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Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping
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Linear-response and simple hot-wire fiber-optic anemometer using high-order cladding mode.

Fang Wang, Yifan Duan, Mengdi Lu

    Optics Express
    |September 10, 2020
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a novel fiber-optic hot-wire anemometer (HWA) using single-walled carbon nanotubes (SWCNTs) and a tilted fiber Bragg grating (TFBG). The device offers a simple, linear, and highly sensitive method for measuring wind speed.

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    Area of Science:

    • Fiber optics
    • Nanomaterials
    • Anemometry

    Background:

    • Traditional hot-wire anemometers (HWAs) suffer from nonlinear responses.
    • Existing fiber-optic sensors lack sufficient sensitivity and linearity for precise wind speed measurement.

    Purpose of the Study:

    • To develop a novel fiber-optic hot-wire anemometer (HWA) with enhanced linearity and sensitivity.
    • To utilize single-walled carbon nanotubes (SWCNTs) and tilted fiber Bragg gratings (TFBGs) for improved wind speed detection.

    Main Methods:

    • Coating a TFBG with SWCNTs to create a light-to-heat converter.
    • Using a 1550 nm pumping laser coupled to the TFBG cladding mode.
    • Leveraging the Gaussian shape of the TFBG cladding mode to linearize the heat loss-wind speed relationship.

    Main Results:

    • Achieved a highly linear response (R² = 0.9927) in the 0-2 m/s wind speed range.
    • Demonstrated high sensitivity of 7.425 dBm/(m/s) and a resolution of 0.0027 m/s.
    • The system operates with low pump laser power (29.3 mW) and a simple, cost-effective design.

    Conclusions:

    • The SWCNT-coated TFBG HWA offers a promising solution for accurate and sensitive wind speed measurement.
    • The novel use of TFBG cladding modes effectively compensates for nonlinearity in HWAs.
    • This technology presents a simple, low-cost, and high-performance alternative for anemometry applications.