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    Area of Science:

    • Optics and Photonics
    • Biomedical Engineering
    • Materials Science

    Background:

    • Ultrasound wave (UW) measurement is crucial in various fields, including medical diagnostics and industrial testing.
    • Existing UW sensors often face challenges with sensitivity, stability, and environmental interference.
    • Optical fiber sensors offer potential advantages due to their small size, immunity to electromagnetic interference, and remote sensing capabilities.

    Purpose of the Study:

    • To propose and demonstrate a compact optical fiber Fabry-Perot interferometer for sensitive and stable ultrasound wave measurement.
    • To investigate the sensor's performance characteristics, including sensitivity and stability, under UW loading.
    • To develop a simple interrogation method for practical UW detection applications.

    Main Methods:

    • Fabrication of a compact Fabry-Perot interferometer using a suspended cantilever within a sealed hollow-core fiber.
    • Utilizing the end-faces of the leading-in and suspended fibers as reflection mirrors to form an air cavity.
    • Incorporating a graded index fiber as a micro-lens to enhance interference fringe contrast.
    • Employing spectral side-band filtering technology for intensity-based interrogation of UW signals.
    • Designing a sealed sensor structure to mitigate environmental disturbances.

    Main Results:

    • The proposed sensor demonstrated high sensitivity to ultrasound wave loading due to its suspended fiber structure.
    • The sensor exhibited good stability for ultrasound wave detection, attributed to its sealed design that minimizes environmental parameter disturbances.
    • A simple intensity interrogation method was successfully demonstrated for UW detection using spectral side-band filtering.

    Conclusions:

    • The compact optical fiber Fabry-Perot interferometer is a promising technology for sensitive and stable ultrasound wave measurement.
    • The sensor's design, featuring a suspended cantilever and sealed structure, effectively enhances UW detection performance.
    • The developed interrogation technique offers a practical and straightforward approach for real-world UW sensing applications.