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Compact gas refractometer based on a tapered four-core fiber.

Zhihua Shao, Xueguang Qiao, Qiangzhou Rong

    Applied Optics
    |January 16, 2019
    PubMed
    Summary

    A novel fiber optic sensor accurately measures gas refractive index (GRI) using a compact interferometer. This device offers high sensitivity and minimal temperature cross-sensitivity, making it ideal for chemical and biosensing applications.

    Area of Science:

    • Optoelectronics and Photonics
    • Fiber Optic Sensing Technology
    • Chemical and Biological Sensing

    Background:

    • Accurate gas refractive index (GRI) measurement is crucial for various sensing applications.
    • Existing methods may face limitations in sensitivity, compactness, or temperature cross-sensitivity.
    • Development of robust and high-performance GRI sensors is an ongoing research area.

    Purpose of the Study:

    • To propose and experimentally demonstrate a compact in-line interferometer for precise GRI measurement.
    • To investigate the sensor's sensitivity and performance characteristics.
    • To evaluate the potential of the sensor for chemical and bio-sensing applications.

    Main Methods:

    • Fabrication of an in-line interferometer using a tapered four-core fiber (TFCF) sandwiched between single-mode fibers (SMFs).

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  • Utilizing the fiber taper to couple external GRI variations to multimode interference within the TFCF.
  • Employing intensity demodulation to mitigate temperature cross-sensitivity.

    • Main Results:

    • Achieved a high sensitivity of 1280.94 dB/refractive index unit for GRI measurement around 1.0.
    • Demonstrated that temperature changes primarily cause wavelength shifts, which can be ignored by intensity demodulation.
    • Confirmed the sensor's robustness and potential for practical applications.

    Conclusions:

    • The proposed compact in-line interferometer offers a promising solution for accurate GRI measurement.
    • The sensor exhibits high sensitivity and negligible temperature cross-sensitivity, enhancing its reliability.
    • This fiber optic gas refractometer is a strong candidate for advanced chemical and bio-sensing platforms.