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A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings
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High-accuracy fiber Bragg grating inclinometer.

Yujia Cao, Xi Wu, Yuntian Teng

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    Summary
    This summary is machine-generated.

    A novel fiber optic inclinometer overcomes limitations of electromagnetic sensors for precise slope deformation monitoring. This new sensor offers high accuracy and stability in harsh environments, improving structural safety assessments.

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    Area of Science:

    • Geotechnical Engineering
    • Sensor Technology
    • Fiber Optic Sensing

    Background:

    • Inclination monitoring is crucial for slope stability, bridge integrity, and seismic activity detection.
    • Electromagnetic inclinometers present challenges in harsh environments, scalability, and signal reliability.
    • Existing technologies necessitate advancements for robust and accurate deformation monitoring.

    Purpose of the Study:

    • To develop and validate a novel fiber optic inclinometer.
    • To address the limitations of electromagnetic sensors in deformation monitoring applications.
    • To enhance accuracy, sensitivity, and long-term stability for slope monitoring.

    Main Methods:

    • Designed a fiber optic sensor utilizing suspension sensing based on the plumb principle.
    • Incorporated bearings to minimize mechanical friction, enhancing sensor performance.
    • Optimized structural parameters through simulation, followed by sensor fabrication and experimental testing.

    Main Results:

    • The fiber optic inclinometer demonstrated a sensitivity of 305.2 pm/° within a ±9° measurement range.
    • Achieved a resolution of approximately 3.3×10⁻⁴°, accuracy of 2%, and repeatability error of 1.9%.
    • Exhibited favorable creep resistance and long-term measurement stability.

    Conclusions:

    • The proposed fiber optic inclinometer effectively meets the demands for accurate slope deformation monitoring.
    • The sensor design overcomes the environmental and networking limitations of electromagnetic inclinometers.
    • This technology offers a promising solution for critical infrastructure and geological hazard assessment.