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Time-expanded φOTDR using low-frequency electronics.

Miguel Soriano-Amat, Hugo F Martins, Sonia Martin-Lopez

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    |February 14, 2023
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    Summary
    This summary is machine-generated.

    Time expanded phase-sensitive optical time-domain reflectometry (TE-φOTDR) now uses low-frequency electronics for simpler, cheaper distributed fiber sensing. This advancement enables high-resolution acoustic and strain sensing for field applications like structural health monitoring.

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    Area of Science:

    • Photonics and Optical Sensing
    • Fiber Optic Technologies
    • Distributed Sensing Systems

    Background:

    • Phase-sensitive optical time-domain reflectometry (φOTDR) is a key technology for distributed fiber sensing.
    • Existing TE-φOTDR methods often require complex, high-frequency electronics and decoding algorithms.
    • There is a need for simpler, more cost-effective, and field-deployable distributed sensing solutions.

    Purpose of the Study:

    • To demonstrate a simplified TE-φOTDR system using low-frequency electronics.
    • To achieve high-resolution distributed sensing without complex coding or specialized fibers.
    • To validate the system's performance for strain sensing and potential field applications.

    Main Methods:

    • Utilized two mutually coherent optical frequency combs for TE-φOTDR.
    • Employed electro-optic comb generators driven by low-frequency radio signals (via step recovery diodes).
    • Performed distributed strain sensing experiments over a 20-meter fiber optic cable.

    Main Results:

    • Successfully realized TE-φOTDR with low-frequency electronics for signal generation and detection.
    • Achieved centimeter-level spatial resolution (3 cm) with a high acoustic sampling rate (up to 200 Hz).
    • Demonstrated a compact, low-cost sensor system that operates without decoding algorithms.

    Conclusions:

    • The proposed low-frequency TE-φOTDR approach offers a simplified and cost-effective solution for distributed fiber sensing.
    • The system's high resolution and performance make it suitable for practical field applications, such as structural health monitoring.
    • This advancement paves the way for wider adoption of advanced distributed sensing technologies.