Laser & Optoelectronics Progress, Volume. 57, Issue 3, 033001(2020)

Infrared Spectrum Baseline Correction Method Based on Improved Iterative Polynomial Fitting

Zhiqiang Ning1,2, Jiaxiang Liu2, Yue Wu2, Mengqi Tao2, and Yonghua Fang1,2、*
Author Affiliations
  • 1School of Environment Science and Optoelectronic Technology, University of Science and Technology of China, Hefei, Anhui 230026, China
  • 2Key Laboratory of Environmental Optics and Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei, Anhui 230031, China
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    Figures & Tables(13)
    Flow chart of improved iterative polynomial fitting method
    Simulation spectrum and the spectrum obtained with the proposed method for the first truncation of the peak
    Simulated spectrum and fitted baseline obtained with different methods
    Spectra after deducting the baseline
    RMSEs of different methods at different polynomial orders
    Original spectrum of trichloroethane and its fitted baselines obtained with different methods
    Spectra of trichloroethane after baseline correction with different methods
    Original spectrum of ammonia and its fitted baseline obtained with different methods
    Spectra of ammonia after baseline correction with different methods
    • Table 1. Simulation parameters of characteristic peak and baseline

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      Table 1. Simulation parameters of characteristic peak and baseline

      Typeabc
      11355
      2210010
      3114050
    • Table 2. RMSEs between the baseline-corrected spectrum and the original spectrum without baseline

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      Table 2. RMSEs between the baseline-corrected spectrum and the original spectrum without baseline

      MethodRMSE
      PF0.5081
      IPF0.1694
      BDM0.1258
      Proposed0.0539
    • Table 3. Mean RMSE of different methods at different polynomial orders

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      Table 3. Mean RMSE of different methods at different polynomial orders

      MethodMean RMSE
      PF0.5951
      IPF0.3492
      BDM0.3446
      Proposed0.1108
    • Table 4. Variance of signal after removing characteristic peak

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      Table 4. Variance of signal after removing characteristic peak

      MethodVariance /10-4
      TrichloroethaneAmmonia
      PF48.240
      IPF11.248
      BDM7.740
      Proposed4.539
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    Zhiqiang Ning, Jiaxiang Liu, Yue Wu, Mengqi Tao, Yonghua Fang. Infrared Spectrum Baseline Correction Method Based on Improved Iterative Polynomial Fitting[J]. Laser & Optoelectronics Progress, 2020, 57(3): 033001

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    Paper Information

    Category: Spectroscopy

    Received: Jul. 11, 2019

    Accepted: Aug. 12, 2019

    Published Online: Feb. 17, 2020

    The Author Email: Fang Yonghua (yhfang@aiofm.ac.cn)

    DOI:10.3788/LOP57.033001

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