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Related Experiment Videos

Distributed optical fiber vibration sensor based on Sagnac interference in conjunction with OTDR.

Chao Pan, Xiaorui Liu, Hui Zhu

    Optics Express
    |October 19, 2017
    PubMed
    Summary

    A novel optical fiber vibration sensing system accurately detects single and multiple vibrations using Sagnac interference and optical time domain reflectometry (OTDR). This technology achieves precise location detection over 16 km with minimal error.

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    Area of Science:

    • Physics
    • Optical Engineering
    • Sensor Technology

    Background:

    • Distributed optical fiber sensing offers a promising method for real-time monitoring.
    • Existing methods face challenges in accurately pinpointing multiple vibration events simultaneously.

    Purpose of the Study:

    • To develop and validate a real-time distributed optical fiber vibration sensing prototype.
    • To analyze the sensing mechanism for single and multi-point vibrations.
    • To achieve accurate vibration localization with high spatial resolution.

    Main Methods:

    • Integration of Sagnac interference with optical time domain reflectometry (OTDR).
    • Theoretical analysis and experimental validation of vibration sensing mechanisms.
    • Development of a time-shifting differential module for signal processing.

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    Main Results:

    • Single-point vibrations cause abrupt, monotonous power changes in OTDR traces.
    • Multi-point vibration detection is influenced by preceding events, but distinct if separated by >0.5 pulse width.
    • Accurate vibration localization achieved by analyzing pulse peaks/valleys.
    • Position error < ±0.5 m over >16 km range with ~110 m spatial resolution.

    Conclusions:

    • The developed prototype effectively detects and locates distributed vibrations in optical fibers.
    • The system demonstrates high accuracy and spatial resolution for real-time monitoring applications.
    • This technology provides a robust solution for infrastructure monitoring and security systems.