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Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping
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Enabling long range distributed vibration sensing using multicore fiber interferometers.

Zhiyong Zhao, Li Shen, Yunli Dang

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    Summary
    This summary is machine-generated.

    A new fiber optic vibration sensor uses two interferometers in a single multicore fiber to achieve ultra-long sensing ranges. This novel system simplifies vibration detection and location determination over extended distances.

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    Area of Science:

    • Optoelectronics
    • Fiber optic sensing
    • Distributed sensing systems

    Background:

    • Traditional distributed fiber optic sensors face limitations in sensing range due to coherent Rayleigh backscattering noise.
    • Existing methods for vibration localization often require complex data processing, increasing system complexity and cost.

    Purpose of the Study:

    • To develop a novel long-range distributed fiber optic vibration sensor.
    • To overcome the limitations of coherent Rayleigh backscattering noise in fiber optic sensing.
    • To enable simple and accurate vibration location determination without complex signal processing.

    Main Methods:

    • Utilizing two counter-propagating interferometers space-division multiplexed in different cores of a seven-core fiber.
    • Employing a single laser source and forward transmitting continuous wave (CW) light.
    • Leveraging the good correlation of output temporal waveforms from spatially separated interferometers for cross-correlation analysis.

    Main Results:

    • Achieved a distributed vibration detection with an ultra-long sensing range of 38.5 km.
    • Demonstrated accurate vibration location determination with a root mean square error of approximately 54.9 m.
    • Eliminated coherent Rayleigh backscattering noise by using spatially separated interferometers.

    Conclusions:

    • The proposed fiber optic vibration sensor offers a simple setup, high sensitivity, and a large dynamic range.
    • The system enables significantly extended sensing ranges compared to conventional methods.
    • Direct vibration location determination via cross-correlation simplifies the overall system and data analysis.