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Laser & Optoelectronics Progress, Volume. 59, Issue 21, 2106002(2022)

Structural Monitoring Performance of Optical Frequency Domain Reflectometry and Ultra-Weak Fiber Bragg Grating Technologies

Zichao Wang1,2, Zhiang Liu1,2、*, and Huadong Yang1,2
Author Affiliations
  • 1CCCC Second Harbor Engineering Co., Ltd., Wuhan 430040, Hubei, China
  • 2Key Laboratory of Transportation Sector for Long-Span Bridge Construction Technique, Wuhan 430040, Hubei, China
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    AbstractGet PDF(in Chinese)
    Figures&Tables (16)
    Equations (9)
    References (17)
    Cited By (2)
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    Paper Information
    Topics
    Figures & Tables(16)
    Sensing principle of the OFDR

    Fig. 1. Sensing principle of the OFDR

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    Sensing principle of the UWFBG

    Fig. 2. Sensing principle of the UWFBG

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    Experimental model. (a) Schematic diagram; (b) physical map

    Fig. 3. Experimental model. (a) Schematic diagram; (b) physical map

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    Schematic diagram of optical fiber installation

    Fig. 4. Schematic diagram of optical fiber installation

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    Layout of strain gauges

    Fig. 5. Layout of strain gauges

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    Strain test distribution of OFDR. (a) No. 1 optical fiber (condition 1); (b) No. 2 optical fiber (condition 1); (c) No. 1 optical fiber (condition 2); (d) No. 2 optical fiber (condition 2)

    Fig. 6. Strain test distribution of OFDR. (a) No. 1 optical fiber (condition 1); (b) No. 2 optical fiber (condition 1); (c) No. 1 optical fiber (condition 2); (d) No. 2 optical fiber (condition 2)

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    Strain test distribution of UWFBG. (a) No. 3 optical fiber (condition 1); (b) No. 4 optical fiber (condition 1); (c) No. 3 optical fiber (condition 2); (d) No. 4 optical fiber (condition 2)

    Fig. 7. Strain test distribution of UWFBG. (a) No. 3 optical fiber (condition 1); (b) No. 4 optical fiber (condition 1); (c) No. 3 optical fiber (condition 2); (d) No. 4 optical fiber (condition 2)

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    Schematic diagram of improving spatial resolution

    Fig. 8. Schematic diagram of improving spatial resolution

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    Interpolation diagram of No. 4 fiber

    Fig. 9. Interpolation diagram of No. 4 fiber

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    Theoretical strain,OFDR measured value and UWFBG measured value of the beam in elastic working stage

    Fig. 10. Theoretical strain,OFDR measured value and UWFBG measured value of the beam in elastic working stage

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    Measured values of mid span optical fiber and strain gauge

    Fig. 11. Measured values of mid span optical fiber and strain gauge

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    • Table 1. Technical parameters of demodulation equipment

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      Table 1. Technical parameters of demodulation equipment

      NameOFDRUWFBG
      Sensing length /m1001000
      Spatial resolution /mm1300
      Measuring range /με1200015000
      Strain accuracy /με11
      Temperature accuracy /℃0.10.1
      Sampling rate50 Hz@20 m， 20 Hz@50 m1 Hz@1 km

    • Table 2. Types of optical fibers

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      Table 2. Types of optical fibers

      No.EquipmentCharacteristicDiameter /mm
      1OFDRstrain sensing fiber0.25
      2tight buffer strain sensing fiber0.90
      3UWFBGstrain sensing fiber0.25
      4tight buffer strain sensing fiber0.90

    • Table 3. Specific parameters of different working conditions

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      Table 3. Specific parameters of different working conditions

      Working conditionStep by step loading and unloading
      Condition 1heavy load， 10-100 kN， 100-10 kN （10 kN each level）
      Condition 2light load， 1-7 kN， 7-1 kN （1 kN each level）

    • Table 4. Pearson correlation coefficient

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      Table 4. Pearson correlation coefficient

      LocationNo.1No.2No.3No.4Strain gauge
      At the 1/3 of beam0.99940.99930.99920.99920.9990
      At the mid of beam0.99900.99920.99980.99970.9995
      At the 2/3 of beam0.99920.99940.99990.99990.9998

    • Table 5. Measured values of midspan fiber and strain gauge

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      Table 5. Measured values of midspan fiber and strain gauge

      No.1234
      Condition 1Precision /με3322
      Accuracy /%98989898
      Condition 2Precision /με2211
      Accuracy /%84829697
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    Zichao Wang, Zhiang Liu, Huadong Yang. Structural Monitoring Performance of Optical Frequency Domain Reflectometry and Ultra-Weak Fiber Bragg Grating Technologies[J]. Laser & Optoelectronics Progress, 2022, 59(21): 2106002

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    Paper Information

    Category: Fiber Optics and Optical Communications

    Received: Oct. 9, 2021

    Accepted: Nov. 5, 2021

    Published Online: Oct. 24, 2022

    The Author Email: Zhiang Liu (kawhigo@foxmail.com)

    DOI:10.3788/LOP202259.2106002

    Topics

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