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Related Concept Videos

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Building Langmuir Probes and Emissive Probes for Plasma Potential Measurements in Low Pressure, Low Temperature Plasmas
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Homogenization of Plasma Emission Collection for Multichannel Spectrometers.

John Lucchi1,2, Mauro Martinez1, Matthieu Baudelet1,2,3

  • 1National Center for Forensic Science, University of Central Florida, Orlando, FL, USA.

Applied Spectroscopy
|April 17, 2019
PubMed
Summary

This study introduces Köhler illumination to improve Laser-Induced Breakdown Spectroscopy (LIBS) for elemental imaging. This technique enhances signal homogeneity, boosting efficiency when analyzing complex material interfaces.

Keywords:
Köhler illuminationLIBShomogenizationlaser-induced breakdown spectroscopyoptics

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Area of Science:

  • Analytical Chemistry
  • Spectroscopy
  • Materials Science

Background:

  • Laser-induced breakdown spectroscopy (LIBS) excels at elemental surface imaging.
  • Inhomogeneities in laser-induced plasma arise from sampling spots larger than material interfaces.
  • Signal heterogeneity complicates imaging with fiber bundles and spectrometers, leading to inconsistent data.

Purpose of the Study:

  • To enhance the homogeneity of plasma collection in LIBS analysis.
  • To improve the efficiency and reliability of elemental imaging for complex surfaces.
  • To address signal variations caused by spatially inhomogeneous spectral sources.

Main Methods:

  • Implementation of Köhler illumination to achieve uniform illumination.
  • Application of the method to analyze a metallic interface using LIBS.
  • Evaluation of plasma collection homogeneity with inhomogeneous spectral sources.

Main Results:

  • Köhler illumination successfully created homogenous illumination, irrespective of source variations.
  • A significant improvement in plasma collection homogeneity was observed.
  • Up to a sixfold increase in homogeneity was demonstrated for LIBS analysis of a metallic interface.

Conclusions:

  • Köhler illumination is an effective strategy for homogenizing plasma collection in LIBS.
  • This approach significantly enhances the reliability and efficiency of elemental imaging, especially for heterogeneous samples.
  • The method offers a practical solution to overcome signal variations in LIBS analysis of material interfaces.