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    Area of Science:

    • Optical Sensing
    • Fiber Optics
    • Metrology

    Background:

    • Multi-channel Fabry-Perot (F-P) sensing systems face challenges with channel adaptability.
    • Accurate demodulation is crucial for reliable sensor data interpretation.

    Purpose of the Study:

    • To propose a position-deviation-compensation demodulation method.
    • To enhance the channel adaptability of F-P sensors in multi-channel optical fiber systems.

    Main Methods:

    • Combined envelope peak position (EPP) retrieval using phase information for high-precision EPP recovery.
    • Position compensation using an optical-path-based model to address inter-channel position deviations.

    Main Results:

    • The proposed method enables accurate demodulation of F-P sensors across all channels.
    • Pressure experiments demonstrated demodulation errors of no more than 0.13 kPa for all channels.

    Conclusions:

    • The developed position-deviation-compensation method is effective and reliable.
    • This approach significantly improves the channel adaptability of F-P sensors in multi-channel sensing systems.