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Related Experiment Video

Updated: Apr 19, 2026

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Orientation-dependent fiber-optic accelerometer based on grating inscription over fiber cladding.

Qiangzhou Rong, Xueguang Qiao, Tuan Guo

    Optics Letters
    |December 10, 2014
    PubMed
    Summary

    This study demonstrates an orientation-sensitive fiber-optic accelerometer using a specialized fiber Bragg grating (FBG). This novel sensor accurately measures acceleration by detecting cladding resonance, offering improved directional sensitivity.

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    Area of Science:

    • Photonics and Sensing
    • Optical Fiber Sensors
    • Instrumentation

    Background:

    • Fiber Bragg gratings (FBGs) are widely used in sensing applications.
    • Developing orientation-sensitive accelerometers is crucial for various monitoring tasks.
    • Existing fiber-optic sensors may lack precise directional measurement capabilities.

    Purpose of the Study:

    • To demonstrate an orientation-sensitive fiber-optic accelerometer.
    • To investigate the use of cladding mode resonances in FBGs for directional sensing.
    • To develop a compact and robust fiber-optic sensing probe.

    Main Methods:

    • Fabrication of a fiber Bragg grating (FBG) on the cladding of a thin-core fiber (TCF) using a femtosecond laser.
    • Splicing the TCF stub to a single-mode fiber (SMF) without lateral offset.

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  • Coupling core and cladding modes at the core-mismatch junction to generate two resonances.
  • Utilizing power detection of the cladding resonance for orientation-sensitive acceleration measurement.
  • Monitoring the fundamental core resonance for temperature and power fluctuation referencing.

    • Main Results:

    • Achieved strong orientation dependence in vibration (acceleration) measurements.
    • Demonstrated that the cladding resonance exhibits significant polarization and bending dependence.
    • Successfully referenced out unwanted power fluctuations and temperature perturbations.
    • The sensor probe showed a compact structure with a cladding FBG near the core-cladding interface.

    Conclusions:

    • The developed fiber-optic accelerometer exhibits high orientation sensitivity for acceleration measurements.
    • The use of cladding mode resonance in FBGs is effective for directional sensing.
    • The sensor design allows for simultaneous referencing of environmental perturbations, enhancing measurement accuracy.