2024

Abstract

Abstract

Objective
This paper describes the development of dual-sideband beat-suppressed heterodyne phase-sensitive dispersive spectroscopy (HPSDS) for sensitive detection of trace gases across a wide dynamic range, explores the operational characteristics of the electro-optic modulator, and explores bias voltage control methods under sideband suppression mode. The dispersion phase spectral profiles and the corresponding signal-to-noise ratios in both suppression and non-suppression modes were compared before a comprehensive evaluation of the detection performance.
Method
An HPSDS-based detection system was developed based on a near-infrared distributed feedback laser and an electro-optic modulator (EOM). The suppression of the dual-sideband beat was achieved by exploring and analyzing the optimal operational range of the EOM, leading to the optimization of dispersion phase signals with increased amplitude and high signal-to-noise ratio. The dispersion phase signals under typical high-frequency (1.2 GHz) intensity modulation were recorded for different standard methane/nitrogen mixtures. The relationship between the peak-to-peak values of the dispersion phase signals and the varied gas concentrations was then summarized. Meanwhile, wavelength modulation spectroscopy (WMS) experiments were conducted; subsequently, the HPSDS and WMS techniques’ performances were compared in terms of linearity, detection dynamic range, and immunity to optical power fluctuations; finally, the HPSDS-based system's performance was validated under a wide dynamic range and rapid time response was verified by measuring different concentrations of standard gases.
Result
Experimental results indicate that the HPSDS technique exhibits high linearity (R² = 0.9999), a wide dynamic range (38.5 ppm to 40%), and remarkable immunity to optical power fluctuations.
Conclusion
The dual-sideband-beat-suppression-HPSDS-based methane sensor developed in this study shows great potential for uses involving wide dynamic range detection and on-site practical trace gas detection.
- phase-sensitive detection,
- dispersion spectroscopy,
- dual-sideband beat suppression,
- methane detection,
- wide dynamic range

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References(32)

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