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Humidity-insensitive temperature sensor based on a quartz capillary anti-resonant reflection optical waveguide.

Shuangqiang Liu, Yingke Ji, Lugui Cui

    Optics Express
    |October 19, 2017
    PubMed
    Summary

    A new fiber optic temperature sensor using a quartz capillary antiresonant reflecting optical waveguide was developed. It shows high temperature sensitivity and effectively overcomes humidity interference for reliable measurements.

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    Area of Science:

    • Photonics and Optical Sensing
    • Materials Science for Sensors
    • Environmental Monitoring Technologies

    Background:

    • Accurate temperature sensing is crucial in various environments, including those with high humidity.
    • Traditional fiber optic sensors can suffer from humidity cross-sensitivity, limiting their application range.
    • Antiresonant reflecting optical waveguides offer a promising platform for novel sensor designs.

    Purpose of the Study:

    • To propose and demonstrate a compact, humidity-insensitive fiber optic temperature sensor.
    • To investigate the sensor's performance under varying temperature and humidity conditions.
    • To address and resolve the humidity cross-sensitivity issue in optical temperature sensing.

    Main Methods:

    • Fabrication of a fiber optic sensor using a quartz capillary antiresonant reflecting optical waveguide.

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  • Experimental investigation of the sensor's transmission spectral responses to temperature changes.
  • Evaluation of the sensor's performance in a humid environment and application of a gold film coating to mitigate humidity effects.

    • Main Results:

    • The sensor demonstrated a high temperature sensitivity of 201 pm/°C within the -30 to 45 °C range.
    • Resonant dips in the transmission spectrum were observed and analyzed for temperature dependence.
    • Coating the sensor with a gold film effectively resolved the humidity cross-sensitivity.

    Conclusions:

    • The proposed quartz capillary antiresonant reflecting optical waveguide sensor is a viable solution for accurate temperature monitoring.
    • The developed sensor exhibits excellent humidity immunity, making it suitable for challenging environments.
    • Potential applications include marine environments and other scenarios requiring robust, humidity-insensitive temperature sensing.