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Compact optical fiber sensor based on Vernier effect with speckle patterns.

Fang Zhao, Weihao Lin, Penglai Guo

    Optics Express
    |November 29, 2023
    PubMed
    Summary
    This summary is machine-generated.

    A novel Vernier effect sensor accurately measures temperature and salinity using speckle patterns. This compact, low-cost device offers high sensitivity for marine and industrial applications.

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    Area of Science:

    • Optical sensing
    • Fiber optics
    • Interferometry

    Background:

    • Accurate temperature and salinity monitoring is crucial for marine and industrial processes.
    • Existing sensors may face challenges with measurement consistency and cost.

    Purpose of the Study:

    • To develop and validate a Vernier effect-based sensor for simultaneous temperature and salinity measurements.
    • To leverage correlation speckle patterns for enhanced sensing capabilities.

    Main Methods:

    • Constructed a sensor using two series-connected Fabry Perot interferometers (FPIs) with hole core fiber (HCF) and erbium-doped fiber (EDF).
    • Employed speckle demodulation and Zero-means normalized cross-correlation (ZNCC) for data analysis.
    • Validated sensor performance through experimental testing.

    Main Results:

    • Demonstrated a linear relationship between ZNCC values and temperature/salinity.
    • Achieved a temperature sensitivity of -0.0224 /°C and salinity sensitivity of -0.0439/%.
    • Confirmed the sensor's compact size, low cost, high sensitivity, and stability.

    Conclusions:

    • The proposed Vernier effect sensor effectively measures temperature and salinity with high accuracy.
    • The sensor's advantageous features make it suitable for diverse environmental and industrial monitoring applications.
    • This technology holds significant potential for simultaneous parameter measurement in critical settings.