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Multimode microfiber interferometer for dual-parameters sensing assisted by Fresnel reflection.

Qizhen Sun, Haipeng Luo, Hongbo Luo

    Optics Express
    |June 16, 2015
    PubMed
    Summary
    This summary is machine-generated.

    This study presents a low-cost fiber optic sensor for simultaneous refractive index and temperature measurement. The compact sensor utilizes Fresnel reflection in a multimode microfiber for dual-parameter sensing applications.

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    Area of Science:

    • Photonics and Optical Sensing
    • Fiber Optic Sensors
    • Interferometry

    Background:

    • Accurate simultaneous measurement of refractive index (RI) and temperature is crucial for various applications, including chemical analysis and biological detection.
    • Existing fiber optic sensors often face challenges with cost, complexity, or compactness for dual-parameter measurements.

    Purpose of the Study:

    • To propose and demonstrate a compact, low-cost fiber optic sensor capable of simultaneously measuring refractive index and temperature.
    • To investigate the use of Fresnel reflection in a single multimode microfiber for sensing applications.

    Main Methods:

    • Fabrication involved two simple steps: fiber tapering and cleaving the fiber endface.
    • The sensor operates based on an intensity-modulated interference spectrum generated by the tapered fiber and modulated by the cleaved endface.
    • Demodulation of fringe power and free spectrum range (FSR) was employed to extract sensing information.

    Main Results:

    • Achieved refractive index sensitivities of -72.247 dB/RIU and 68.122 nm/RIU.
    • Obtained temperature sensitivities of 0.0283 dB/°C and -17 pm/°C.
    • Demonstrated the feasibility of a compact dual-parameter sensing probe.

    Conclusions:

    • The proposed fiber optic sensor offers a cost-effective and compact solution for simultaneous RI and temperature monitoring.
    • The sensing scheme shows significant potential for advanced bio/chemical detection systems.
    • Further development could lead to even more compact probes for dual-parameter measurements.