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Related Experiment Videos

Hydrogen leak detection using laser-induced breakdown spectroscopy.

A J Ball1, V Hohreiter, D W Hahn

  • 1Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, Florida 32611, USA.

Applied Spectroscopy
|May 20, 2005
PubMed
Summary
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Laser-induced breakdown spectroscopy (LIBS) effectively monitors hydrogen gas using two methods. Both approaches show high sensitivity and linearity, making LIBS a viable field-deployable hydrogen sensor.

Area of Science:

  • Analytical Chemistry
  • Spectroscopy
  • Materials Science

Background:

  • Real-time hydrogen gas monitoring is crucial for safety and industrial processes.
  • Laser-induced breakdown spectroscopy (LIBS) offers potential for sensitive gas analysis.

Purpose of the Study:

  • To evaluate Laser-induced breakdown spectroscopy (LIBS) for real-time hydrogen gas monitoring.
  • To compare two LIBS methodologies: direct gas plasma and solid-substrate-initiated plasma.

Main Methods:

  • Investigated direct laser-induced breakdown in gas streams.
  • Examined laser-induced plasma generation on various metal substrates (Al, Cu, Mo, SS, Ti, W), selecting stainless steel.
  • Analyzed hydrogen detection in N2/H2 mixtures using the H-alpha emission line (656.28 nm).

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Main Results:

  • Both direct gas plasma and stainless steel-initiated plasma yielded comparable hydrogen emission signals.
  • Excellent signal linearity was observed for both methodologies.
  • A limit of detection around 20 ppm (mass) for hydrogen was achieved, with solid-initiated plasma showing a slight advantage.

Conclusions:

  • Laser-induced breakdown spectroscopy (LIBS) is a viable technique for sensitive hydrogen gas sensing.
  • The developed LIBS methods are suitable for field deployment due to their sensitivity and robustness.
  • Solid-substrate-initiated plasma offers a promising approach for enhanced hydrogen detection sensitivity.