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Bio-inspired flow rate sensor based on optical microfiber embedded soft film.

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    This study presents a bionic optical microfiber flow rate sensor inspired by fish. The device offers sensitive, high-resolution, and rapid detection of liquid flow rates, with tunable performance for various applications.

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    Area of Science:

    • Biomimetics and Sensor Technology
    • Optical Microsystems
    • Fluid Dynamics

    Background:

    • Superficial neuromasts in fish lateral lines are highly sensitive to water flow.
    • Existing flow rate sensors often lack sensitivity, resolution, or speed.
    • A need exists for advanced, biomimetic flow sensing technologies.

    Purpose of the Study:

    • To develop a bionic optical microfiber flow rate sensor inspired by fish neuromasts.
    • To investigate the relationship between liquid flow rate and microfiber transmittance.
    • To demonstrate tunable sensitivity and working range for the sensor.

    Main Methods:

    • Embedding a U-shaped optical microfiber into a thin polydimethylsiloxane (PDMS) film.
    • Utilizing the bending-dependent transmittance change of the microfiber as the sensing mechanism.
    • Characterizing sensor performance including detection limit, resolution, response time, sensitivity, and working range.

    Main Results:

    • The bionic sensor accurately measures liquid flow rate via microfiber transmittance changes.
    • Achieved a low detection limit (< 0.05 L/min) and high resolution (0.005 L/min).
    • Demonstrated a fast response time of 12 ms and tunable sensitivity/working range.

    Conclusions:

    • The developed optical microfiber sensor effectively mimics fish neuromasts for flow sensing.
    • The sensor offers excellent performance metrics, including high sensitivity and rapid response.
    • Tunable parameters allow for versatile application in diverse liquid flow monitoring scenarios.