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Laser & Optoelectronics Progress, Volume. 60, Issue 7, 0706009(2023)

Ultrasensitive Methane Volume Fraction Sensor Based on Long Period Fiber Grating and Back-Propagation Neural Network

Chao Du1、*, Bin Zhang2, Shuang Zhao1, Qiuyu Wang1, Li Zhang1, Liqin Cui1, and Xiao Deng1、**
Author Affiliations
  • 1College of Physics and Optoelectronics, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China
  • 2Military Representative Office of PLA Air Force Equipment Department in Taiyuan, Taiyuan 030006, Shanxi, China
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    AbstractGet PDF(in Chinese)
    Figures&Tables (9)
    Equations (1)
    References (25)
    Cited By (2)
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    Figures & Tables(9)
    Designed dual-layer sensing structure of LPFG

    Fig. 1. Designed dual-layer sensing structure of LPFG

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    PMCs between LP06 and LP01 for different cladding diameters

    Fig. 2. PMCs between LP06 and LP01 for different cladding diameters

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    Single-layer film structure. (a) PMCs between LP06 and LP01 under different methane volume fraction; (b) simulated transmission spectra of LPFG when methane volume fraction changes from 0% to 3.5%

    Fig. 3. Single-layer film structure. (a) PMCs between LP06 and LP01 under different methane volume fraction; (b) simulated transmission spectra of LPFG when methane volume fraction changes from 0% to 3.5%

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    Film thickness optimization. (a) Relationship between effective RI of LP06 and coated film thickness; (b) relationship between effective RI variation rate of LP06 and film thickness

    Fig. 4. Film thickness optimization. (a) Relationship between effective RI of LP06 and coated film thickness; (b) relationship between effective RI variation rate of LP06 and film thickness

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    Dual-layer thin film structures. (a) PMCs between LP06 and LP01 under different methane volume fraction; (b) simulated transmission spectra of LPFG when methane volume fraction changes from 0% to 3.5%

    Fig. 5. Dual-layer thin film structures. (a) PMCs between LP06 and LP01 under different methane volume fraction; (b) simulated transmission spectra of LPFG when methane volume fraction changes from 0% to 3.5%

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    Methane volume fraction changes from 0% to 3.5%. (a) PMCs between LP06 and LP01; (b) resonance wavelength shifts with methane volume fraction variations

    Fig. 6. Methane volume fraction changes from 0% to 3.5%. (a) PMCs between LP06 and LP01; (b) resonance wavelength shifts with methane volume fraction variations

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    Model of three-layer BP neural network

    Fig. 7. Model of three-layer BP neural network

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    Test sample prediction results. (a) Comparison of predicted and tested values; (b) prediction error of the test sample

    Fig. 8. Test sample prediction results. (a) Comparison of predicted and tested values; (b) prediction error of the test sample

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    • Table 1. Comparison of sensitivity for different methane sensor

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      Table 1. Comparison of sensitivity for different methane sensor

      ConfigurationMethane concentration range /%SensitivityReference
      Core diameter mismatch sensor0-14.50.0148［15］
      PCF sensor0-3.50.514 nm /%［8］
      0-3.51.99 nm /%［16］
      0-3.04.60 nm /%［17］
      LPFG sensor0-3.50.375 nm /%［9］
      2.5 nm /%［10］
      249.6nm /%This work
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    Chao Du, Bin Zhang, Shuang Zhao, Qiuyu Wang, Li Zhang, Liqin Cui, Xiao Deng. Ultrasensitive Methane Volume Fraction Sensor Based on Long Period Fiber Grating and Back-Propagation Neural Network[J]. Laser & Optoelectronics Progress, 2023, 60(7): 0706009

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    Paper Information

    Category: Fiber Optics and Optical Communications

    Received: Oct. 10, 2022

    Accepted: Nov. 30, 2022

    Published Online: Mar. 31, 2023

    The Author Email: Chao Du (duchao@tyut.edu.cn), Xiao Deng (dengxiao@tyut.edu.cn)

    DOI:10.3788/LOP222732

    Topics

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