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Polymer optical fiber twisted macro-bend coupling system for liquid level detection.

Yu-Long Hou, Wen-Yi Liu, Shan Su

    Optics Express
    |October 17, 2014
    PubMed
    Summary

    A novel liquid level detection method utilizes the cladding mode frustrated total internal reflection (CMFTIR) effect. This enhanced optical fiber sensor, using a twisted macro-bend coupling structure, offers a simpler, robust, and cost-effective solution.

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    Area of Science:

    • Optoelectronics
    • Fiber Optics Sensing
    • Material Science

    Background:

    • Traditional liquid level sensors face limitations in robustness and cost.
    • Optical fiber sensors offer potential for non-invasive and precise measurements.
    • The cladding mode frustrated total internal reflection (CMFTIR) effect presents an underexplored principle for sensing applications.

    Purpose of the Study:

    • To propose and experimentally validate a liquid level detection principle based on the CMFTIR effect.
    • To enhance the CMFTIR effect using a macro-bend coupling system for improved sensor performance.
    • To develop a simpler, more robust, and cost-effective optical fiber liquid level probe.

    Main Methods:

    • Implementation of a macro-bend coupling system with two multimode polymer optic fibers (POF).
    • Observation and utilization of the dark-field coupling phenomenon within the macro-bend structure.
    • Adoption of a twisted macro-bend coupling structure (TMBCS) for stable coupling of naked POF.

    Main Results:

    • Experimental observation of dark-field coupling between two multimode POFs.
    • Achieved a dark-field forward coupling efficiency of 2‰.
    • Demonstrated an extinction ratio of 4.18 dB for the liquid level probe.
    • The TMBCS probe exhibited superior simplicity, robustness, and cost-effectiveness compared to existing sensors.

    Conclusions:

    • The proposed CMFTIR principle, enhanced by the TMBCS, is effective for liquid level detection.
    • The TMBCS offers a stable and efficient coupling method for polymer optic fibers.
    • The developed sensor is a promising alternative to conventional liquid level sensors and has potential for other sensing applications like displacement or stress.