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Optical D-fiber-based volatile organic compound sensor.

John D Gordon1, Tyson L Lowder, Richard H Selfridge

  • 1Department of Electrical and Computer Engineering, Brigham Young University, 459 Clyde Building, Provo, Utah 84602, USA.

Applied Optics
|November 13, 2007
PubMed
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A novel fiber-optic sensor detects volatile organic compounds using a polymer-coated D-fiber. This sensor offers rapid, reversible detection by measuring light polarization shifts caused by compound absorption.

Area of Science:

  • Optoelectronics
  • Chemical Sensing
  • Materials Science

Background:

  • Volatile organic compounds (VOCs) pose environmental and health risks.
  • Accurate and rapid detection of VOCs is crucial for monitoring.
  • Existing detection methods can be complex or slow.

Purpose of the Study:

  • To develop a sensitive and fast fiber-optic sensor for VOC detection.
  • To utilize the evanescent field interaction for enhanced sensitivity.
  • To demonstrate reversible and real-time sensing capabilities.

Main Methods:

  • Fabrication of a single-mode D-fiber sensor with a polydimethylsiloxane (PDMS) layer.
  • Modification of fiber cladding to enhance evanescent light interaction with the PDMS layer.
  • Monitoring changes in light polarization due to VOC absorption altering the PDMS refractive index.

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Main Results:

  • The sensor demonstrated a rapid response time of approximately 1 second.
  • The sensor exhibited natural reversibility for detected compounds.
  • Exponential response curves were observed for dichloromethane (gas) and acetone (liquid).

Conclusions:

  • The developed D-fiber sensor is effective for sensitive and rapid VOC detection.
  • The sensor's design enhances light-matter interaction for improved performance.
  • This technology shows promise for real-time environmental and industrial monitoring applications.