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    Area of Science:

    • Biomedical Engineering
    • Materials Science
    • Optical Sensing

    Background:

    • Fabry-Perot interferometers are widely used for sensing applications.
    • Miniaturization of fiber optic sensors is crucial for minimally invasive medical procedures.
    • Flexible diaphragm materials are needed for sensitive and robust sensor designs.

    Purpose of the Study:

    • To develop and characterize a novel Fabry-Perot fiber tip sensor with a flexible air-liquid filled cavity.
    • To evaluate the sensor's performance for temperature, pressure, and force measurements.
    • To assess the sensor's suitability for monitoring insertion forces in robotic cochlear implantation.

    Main Methods:

    • Fabrication of a Fabry-Perot fiber sensor utilizing a parylene C diaphragm.
    • Signal processing using inverse fast Fourier transform to track the cavity.
    • Experimental testing for temperature, external gas pressure, and force sensing.
    • In-situ testing during insertion into a human temporal bone.

    Main Results:

    • The sensor exhibited temperature sensitivities of 6.1 nm/°C (increase) and 9.6 nm/°C (decrease).
    • External gas pressure sensitivity was measured at 15 nm/kPa.
    • Force sensing sensitivity was determined to be approximately 8.7 nm/mN after silicone embedment.
    • Successful preliminary testing for insertion force monitoring in a human temporal bone model.

    Conclusions:

    • The developed Fabry-Perot fiber tip sensor offers high sensitivity and flexibility.
    • The sensor is a promising candidate for various sensing applications, including medical device insertion monitoring.
    • Further development could enable real-time feedback for procedures like robotic cochlear implantation.