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Related Experiment Videos

Water-vapor detection using asynchronous THz sampling.

Michael S Brown1, Gregory J Fiechtner, J V Rudd

  • 1Innovative Scientific Solutions, Inc., 2766 Indian Ripple Road, Dayton, Ohio 45440-3638, USA. michael.brown@wpafb.af.mil

Applied Spectroscopy
|April 13, 2006
PubMed
Summary

This study explores terahertz (THz) spectroscopy for detecting water vapor in ceramic combustors. The fiber-coupled system successfully identified water vapor absorption, proving its viability for industrial applications.

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Area of Science:

  • Spectroscopy
  • Terahertz (THz) technology
  • Chemical sensing

Background:

  • Water vapor detection is crucial in industrial processes.
  • Traditional methods may have limitations in harsh environments.
  • Terahertz (THz) spectroscopy offers a non-invasive sensing approach.

Purpose of the Study:

  • To investigate the use of fiber-coupled THz transmitter/receiver pairs for water vapor detection.
  • To assess the feasibility of THz spectroscopy in windowless ceramic combustors.
  • To evaluate different THz data acquisition techniques.

Main Methods:

  • Utilized a conventional commercial THz transmitter/receiver pair for measurements up to 1.25 THz.
  • Employed a prototype THz system with asynchronous optical sampling (ASOPS) for THz signal acquisition without a delay line.

Related Experiment Videos

  • Used two mode-locked Ti:sapphire lasers for independent transmitter and receiver pumping to record time-domain THz signals.

    • Main Results:

    • Successfully detected water vapor absorption within an alumina transparency window.
    • Demonstrated the applicability of the THz measurement approach in a windowless ceramic combustor.
    • Obtained asynchronous THz-sampling signals up to 1 THz using ASOPS, showing clear water vapor absorption in room air spectra.

    Conclusions:

    • Fiber-coupled THz spectroscopy is a viable method for detecting water vapor in challenging industrial environments like ceramic combustors.
    • ASOPS technique enables efficient THz signal acquisition without mechanical components.
    • The developed THz system shows promise for real-time process monitoring and control.