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Long-range distributed vibration sensing using phase-sensitive forward optical transmission.

George Y Chen, Kuan Liu, Xing Rao

    Optics Letters
    |September 14, 2023
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a novel fiber-optic vibration sensor for long-range structural health monitoring. The system achieves up to 80 km sensing range with precise vibration positioning, enhancing real-time monitoring capabilities.

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    Area of Science:

    • Optoelectronics
    • Sensor Technology
    • Structural Health Monitoring

    Background:

    • Real-time structural health monitoring relies on effective vibration sensing.
    • Existing distributed fiber-optic sensors face limitations in range and complexity.

    Purpose of the Study:

    • To introduce and demonstrate a novel distributed fiber-optic vibration sensor.
    • To achieve long-range sensing capabilities with simplified laser sources and accurate positioning.

    Main Methods:

    • Utilized forward light transmission for sensing and a self-interference method for laser simplification.
    • Employed two Mach-Zehnder interferometers (MZIs) with a 3x3 coupler-based differential cross multiplication algorithm for phase calculation.
    • Implemented a folded double-ended detection configuration with cross-correlation (CC) for vibration positioning based on time-of-flight differences.

    Main Results:

    • Demonstrated a long-range sensing capability of approximately 80 km without optical amplification.
    • Achieved a vibration position accuracy of 336 meters.
    • Successfully extracted vibration information through phase modulation analysis.

    Conclusions:

    • The proposed fiber-optic vibration sensor offers a significant advancement in long-range structural health monitoring.
    • The system's design simplifies laser sources while maintaining high sensing and positioning accuracy.
    • This technology holds promise for enhanced real-time monitoring of large-scale structures.