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Liquid-level sensing based on a hollow core Bragg fiber.

Yu Wang, Guofeng Yan, Zhenggang Lian

    Optics Express
    |August 23, 2018
    PubMed
    Summary

    A new optical fiber sensor using hollow core Bragg fiber (HCBF) accurately measures liquid levels. This innovative sensor offers high sensitivity and fast response times for reliable liquid level detection.

    Area of Science:

    • Photonics
    • Optical Sensing
    • Fiber Optics

    Background:

    • Accurate liquid level monitoring is crucial in various industrial and scientific applications.
    • Traditional sensors face limitations in harsh environments or with specific liquid properties.
    • Optical fiber sensors offer advantages like immunity to electromagnetic interference and remote sensing capabilities.

    Purpose of the Study:

    • To propose and demonstrate a novel optical fiber liquid level sensor.
    • To utilize a hollow core Bragg fiber (HCBF) for enhanced sensing performance.
    • To evaluate the sensor's sensitivity, response time, and cross-sensitivity to environmental factors.

    Main Methods:

    • Design and fabrication of a hollow core Bragg fiber (HCBF) with a periodic transmission band.

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  • Construction of an inline fiber optic sensor by integrating the HCBF between two single mode fibers.
  • Experimental testing of the sensor's performance using intensity demodulation.

    • Main Results:

    • Successful fabrication of HCBF with a transmission loss of ~3.48 dB/cm.
    • Achieved a linear liquid-level sensitivity of approximately 1.1 dB/mm.
    • Demonstrated a fast response time of less than 3 seconds.
    • Investigated and confirmed minimal dependence on temperature and refractive index variations.

    Conclusions:

    • The proposed HCBF-based optical fiber sensor is effective for liquid level measurement.
    • The sensor exhibits high sensitivity and rapid response, suitable for real-time monitoring.
    • Low cross-sensitivity to temperature and refractive index makes it a versatile platform for diverse liquid sensing applications.