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Laser & Optoelectronics Progress, Volume. 62, Issue 17, 1730002(2025)

NO Concentration Inversion Method Based on EWT-ASG and LSTM Neural Network

Yang Lu1, Yujun Zhang2、*, Boqiang Fan2, Kun You2, and Ying He2
Author Affiliations
  • 1Institutes of Physical Science and Information Technology, Anhui University, Hefei 230601, Anhui , China
  • 2Anhui Institute of Optics and Fine Mechanics, HFIPS, Chinese Academy of Sciences, Hefei 230031, Anhui , China
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    AbstractGet PDF(in Chinese)
    Figures&Tables (10)
    Equations (12)
    References (17)
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    Figures & Tables(10)
    Partitioning of Fourier axis

    Fig. 1. Partitioning of Fourier axis

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    LSTM structure diagram

    Fig. 2. LSTM structure diagram

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    LSTM model inversion process

    Fig. 3. LSTM model inversion process

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    Schematic diagram of measurement system

    Fig. 4. Schematic diagram of measurement system

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    Spectral signal preprocessing

    Fig. 5. Spectral signal preprocessing

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    Spectral signal processing. (a) EWT decomposition results; (b) ASG filtering results; (c) reconstructed signal

    Fig. 6. Spectral signal processing. (a) EWT decomposition results; (b) ASG filtering results; (c) reconstructed signal

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    Comparison of NO inversion results. (a) Linear fitting of LSTM direct inversion results; (b) linear fitting of EWT-ASG inversion results; (c) linear fitting of DOAS inversion results; (d)(e)(f) inversion errors

    Fig. 7. Comparison of NO inversion results. (a) Linear fitting of LSTM direct inversion results; (b) linear fitting of EWT-ASG inversion results; (c) linear fitting of DOAS inversion results; (d)(e)(f) inversion errors

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    • Table 1. Partial parameters of deuterium lamp

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      Table 1. Partial parameters of deuterium lamp

      ParameterValue
      Readable wavelength range /nm190-400
      Size /mm×mm×mm100×205×180
      Stability at 250 nm /%<0.005
      Out power /W25
      Lamp source life /h1000

    • Table 2. Partial parameters of spectrometer

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      Table 2. Partial parameters of spectrometer

      ParameterValue
      Readable wavelength range /nm198.6-433.8
      Optical resolution /nm1.5
      Number of pixels3648

      Sample interval /nm

      Diaphragm

      0.07

      10

    • Table 3. Signal-to-noise ratio comparison

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      Table 3. Signal-to-noise ratio comparison

      Model60×10-670×10-680×10-690×10-6100×10-6
      SNR4.50223.59022.62963.39683.8682
      SNR_db45.90324.70684.20973.94013.8689
      SNR_sym54.76364.92554.22004.01864.6639
      SNR_sym45.13173.62603.49873.47764.2574
      SNR_EWT5.30774.18263.59463.82883.8399
      SNR_EWT-ASG7.287810.28615.20025.27537.4949
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    Yang Lu, Yujun Zhang, Boqiang Fan, Kun You, Ying He. NO Concentration Inversion Method Based on EWT-ASG and LSTM Neural Network[J]. Laser & Optoelectronics Progress, 2025, 62(17): 1730002

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    Paper Information

    Category: Spectroscopy

    Received: Dec. 26, 2024

    Accepted: Feb. 19, 2025

    Published Online: Aug. 11, 2025

    The Author Email: Yujun Zhang (yjzhang@aiofm.ac.cn)

    DOI:10.3788/LOP242508

    CSTR:32186.14.LOP242508

    Topics

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