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Highly sensitive force sensor based on optical microfiber asymmetrical Fabry-Perot interferometer.

Yuan Gong, Cai-Bin Yu, Ting-Ting Wang

    Optics Express
    |March 26, 2014
    PubMed
    Summary
    This summary is machine-generated.

    A novel asymmetrical Fabry-Perot interferometric (AFPI) force sensor using microfiber shows enhanced sensitivity. This cost-effective fiber optic sensor offers improved performance for force measurement applications.

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    Area of Science:

    • Fiber optic sensing
    • Interferometry
    • Nanotechnology

    Background:

    • Asymmetrical Fabry-Perot interferometric (AFPI) sensors offer unique optical properties.
    • Traditional AFPI sensors often face limitations in sensitivity and fabrication complexity.
    • Fiber Bragg gratings (FBGs) are widely used in optical sensing but require precise wavelength matching.

    Purpose of the Study:

    • To develop a highly sensitive and cost-effective AFPI force sensor.
    • To investigate the impact of microfiber structures on AFPI sensor performance.
    • To overcome limitations of conventional extrinsic fiber-optic Fabry-Perot sensors.

    Main Methods:

    • Fabrication of an AFPI sensor using a low-reflectivity fiber Bragg grating (LR-FBG) and a cleaved fiber end.
    • Incorporation of a tapered microfiber section within the AFPI structure.
    • Characterization of force sensitivity using varying microfiber diameters and lengths.

    Main Results:

    • Achieved a force sensitivity of 0.221 pm/μN with a 40 mm length and 6.1 μm waist diameter microfiber.
    • Demonstrated significantly enhanced force sensitivity compared to AFPI sensors with larger diameter single-mode fibers.
    • Confirmed a simple, cost-effective fabrication process for the microfiber AFPI sensor.

    Conclusions:

    • The microfiber-based AFPI force sensor offers greatly enhanced sensitivity due to its reduced diameter.
    • The sensor's sensitivity can be optimized for different force scales by controlling microfiber diameter.
    • The developed AFPI sensor provides superior multiplexing capacity and relaxed wavelength matching requirements compared to FBG-pair-based FPI sensors.