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Sinusoidal frequency scan OFDR with fast processing algorithm for distributed acoustic sensing.

Lihi Shiloh, Avishay Eyal

    Optics Express
    |October 19, 2017
    PubMed
    Summary
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    A new, faster algorithm significantly improves sinusoidal frequency scan optical frequency domain reflectometry (SFS-OFDR) for distributed acoustic sensing (DAS). This breakthrough enables highly sensitive detection over long distances with remarkable resolution and speed.

    Area of Science:

    • Optoelectronics
    • Signal Processing
    • Fiber Optic Sensing

    Background:

    • Sinusoidal frequency scan optical frequency domain reflectometry (SFS-OFDR) shows promise for distributed acoustic sensing (DAS).
    • A key limitation of SFS-OFDR has been its computationally intensive O(N^2) data processing algorithm.
    • The generation of accurate sinusoidal frequency scans is simpler compared to linear frequency scans.

    Purpose of the Study:

    • To develop and analyze a computationally efficient algorithm for SFS-OFDR data processing.
    • To improve the performance and practicality of SFS-OFDR for distributed acoustic sensing applications.
    • To assess the sensitivity, resolution, and scan rate capabilities of the new algorithm.

    Main Methods:

    • Derivation of a novel SFS-OFDR processing algorithm with O(N log N) computational complexity.

    Related Experiment Videos

  • Detailed performance and limitation analysis of the developed algorithm.
  • Implementation and testing of the algorithm in a high-sensitivity DAS system.

    • Main Results:

    • The new algorithm reduces computational complexity from O(N^2) to O(N log N).
    • Enabled highly sensitive DAS operation over a 64km sensing fiber.
    • Achieved 6.5m spatial resolution and a 400Hz scan rate.
    • Successfully detected faint acoustic events (human footsteps) with excellent signal-to-noise ratio (SNR) in a field trial.

    Conclusions:

    • The developed O(N log N) algorithm significantly enhances the processing efficiency of SFS-OFDR.
    • This advancement makes SFS-OFDR a more viable and powerful tool for long-range, high-resolution distributed acoustic sensing.
    • The system demonstrates practical utility in real-world scenarios requiring sensitive acoustic detection.