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Temperature-insensitive optical tilt sensor based on a single eccentric-core fiber Bragg grating.

Di Zheng, Zhuyang Cai, Ignazio Floris

    Optics Letters
    |November 16, 2019
    PubMed
    Summary

    This study introduces a novel optical tilt sensor using an eccentric-core fiber Bragg grating (ECFBG). This temperature-insensitive sensor accurately measures inclination, offering a cost-effective solution for engineering applications.

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    Area of Science:

    • Photonics and Optical Sensing
    • Fiber Optic Sensors
    • Instrumentation

    Background:

    • Traditional tilt sensors often suffer from temperature sensitivity and mechanical wear.
    • Accurate and robust inclination measurement is crucial for various engineering applications.

    Purpose of the Study:

    • To develop a simple, temperature-insensitive optical tilt sensor.
    • To demonstrate the sensor's performance in terms of linearity, sensitivity, resolution, and accuracy.

    Main Methods:

    • Utilized a single eccentric-core fiber Bragg grating (ECFBG) partly inserted into a ceramic ferrule.
    • Monitored the splitting of the reflection spectrum into two peaks based on applied tilt angle.
    • Analyzed the wavelength separation for inclination measurement.

    Main Results:

    • Achieved a temperature-insensitive measurement of tilt angle.
    • Demonstrated a good linear response within a wide dynamic range of ±45°.
    • Reported a sensitivity of 0.012 nm/°, resolution of 0.83°, and accuracy of 0.41°.

    Conclusions:

    • The proposed ECFBG-based optical tilt sensor is simple, compact, and cost-effective.
    • Its inherent temperature insensitivity and lack of mechanical joints make it highly suitable for practical engineering applications.
    • The sensor exhibits excellent repeatability and a wide dynamic range.