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Related Experiment Videos

Fibre optic coupler as a detector for microfluidic applications.

Dorota Stadnik1, Artur Dybko

  • 1Warsaw University of Technology, Department of Analytical Chemistry, Noskowskiego 3, 00-664 Warsaw, Poland.

The Analyst
|July 18, 2003
PubMed
Summary

This study introduces a novel fiber optic coupler for real-time refractive index monitoring. The device accurately measures saccharose concentration and performs absorbance tests, demonstrating repeatable, hysteresis-free performance.

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Area of Science:

  • Optoelectronics
  • Chemical Sensing
  • Biomedical Engineering

Background:

  • Fiber optic couplers are essential components in optical systems.
  • Sensing applications require precise measurement of liquid properties.
  • Existing methods for saccharose concentration and absorbance measurements can be improved.

Purpose of the Study:

  • To present a novel fiber optic coupler design.
  • To evaluate the coupler's performance in measuring liquid refractive index.
  • To demonstrate its application in saccharose concentration and absorbance measurements.

Main Methods:

  • Constructed a fiber optic coupler using two polymer optical fibers.
  • Integrated a microchannel for liquid delivery between the fibers.

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  • Utilized a red light emitting diode (LED) as the light source.
  • Employed a spectrometer as the photodetector.
  • Tested the coupler with saccharose solutions and bromothymol blue solutions.

    • Main Results:

    • Coupling efficiency was found to be dependent on the liquid's refractive index.
    • Real-time monitoring of saccharose solution refractive index changes was achieved.
    • Repeatable signal changes with no hysteresis were observed.
    • Absorbance measurements of bromothymol blue at varying pH levels were successfully performed.

    Conclusions:

    • The developed fiber optic coupler is suitable for real-time refractive index monitoring.
    • The device offers a reliable method for saccharose concentration sensing.
    • The coupler demonstrates potential for various absorbance-based chemical sensing applications.