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Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping
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An optical fiber sensor for remote pH sensing and imaging.

Jian Wang1, Lili Wang

  • 1Department of Physics and Chemistry, Henan Polytechnic University, Jiaozuo, 454003 China. jianwang@opt.ac.cn

Applied Spectroscopy
|March 28, 2012
PubMed
Summary

A novel fiber-optical probe enables simultaneous pH sensing and real-time imaging. This technique overcomes limitations of conventional methods, offering high-quality imaging for remote chemical sensing applications.

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Area of Science:

  • Optical Engineering
  • Chemical Sensing
  • Materials Science

Background:

  • Conventional imaging bundles struggle to provide high-quality images during pH sensing.
  • Remote real-time monitoring of chemical environments requires advanced optical tools.

Purpose of the Study:

  • To fabricate a fiber-optical probe for simultaneous pH sensing and real-time imaging.
  • To overcome limitations of existing technologies for combined optical sensing and imaging.

Main Methods:

  • Fabrication of a probe by connecting a polymer imaging fiber and a modified gradient index (GRIN) lens rod with a sensing film.
  • Development of an optical system using an improved metallographic microscope to cooperate with the probe.
  • Investigating the probe's linear range (pH 1.2-3.5) and imaging capabilities.

Main Results:

  • Successful fabrication of a fiber-optical probe with high-quality imaging and pH sensing capabilities.
  • Demonstrated ability to observe remote samples while measuring pH.
  • Observed higher surface pH values on iron and rust samples compared to buffer solutions due to chemical reactions.

Conclusions:

  • The novel probe overcomes challenges in obtaining high-quality images during pH sensing.
  • The technique shows great potential for multifunctional optical detection, particularly in chemical and biosensing.
  • Preliminary applications reveal insights into corrosion and reaction processes at the microscale.