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Highly sensitive fiber-optic accelerometer using a micro suspended-core fiber.

Wen Wang, Yedi Shen, Teng Guo

    Applied Optics
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    Summary
    This summary is machine-generated.

    This study presents a compact fiber-optic accelerometer using Fabry-Perot interference (FPI). The novel design achieves high sensitivity to axial vibrations for vibration detection.

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    Area of Science:

    • Optoelectronics
    • Fiber Optics
    • Sensor Technology

    Background:

    • Traditional accelerometers face limitations in harsh environments.
    • Fiber-optic sensors offer advantages in electromagnetic immunity and miniaturization.

    Purpose of the Study:

    • To propose and experimentally demonstrate a compact fiber-optic accelerometer.
    • To leverage Fabry-Perot interference (FPI) for vibration sensing.
    • To achieve high sensitivity and a broad frequency band.

    Main Methods:

    • Constructing a sensor head with suspended-core fiber in hollow-core fiber for an enclosed cavity.
    • Utilizing a multi-mode fiber (MMF) as a micro-lens to reduce transmission loss.
    • Forming a low-finesse Fabry-Perot interferometer (FPI) using fiber end-faces.
    • Employing a one-dimensional mechanical transducer to enhance the sensor's frequency response.
    • Implementing side-band filtering and intensity interrogation for vibration analysis.

    Main Results:

    • A compact fiber-optic accelerometer based on FPI was successfully demonstrated.
    • The sensor exhibited high sensitivity to vibration along the fiber axis due to the extended FPI cavity.
    • The integration of a mechanical transducer and side-band filtering improved the sensor's frequency band.
    • Simple intensity interrogation was sufficient for vibration detection and analysis.

    Conclusions:

    • The proposed fiber-optic accelerometer offers a sensitive and compact solution for vibration measurement.
    • The design utilizing suspended-core fiber and FPI is effective for axial vibration detection.
    • The sensor demonstrates potential for various applications requiring robust and miniaturized vibration sensing.