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Chinese Optics Letters, Volume. 20, Issue 1, 011202(2022)

Ultrasensitive liquid level sensor based on slice-shaped composite long period fiber grating

Xiren Jin1, Zeju Rui1, Zihang Xiang1, Chupeng Lu1, Shuo Zhang1, Xian Xu1, Mingyang Lü1, Yiwei Ma1, Cuiting Sun2, Xinghua Yang1, Tao Geng1、*, Weimin Sun1、**, and Libo Yuan3
Author Affiliations
  • 1Key Laboratory of In-fiber Integrated Optics, Ministry of Education, College of Physics and Optoelectronic Engineering, Harbin Engineering University, Harbin 150001, China
  • 2Acoustic Science and Technology Laboratory, College of Underwater Acoustic Engineering, Harbin Engineering University, Harbin 150001, China
  • 3Photonics Research Center, Guilin University of Electronics Technology, Guilin 541004, China
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    Figures&Tables (10)
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    References (32)
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    Experimental device diagram for fabricating the SSC-LPFG.

    Fig. 1. Experimental device diagram for fabricating the SSC-LPFG.

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    Scheme diagram of the SSC-LPFG fiber structure.

    Fig. 2. Scheme diagram of the SSC-LPFG fiber structure.

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    (a) Simulated energy transfer diagram. (b) Experimental and simulated transmission spectra of the SSC-LPFG structure.

    Fig. 3. (a) Simulated energy transfer diagram. (b) Experimental and simulated transmission spectra of the SSC-LPFG structure.

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    Liquid level measuring device.

    Fig. 4. Liquid level measuring device.

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    Liquid level measurement begins and ends with wavelength drift.

    Fig. 5. Liquid level measurement begins and ends with wavelength drift.

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    SSC-LPFG liquid level sensing performance at different liquid levels.

    Fig. 6. SSC-LPFG liquid level sensing performance at different liquid levels.

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    (a) Resonant dip of sensors with different polishing depths. (b) Dip wavelength shift versus liquid level (different depth of polishing).

    Fig. 7. (a) Resonant dip of sensors with different polishing depths. (b) Dip wavelength shift versus liquid level (different depth of polishing).

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    Liquid level sensing performance.

    Fig. 8. Liquid level sensing performance.

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    Response of dip wavelength to temperature changing.

    Fig. 9. Response of dip wavelength to temperature changing.

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    • Table 1. Parameter Comparison of Optical Fiber Liquid Level Sensors

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      Table 1. Parameter Comparison of Optical Fiber Liquid Level Sensors

      ConfigurationGrating Length [mm]Level Range [mm]Level Sensitivity [pm/mm]Temperature Crosstalk [μm/°C]
      SMF-MMF-HCF-SMF/FBG with aligned spliced[21]22101145 (1.333 RI)7.86
      SRI-based etched chirped FBG[22]75.612146.5
      SMF-taper-TCF-taper-SMF[23]16151241.617
      SMF-PCF-SMF with a bending cantilever setup[28]Not reported8111.27 (1.333 RI)Not reported
      SMF-PMF-SMF with waist enlarged fiber tapers[29]35282792.21
      SMF-PMF-SMF with waist enlarged fiber tapers[29]4028186Not reported
      SMF-MMF-TF-SMF with aligned spliced[30]189−175.8 (1.334 RI)350
      SMF-RCF-MMF-SMF with misaligned spliced[31]30012066533
      LLS based on a single LPFG[32]Not reported5070Not reported
      This work31.47080 (1.333 RI)3.46
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    Xiren Jin, Zeju Rui, Zihang Xiang, Chupeng Lu, Shuo Zhang, Xian Xu, Mingyang Lü, Yiwei Ma, Cuiting Sun, Xinghua Yang, Tao Geng, Weimin Sun, Libo Yuan. Ultrasensitive liquid level sensor based on slice-shaped composite long period fiber grating[J]. Chinese Optics Letters, 2022, 20(1): 011202

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    Paper Information

    Category: Instrumentation, Measurement, and Optical Sensing

    Received: Jul. 30, 2021

    Accepted: Sep. 15, 2021

    Posted: Sep. 16, 2021

    Published Online: Oct. 26, 2021

    The Author Email: Tao Geng (gengtao_hit_oe@126.com), Weimin Sun (sunweimin@hrbeu.edu.cn)

    DOI:10.3788/COL202220.011202

    Topics

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