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Laser & Optoelectronics Progress, Volume. 57, Issue 19, 190603(2020)

Extraction of Interference Signal of Weak Reflection Fiber Bragg Grating by Wavelet Transform

Peng Ding1,2, Junbin Huang2、*, Yunyun Wang2, Wen Liu2, Hongcan Gu2, and Jinsong Tang1
Author Affiliations
  • 1College of Electronic Engineering, Naval University of Engineering, Wuhan, Hubei 430033, China
  • 2Department of Weapon Engineering, Naval University of Engineering, Wuhan, Hubei 430033, China
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    AbstractGet PDF(in Chinese)
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    Diagram of WFBG sensing system and signal sequence. (a) Diagram of WFBG sensing system; (b) time sequence

    Fig. 1. Diagram of WFBG sensing system and signal sequence. (a) Diagram of WFBG sensing system; (b) time sequence

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    Interference intervals obtained based on AOM modulation signal and CWT for different modulation pulse widths and different numbers of WFBGs. (a) Interference intervals obtained based on AOM modulation signal for 300 ns modulation pulse width and 2-WFBG; (b) interference intervals obtained by CWT for 300 ns modulation pulse width and 2-WFBG; (c) interference intervals obtained by CWT for 450 ns modulation pulse width and 2-WFBG; (d) interference intervals obtained by CWT for 300 ns modulation pul

    Fig. 2. Interference intervals obtained based on AOM modulation signal and CWT for different modulation pulse widths and different numbers of WFBGs. (a) Interference intervals obtained based on AOM modulation signal for 300 ns modulation pulse width and 2-WFBG; (b) interference intervals obtained by CWT for 300 ns modulation pulse width and 2-WFBG; (c) interference intervals obtained by CWT for 450 ns modulation pulse width and 2-WFBG; (d) interference intervals obtained by CWT for 300 ns modulation pul

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    Vibration signals of vibrating liquid column obtained by multiple measurements and characteristic values of interference intervals for different modulation pulse widths under the same vibration source. (a) 300 ns modulation pulse width; (b) 450 ns modulation pulse width

    Fig. 3. Vibration signals of vibrating liquid column obtained by multiple measurements and characteristic values of interference intervals for different modulation pulse widths under the same vibration source. (a) 300 ns modulation pulse width; (b) 450 ns modulation pulse width

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    Measured signals fitted by sine curve. (a) Fitting degree; (b) frequency; (c) amplitude; (d) average fitting degree, RMSE of frequency, and mean square error of amplitude

    Fig. 4. Measured signals fitted by sine curve. (a) Fitting degree; (b) frequency; (c) amplitude; (d) average fitting degree, RMSE of frequency, and mean square error of amplitude

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    Light intensity under different modulation pulse widths. (a) 300 ns; (b) 450 ns

    Fig. 5. Light intensity under different modulation pulse widths. (a) 300 ns; (b) 450 ns

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    • Table 1. Sine curve fitting data of detected phase signals

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      Table 1. Sine curve fitting data of detected phase signals

      Test times(300 ns,maximum)R-squareAmplitude /radFrequency /HzTest times(300 ns,mean)R-squareAmplitude /radFrequency /Hz
      10.838080.89718473.4910.841890.89543501.94
      20.745025.07631481.3820.850423.75555462.64
      30.701921.07501465.1230.734160.80380511.02
      40.756760.41166527.1540.860820.50245535.79
      50.861250.63180471.8350.888270.76465472.57
      60.855791.45807464.3760.783660.98631491.92
      70.871350.65611538.7170.865370.80427536.52
      80.865340.48561541.9580.901690.60826540.56
      90.549170.56251525.0590.857240.65250473.87
      Test times(450 ns,maximum)R-squareAmplitude /radFrequency /HzTest times(450 ns,mean)R-squareAmplitude /radFrequency /Hz
      10.734961.85052504.4510.789200.95347531.62
      20.818082.19652543.4720.721392.48373523.31
      30.4961410.38246497.6330.8055010.54663459.91
      40.820905.46085445.1840.890362.97201445.53
      50.809650.96564498.3450.852191.08819525.97
      60.606721.46598456.4760.861632.10007466.14
      70.799931.61710533.5470.860960.84263477.35
      80.757140.50143516.8980.872850.56991536.64
      90.689472.05263554.5190.819280.92717499.23
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    Peng Ding, Junbin Huang, Yunyun Wang, Wen Liu, Hongcan Gu, Jinsong Tang. Extraction of Interference Signal of Weak Reflection Fiber Bragg Grating by Wavelet Transform[J]. Laser & Optoelectronics Progress, 2020, 57(19): 190603

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    Paper Information

    Category: Fiber Optics and Optical Communications

    Received: Jan. 15, 2020

    Accepted: Feb. 19, 2020

    Published Online: Sep. 23, 2020

    The Author Email: Huang Junbin (tsyj98@163.com)

    DOI:10.3788/LOP57.190603

    Topics

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