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Two-dimensional vector accelerometer based on Bragg gratings inscribed in a multi-core fiber.

Jingxian Cui, Zhengyong Liu, Dinusha Serandi Gunawardena

    Optics Express
    |September 13, 2019
    PubMed
    Summary

    This study introduces a new fiber Bragg grating accelerometer that measures vibration orientation and acceleration simultaneously. This novel sensor offers high orientation accuracy and potential for industrial dynamic monitoring.

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    Area of Science:

    • Photonics and Sensing Technologies
    • Materials Science and Engineering
    • Mechanical Engineering and Dynamics

    Background:

    • Traditional accelerometers often lack multi-dimensional sensing capabilities.
    • Fiber optic sensors offer advantages in harsh environments and remote sensing.
    • Developing compact, integrated sensors for simultaneous vibration and orientation measurement is crucial for advanced monitoring.

    Purpose of the Study:

    • To propose and demonstrate a novel orientation-sensitive two-dimensional accelerometer.
    • To investigate the simultaneous measurement of vibration orientation and acceleration.
    • To evaluate the sensor's performance, including sensitivity, accuracy, and frequency response.

    Main Methods:

    • Inscribing fiber Bragg gratings (FBGs) in a multi-core fiber (MCF).
    • Utilizing wavelength shifts from three specific cores (central and two non-collinear outer cores) for data acquisition.
    • Experimentally characterizing the sensor's response to varying frequencies, accelerations, and vibration orientations.

    Main Results:

    • Simultaneous acquisition of acceleration and vibration orientation data.
    • Achieved high orientation sensitivity with an accuracy of 0.127° over a 0-180° range.
    • Demonstrated tunability of resonance frequency and sensitivity by adjusting the free-fiber length and weight.

    Conclusions:

    • The proposed FBG-based two-dimensional accelerometer successfully integrates orientation and acceleration sensing.
    • The sensor exhibits excellent orientation accuracy and tunable performance characteristics.
    • Its ease of fabrication and versatility make it suitable for dynamic monitoring in industrial applications.