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A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response
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Humidity sensor based on a single-mode hetero-core fiber structure.

Qiang Wu1, Yuliya Semenova, Jinesh Mathew

  • 1Photonics Research Center, School of Electronic and Communications Engineering, Dublin Institute of Technology, Kevin Street, Dublin 8, Ireland. qiang.wu@dit.ie

Optics Letters
|May 20, 2011
PubMed
Summary
This summary is machine-generated.

A new fiber optic sensor using poly (ethylene oxide) (PEO) coated on small-core single-mode fiber (SCSMF) demonstrates high sensitivity for relative humidity (RH) detection.

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Area of Science:

  • Optoelectronics
  • Fiber Optics
  • Sensor Technology

Background:

  • Accurate relative humidity (RH) monitoring is crucial in various fields.
  • Traditional RH sensors face limitations in sensitivity and response time.
  • Fiber optic sensing offers a promising alternative due to its inherent advantages.

Purpose of the Study:

  • To propose and demonstrate a novel fiber optic sensor for relative humidity (RH) detection.
  • To investigate the performance of a small-core single-mode fiber (SCSMF) based structure coated with poly (ethylene oxide) (PEO).
  • To evaluate the sensitivity and performance of the proposed sensor across different RH ranges.

Main Methods:

  • Fabrication of a fiber structure comprising SMF28-SCSMF-SMF28.
  • Deposition of poly (ethylene oxide) (PEO), a humidity-sensitive material, onto the SCSMF core.
  • Experimental characterization of the sensor's response to varying relative humidity levels.

Main Results:

  • The PEO-coated SCSMF fiber structure exhibited significant sensitivity to RH changes.
  • A high sensitivity of 430 nm/RHU was achieved in the 80%-83% RH range.
  • A sensitivity of 50 nm/RHU was observed in the 83%-95% RH range.

Conclusions:

  • The proposed SMF28-SCSMF-SMF28 fiber structure coated with PEO is a viable and highly sensitive relative humidity sensor.
  • This novel fiber optic sensor demonstrates potential for advanced environmental monitoring applications.
  • Further research can explore optimization for broader RH ranges and enhanced long-term stability.