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Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping
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Ultraweak intrinsic Fabry-Perot cavity array for distributed sensing.

Zhen Chen, Lei Yuan, Gerald Hefferman

    Optics Letters
    |February 14, 2015
    PubMed
    Summary

    Researchers developed an ultraweak intrinsic Fabry-Perot interferometer (IFPI) array using femtosecond lasers for distributed sensing. This novel sensor array demonstrates precise temperature detection with no crosstalk, achieving a high spatial resolution for accurate environmental monitoring.

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    Area of Science:

    • Optoelectronics
    • Fiber Optic Sensors
    • Laser Fabrication

    Background:

    • Distributed sensing requires precise and reliable sensor arrays.
    • Intrinsic Fabry-Perot interferometers (IFPIs) offer potential for high-resolution sensing.
    • Fabrication challenges have limited the widespread application of IFPI arrays.

    Purpose of the Study:

    • To develop an ultraweak IFPI array using femtosecond laser fabrication for distributed sensing.
    • To evaluate the temperature sensitivity and crosstalk of the fabricated IFPI array.
    • To demonstrate the system's capability for high-resolution distributed temperature sensing.

    Main Methods:

    • Fabrication of an ultraweak IFPI array using a femtosecond laser.
    • Characterization of IFPIs with varying physical lengths for temperature sensitivity.
    • Conducting distributed temperature sensing tests with the IFPI array.
    • Experimental validation of sensor interrogation using smaller bandwidths.

    Main Results:

    • Achieved ultra-low reflectors (<-60 dB) in the IFPI array.
    • Identical temperature sensitivity (-1.5 GHz/°C) observed across different IFPI lengths.
    • Demonstrated no crosstalk between IFPI elements in a distributed sensing setup.
    • Measured a temperature detection limit below 0.0667°C with high spatial resolution.

    Conclusions:

    • The femtosecond laser-fabricated ultraweak IFPI array is suitable for distributed sensing applications.
    • The system exhibits excellent performance in terms of temperature sensitivity, spatial resolution, and crosstalk immunity.
    • The potential for using smaller bandwidths simplifies sensor interrogation, enhancing practical applicability.