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Near-ultraviolet evanescent-wave absorption sensor based on a multimode optical fiber

R A Potyrailo1, S E Hobbs, G M Hieftje

  • 1Department of Chemistry, Indiana University, Bloomington 47405, USA.

Analytical Chemistry
|May 7, 1998
PubMed
Summary

New fiber-optic sensors detect ozone using near-ultraviolet light. The exposed-cladding design offers stability and a linear response, proving practical for ozone monitoring in industrial applications.

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Area of Science:

  • Optical sensing
  • Environmental monitoring

Background:

  • Ozone detection is crucial for industrial processes and environmental safety.
  • Existing methods may lack sensitivity or practicality for real-time monitoring.

Purpose of the Study:

  • To develop and demonstrate the feasibility of fiber-optic near-ultraviolet evanescent-wave sensors for ozone detection.
  • To compare different sensor fabrication methods for optimal performance and stability.

Main Methods:

  • Fabrication of sensors using multimode plastic-clad silica optical fibers.
  • Two sensing section designs: exposed silicone cladding and bare silica core.
  • Characterization of sensor response to ozone, including sensitivity, reversibility, and aging.

Main Results:

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  • The exposed-cladding sensor showed good stability over two months, unlike the bare-silica core design.
  • Linear ozone response observed in the range of 0.02-0.35 vol% with a ~1-minute time constant.
  • Differences in ozone absorption spectra between transmission and evanescent-wave modes were analyzed.

Conclusions:

  • Fiber-optic evanescent-wave sensors are feasible for practical ozone detection.
  • The exposed-cladding design offers superior stability and a useful linear response range.
  • Potential applications include monitoring ozone in water treatment and production facilities.