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Polymer Microtip on a Multimode Optical Fiber as a Threshold Volatile Organic Compounds Sensor.

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Polymer microtips on optical fibers can detect volatile organic compounds by sensing changes in refractive index. These sensors act as threshold detectors, useful for chemical leak warning systems.

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Area of Science:

  • Optoelectronics
  • Chemical Sensing
  • Materials Science

Background:

  • Polymer microtips, fabricated via photopolymerization on optical fibers, have been explored as refractive index sensors.
  • Previous work demonstrated their utility in refractive index sensing applications.

Purpose of the Study:

  • To investigate the potential of polymer microtip optical fiber transducers for detecting volatile organic compounds (VOCs) in air.
  • To evaluate their performance as a threshold sensor for chemical leak detection.

Main Methods:

  • Fabrication of polymer microtips on multi-mode optical fibers using UV and VIS photopolymerization.
  • Exposure of microtips to vapors of five different volatile organic compounds.
  • Measurement of changes in return loss as an indicator of vapor presence and concentration.

Main Results:

  • Successful detection of five distinct volatile organic compounds based on induced refractive index changes from vapor condensation.
  • Rapid decrease in return loss observed upon exposure to VOC vapors.
  • Negligible correlation found between dynamic range and the refractive indices or volumes of the tested compounds.

Conclusions:

  • Polymer microtip transducers are sensitive to the presence of VOC vapors, functioning as condensed material threshold sensors.
  • This technology shows promise for developing warning systems to monitor chemical pipeline leakages.