4.7 Article

High-resolution polymer optical fibre humidity sensor utilizing single-passband microwave photonic filter

Journal

MEASUREMENT
Volume 179, Issue -, Pages -

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.measurement.2021.109462

Keywords

Polymer optical fiber; Humidity sensor; Optical sensing; Microwave photonics; Mach-Zehnder interferometer

Funding

  1. National Key R&D Program of China [2018YFB1801701]
  2. Hong Kong Research Grants Council [PolyU 152168/17E]
  3. Hong Kong Polytechnic University [YW3G]
  4. ZVGB, Guangxi key research and development program [AB18221033]
  5. Guangxi one thousand Young and Middleaged College and University Backbone Teachers Cultivation Program [20181227]
  6. International S&T Cooperation Program of Jiangsu Province [BZ2020045, BZ2020030, BZ2019063]

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The study introduces a high-resolution POF-based humidity sensor utilizing microwave photonic interrogation technique, achieving a sensitivity of 84 MHz/RH% and a resolution of 0.0119 RH%. By converting humidity changes into frequency shifts of the RF filter's passband, the sensor is capable of detecting humidity with high precision.
Water affinity property of the polymer optical fibre (POF) makes it possible for humidity sensing. In this paper, we propose and experimentally demonstrate a high-resolution POF-based humidity sensor that utilizes microwave photonic interrogation technique. A Mach-Zehnder interferometer (MZI) of one arm inserted with the POF is used as the interrogator, and a single-passband microwave photonic filter is developed for interrogation. The change of the humidity is then converted to the frequency shift of the radio-frequency (RF) filter's passband. A humidity sensor with sensitivity of 84 MHz/RH% and resolution of 0.0119 RH% is achieved in the experiment. Thanks to the introduction of microwave photonic interrogation technique, the proposed humidity sensor owns the abilities of high resolution and anti-vibration. These advantages make it suitable for the potential applications with high precision requirement or in an unstable environment.

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