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Laser source frequency drift compensation in Φ-OTDR systems using multiple probe frequencies.

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    This study introduces a novel method for phase sensitive optical time domain reflectometry (Φ-OTDR) systems by adding a reference frequency. This innovation combats low-frequency noise, improving seismic wave detection accuracy in geophysical applications.

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    Area of Science:

    • Geophysics
    • Optical Sensing
    • Signal Processing

    Background:

    • Phase sensitive optical time domain reflectometry (Φ-OTDR) is valuable for geophysical applications due to its cost-efficiency and accuracy.
    • Laser frequency drifts in Φ-OTDR systems introduce low-frequency noise, compromising data accuracy for seismic wave analysis.

    Purpose of the Study:

    • To propose a method to mitigate low-frequency noise in Φ-OTDR systems.
    • To enhance the accuracy of seismic wave detection by providing a reference frequency.

    Main Methods:

    • Implementing an additional probe frequency within the Φ-OTDR setup.
    • Utilizing the reference frequency to monitor laser source changes and environmental noise (humidity, temperature).

    Main Results:

    • The proposed reference frequency effectively identifies and helps correct for laser source drifts and environmental noise.
    • Improved data accuracy, particularly for low-frequency seismic waves and near DC band analysis.

    Conclusions:

    • The novel reference frequency method enhances the reliability and accuracy of Φ-OTDR systems.
    • This adaptable technique can be integrated into various commercial Φ-OTDR devices for improved geophysical sensing.