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    A novel fiber-optic ultrasonic sensor using a suspended-core fiber Fabry-Perot interferometer offers high sensitivity and resolution. This compact, robust sensor is ideal for advanced ultrasonic wave detection applications.

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    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Acoustics

    Background:

    • Traditional ultrasonic sensors face limitations in sensitivity and spatial resolution.
    • Fiber-optic sensors offer potential advantages due to their small size and immunity to electromagnetic interference.

    Purpose of the Study:

    • To design and demonstrate a high-resolution fiber-optic ultrasonic sensor.
    • To achieve enhanced sensitivity and spatial resolution for ultrasonic wave detection.

    Main Methods:

    • Fabrication of an intrinsic Fabry-Perot interferometer using acid corrosion of a suspended-core fiber.
    • Development of a compact interrogation system employing spectral sideband filtering.
    • Etching the suspended-core diameter to micrometer scale for improved performance.

    Main Results:

    • The sensor demonstrated high sensitivity across a wide range of ultrasonic wave frequencies.
    • Significantly improved spatial resolution and detection sensitivity were achieved.
    • The sensor exhibited a self-shielding cladding structure for enhanced durability.

    Conclusions:

    • The developed fiber-optic ultrasonic sensor is a promising candidate for high-quality ultrasonic wave detection.
    • The sensor's design offers a simple fabrication process with robust performance.
    • This technology has potential applications in various fields requiring precise ultrasonic monitoring.