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Orientation-dependent fiber-optic accelerometer based on eccentric fiber Bragg grating.

Fengyi Chen, Ruohui Wang, Xingyong Li

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    Summary
    This summary is machine-generated.

    A novel eccentric fiber Bragg grating (EFBG) accelerometer demonstrates orientation-dependent acceleration measurements. This device utilizes a ghost mode for directional sensing, with core mode monitoring for calibration.

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    Area of Science:

    • Optoelectronics
    • Fiber Optic Sensors
    • Nanotechnology

    Background:

    • Fiber Bragg gratings (FBGs) are widely used in sensing applications.
    • Traditional FBGs lack directional sensitivity, limiting their use in accelerometry.
    • Developing localized and directional fiber optic sensors is an ongoing research area.

    Purpose of the Study:

    • To propose and experimentally demonstrate a highly localized eccentric fiber Bragg grating (EFBG) accelerometer.
    • To investigate the orientation-dependent measurement capabilities of the proposed EFBG accelerometer.
    • To explore methods for calibrating the sensor and mitigating cross-sensitivity.

    Main Methods:

    • Inscribing an EFBG point-by-point (PbP) in a single-mode fiber (SMF) using a femtosecond laser.
    • Recoupling cladding modes to excite a ghost mode via an abrupt taper.
    • Utilizing the asymmetry of the EFBG for directional acceleration sensing.
    • Monitoring the fundamental core mode resonance for calibration.

    Main Results:

    • The EFBG accelerometer exhibited significant directional responses to acceleration due to its inherent asymmetry.
    • Experimental results confirmed the orientation-dependent measurement capabilities.
    • The ghost mode showed a clear sensitivity to acceleration direction.
    • Core mode resonance monitoring proved effective for calibrating power fluctuations.

    Conclusions:

    • A novel EFBG accelerometer with localized and directional sensing capabilities has been successfully demonstrated.
    • The proposed sensor architecture offers a promising solution for accelerometry with enhanced directional information.
    • The integration of ghost mode excitation and core mode monitoring provides a robust sensing system.