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Quasi-distributed fiber-optic acoustic sensor based on a low coherence light source.

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    This study introduces a novel quasi-distributed acoustic sensor. It effectively detects dynamic strain using weak reflectors and a low coherence light source with high resolution and no crosstalk.

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    Area of Science:

    • Optoelectronics
    • Fiber Optic Sensing
    • Photonics

    Background:

    • Distributed acoustic sensing (DAS) is crucial for monitoring.
    • Existing DAS systems face limitations in cost and complexity.
    • A need exists for simpler, cost-effective quasi-distributed sensing solutions.

    Purpose of the Study:

    • To present a new quasi-distributed acoustic sensing (QDAS) system.
    • To demonstrate dynamic strain retrieval using in-line weak reflectors.
    • To evaluate the system's performance in terms of resolution and crosstalk.

    Main Methods:

    • Utilizing a low coherence light source.
    • Employing in-line weak reflectors for light beam reflection.
    • Analyzing phase changes of interfering light beams to retrieve dynamic strain.
    • Implementing a quasi-distributed configuration with an array of reflectors.

    Main Results:

    • Successful simultaneous detection of two distinct vibrations.
    • Achieved a strain resolution of 50 pɛ/Hz over a 20-m interval.
    • Demonstrated no crosstalk between sensing channels.
    • Validated the system's capability for quasi-distributed acoustic sensing.

    Conclusions:

    • The presented QDAS system offers a simple and low-cost solution.
    • This approach represents a novel method for quasi-distributed acoustic sensing.
    • The system shows potential for various monitoring applications requiring high strain resolution.