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Updated: Jun 5, 2026

Measurement and Analysis of Atomic Hydrogen and Diatomic Molecular AlO, C2, CN, and TiO Spectra Following Laser-induced Optical Breakdown
Published on: February 14, 2014
Spatially resolved laser-induced breakdown spectroscopy in methane-air diffusion flames
Abdollah Eslami Majd1, Atoosa Sadat Arabanian, Reza Massudi
1Laser and Plasma Research Institute, Shahid Beheshti University, G.C., Evin, Tehran, Iran, 1983963113.
Abstract:
A new setup for spatially resolved laser-induced breakdown spectroscopy (SR-LIBS) is used for the first time to analyze methane-air diffusion flames. Using this configuration, background continuum emission is reduced, signal-to-background noise ratio is increased up to eight times, and spatial resolution is enhanced. The local equivalence ratio is also quantitatively estimated and the width of the secondary combustion region at a specified height above the burner is determined for two different methane flow rates. Furthermore, the threshold energy for spark formation is measured for regions inside and outside the flame. The results show that threshold energy is larger at the secondary combustion region, near the border of the flame, than inside the flame.
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