Photonics Research, Volume. 4, Issue 2, 0074(2016)

Wavelet modulus maxima method for on-line wavelength location of pulsed lidar in CO2 differential absorption lidar detection

Wei Gong1,2,3, Chengzhi Xiang1、*, Feiyue Mao1,2,3,4,5, Xin Ma1, and Ailin Liang1
Author Affiliations
  • 1State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University, Luoyu Road 129, Wuhan 430079, China
  • 2Collaborative Innovation Center for Geospatial Technology, Wuhan 430079, China
  • 3Hubei Collaborative Innovation Center for High-efficiency Utilization of Solar Energy, Wuhan 430068, China
  • 4School of Remote Sensing and Information Engineering, Wuhan University, Luoyu Road 129, Wuhan 430079, China
  • 5e-mail: maofeiyue@whu.edu.cn
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    Figures & Tables(21)
    Fluctuation of the dye laser emission system at around 1.6 μm region.
    Diagram of the ground-based DIAL.
    Simultaneous emission system of the dual-wavelength laser.
    Calculated absorption cross sections of CO2 and H2O according to the HITRAN 2012 database.
    Calculated absorption cross sections of the CO2 molecule at the region of R16.
    Simulated result of on-line wavelength calibration through the wavelet modulus maxima in R16.
    Simulated result of on-line wavelength calibration through quintic polynomial fitting in R16.
    Calibration result of the wavelet modulus maxima and polynomial fitting method with an SNR of 20.
    Calibration result of the wavelet modulus maxima and polynomial fitting method with an SNR of 80.
    Calibration result of the wavelet modulus maxima and polynomial fitting method with an SNR of 50.
    Calibration result of the wavelet modulus maxima and polynomial fitting method with an SNR of 30.
    Calibration result of the wavelet modulus maxima and polynomial fitting method with an SNR of 10.
    Calibration result of the wavelet modulus maxima and polynomial fitting method with an SNR of 5.
    Calibration result of the wavelet modulus maxima and polynomial fitting method with an SNR of 1.
    Wavelength control unit of the ground-based DIAL.
    Result of on-line wavelength calibration with real measured signals through the wavelet modulus maxima at the R16 region.
    • Table 1. Spectroscopic Parameters of CO2 and H2O Involved in the Simulation Analysis

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      Table 1. Spectroscopic Parameters of CO2 and H2O Involved in the Simulation Analysis

      Abbr.PositionIntensitybL(air)Enδ0(air)δ(air)PT
      C36358.654 3751.7295E230.076 5381.94010.6804.92E36.3E5101325296
      C46359.967 2861.7414E230.074 85106.12970.6724.98E38.3E5101325296
      C56361.250 3921.7026E230.073 55133.43930.6535.60E36.8E5101325296
      H16357.8813.430E260.075610.340.580.0160101325296
      H26358.8941.090E270.0742764.700.530.0175101325296
      H36360.4562.070E280.0412927.940.370.0273101325296
      H46361.4428.875E270.0171327.120.060.0120101325296
      H56361.8381.020E270.0252972.830.090.0171101325296
    • Table 2. Statistical Result of the 100 Simulated Experiments Through the Wavelet Modulus Maxima

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      Table 2. Statistical Result of the 100 Simulated Experiments Through the Wavelet Modulus Maxima

      Calibration Accuracy0.1 pm0.2 pm0.5 pm0.8 pm>0.8  pm
      No.31184461
    • Table 3. Statistical Result of the 100 Simulated Experiments Through Quintic Polynomial Fitting

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      Table 3. Statistical Result of the 100 Simulated Experiments Through Quintic Polynomial Fitting

      Calibration Accuracy0.1 pm0.2 pm0.5 pm0.8 pm>0.8  pm
      No.229272121
    • Table 4. Statistical Calibration Results of the Simulated Signals Through Two Methods with Different SNRs

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      Table 4. Statistical Calibration Results of the Simulated Signals Through Two Methods with Different SNRs

      Method SNR8050301051
      Wavelet Modulus MaximaABS(nm)1572.33631572.33641572.33651572.33661572.33671572.3367
      SD2.2851E121.5067E43.1825E44.6450E45.1508E46.1714E4
      Quintic Polynomial FittingABS(nm)1572.33681572.33681572.33681572.33691572.33721572.3373
      SD7.5201E47.4352E47.1890E48.6116E41.1728E31.3906E3
    • Table 5. Evolution of On-Line Wavelength Calibration Through the Wavelet Modulus Maxima (unit: nm)

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      Table 5. Evolution of On-Line Wavelength Calibration Through the Wavelet Modulus Maxima (unit: nm)

      12345678
      T values0.325300.322280.325410.331570.322280.325350.331630.32535
      C values0.322280.322280.327670.333170.322280.322310.329110.32223
      D values0.0030200.002260.0016000.003040.002520.00302
      910111213141516
      T values0.322280.316140.322280.319210.322280.331540.319220.32541
      C values0.319210.319210.322280.316140.319210.334610.319220.32541
      D values0.003070.0030700.003070.003070.003070.000100
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    Wei Gong, Chengzhi Xiang, Feiyue Mao, Xin Ma, Ailin Liang. Wavelet modulus maxima method for on-line wavelength location of pulsed lidar in CO2 differential absorption lidar detection[J]. Photonics Research, 2016, 4(2): 0074

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    Paper Information

    Received: Oct. 20, 2015

    Accepted: Dec. 31, 2015

    Published Online: Sep. 28, 2016

    The Author Email: Chengzhi Xiang (cxiang@whu.edu.cn)

    DOI:10.1364/prj.4.000074

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