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Chinese Optics Letters, Volume. 21, Issue 1, 011202(2023)

Preliminary study on direct measurements and diagnostics for chemical reaction dynamics of NOx by using laser wavelength modulation spectroscopy

Yongjian Li1, Shuai Zhang1, Jinyi Li2, Xiaotao Yang3, Yunfei Meng1, Xu Liu1, and Zhenhui Du1、*
Author Affiliations
  • 1State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin 300072, China
  • 2Tianjin Key Laboratory of Intelligent Control of Electrical Equipment, Tiangong University, Tianjin 300387, China
  • 3College of Power and Energy Engineering, Harbin Engineering University, Harbin 150001, China
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    Schematic diagram of the experimental system: (a) NOx measurement modulation waveform; (b) O2 measurement modulation waveform; (c) WMS-2f/1f signal of demodulated O2 absorption spectra; (d) WMS-2f/1f signal of demodulated NO and NO2 absorption spectra.

    Fig. 1. Schematic diagram of the experimental system: (a) NOx measurement modulation waveform; (b) O2 measurement modulation waveform; (c) WMS-2f/1f signal of demodulated O2 absorption spectra; (d) WMS-2f/1f signal of demodulated NO and NO2 absorption spectra.

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    Fitting results and residuals of WMS-2f/1f for NO2, NO, and O2 absorption spectra: (a) 0.14% relative root mean square (RMS) for the NO2 spectra; (b) 0.17% relative RMS for the NO spectra; (c) 0.21% relative RMS for the O2 spectra.

    Fig. 2. Fitting results and residuals of WMS-2f/1f for NO2, NO, and O2 absorption spectra: (a) 0.14% relative root mean square (RMS) for the NO2 spectra; (b) 0.17% relative RMS for the NO spectra; (c) 0.21% relative RMS for the O2 spectra.

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    Measurement results of O3 oxidizing NO reaction process: (a) temperature; (b) pressure; (c) NO2 concentration; (d) NO concentration; (e) O2 concentration; (f) O3 concentration; (g) denitrification rate.

    Fig. 3. Measurement results of O3 oxidizing NO reaction process: (a) temperature; (b) pressure; (c) NO2 concentration; (d) NO concentration; (e) O2 concentration; (f) O3 concentration; (g) denitrification rate.

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    • Table 1. Experimental System Configuration Parameters

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      Table 1. Experimental System Configuration Parameters

      GasLaserMeasurement MethodWavenumber (cm−1)Detection Sensitivity (mol/L)
      O2DBR, PhotodigmWMS-2f/1f13142.66.13×10−6
      NO2QCL, HamamatsuWMS-2f/1f1629.854.91×10−6
      1630.33
      NOQCL, HamamatsuWMS-2f/1f1900.071.06×10−5
      O3Electrochemical–4.09×10−6
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    Yongjian Li, Shuai Zhang, Jinyi Li, Xiaotao Yang, Yunfei Meng, Xu Liu, Zhenhui Du. Preliminary study on direct measurements and diagnostics for chemical reaction dynamics of NOx by using laser wavelength modulation spectroscopy[J]. Chinese Optics Letters, 2023, 21(1): 011202

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    Paper Information

    Category: Instrumentation, Measurement, and Optical Sensing

    Received: May. 3, 2022

    Accepted: Aug. 4, 2022

    Published Online: Sep. 8, 2022

    The Author Email: Zhenhui Du (duzhenhui@tju.edu.cn)

    DOI:10.3788/COL202321.011202

    Topics

    laser devices and laser physics
    Lasers and Laser Optics
    Laser physics
    laser manufacturing
    Instrumentation, Measurement and Metrology