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Two-dimensional vector accelerometer based on orthogonal Bragg gratings inscribed in a standard single-mode fiber

Fengyi Chen, Xingyong Li, Ruohui Wang

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    |June 15, 2021
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    We developed a new two-dimensional vector accelerometer using fiber Bragg gratings (FBGs) in a single-mode fiber. This device can simultaneously measure acceleration and orientation, offering a compact solution for motion sensing.

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    Area of Science:

    • Fiber optics
    • Optical sensing
    • Inertial measurement

    Background:

    • Fiber Bragg gratings (FBGs) are widely used in optical sensing.
    • Standard single-mode fiber (SMF) based sensors are desirable for their compatibility and cost-effectiveness.
    • Existing accelerometers often lack simultaneous orientation measurement capabilities.

    Purpose of the Study:

    • To propose and demonstrate a novel two-dimensional vector accelerometer.
    • To utilize orthogonal cladding FBGs inscribed in SMF for acceleration sensing.
    • To achieve simultaneous measurement of acceleration components and orientation.

    Main Methods:

    • Inscribing orthogonal cladding fiber Bragg gratings (FBGs) in a standard single-mode fiber (SMF) using a femtosecond laser point-by-point technique.
    • Developing a simplified power-referenced detection scheme.
    • Experimentally validating the detection of orthogonal acceleration components and orientation.

    Main Results:

    • Successfully demonstrated a two-dimensional vector accelerometer based on cladding FBGs.
    • Achieved direct detection of two orthogonal acceleration components.
    • Simultaneously obtained acceleration and orientation information from a single SMF device.

    Conclusions:

    • The proposed cladding FBG accelerometer offers a novel and compact solution for vector acceleration and orientation sensing.
    • The simplified detection method enhances the practicality of the FBG-based accelerometer.
    • This technology has potential applications in various fields requiring precise motion tracking.