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Fiber optic interferometric seismometer with phase feedback control.

Tianying Chang, Zhongmin Wang, Yue Yang

    Optics Express
    |April 1, 2020
    PubMed
    Summary
    This summary is machine-generated.

    A novel fiber optic seismometer utilizes phase feedback control to significantly enhance sensitivity for ultralow-frequency vibration detection. This advancement allows for the clear observation of faint seismic signals previously obscured by noise.

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    Area of Science:

    • * Physics and Engineering
    • * Optoelectronics and Sensor Technology

    Background:

    • * Traditional seismometers face limitations in detecting ultralow-frequency vibrations.
    • * Fiber optic interferometers offer potential for high-sensitivity measurements.
    • * Feedback control is a promising strategy for enhancing sensor performance.

    Purpose of the Study:

    • * To propose and demonstrate a high-sensitivity ultralow-frequency fiber optic interferometric seismometer.
    • * To analyze the impact of phase feedback control on seismic sensing capabilities.
    • * To improve the detection of weak vibration signals buried in noise.

    Main Methods:

    • * Development and implementation of a phase feedback control loop for a Michelson interferometer.
    • * Analysis of the seismometer's amplitude and phase response with and without feedback.
    • * Experimental validation of the enhanced sensitivity for ultralow-frequency vibrations.

    Main Results:

    • * The phase feedback control loop successfully increased the seismometer's sensitivity at ultralow frequencies.
    • * Experimental results demonstrated unambiguous observation of weak vibration signals.
    • * The system effectively distinguished faint seismic signals from background noise.

    Conclusions:

    • * Phase feedback control is an effective method for enhancing the sensitivity of fiber optic interferometric seismometers.
    • * The developed seismometer demonstrates superior performance in detecting ultralow-frequency vibrations.
    • * This technology has significant implications for seismic monitoring and research.