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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

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

doi: 10.37188/CO.2023-0177
Funds:  Supported by National Natural Science Foundation of China (No. 52106221); State Key Laboratory of Applied Optics (No. SKLA02022001A05)
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  • Corresponding author: liuhaoma@whut.edu.cn
  • Received Date: 10 Oct 2023
  • Rev Recd Date: 15 Dec 2023
  • Available Online: 06 Feb 2024
  • 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.

     

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