Abstract
In this paper, the influence of heating and cooling samples on the optical emission spectra and plasma parameters of laser-induced breakdown spectroscopy for Titanium 64, Inconel 718 super alloys, and Aluminum 6061 alloy is investigated. Samples are uniformly heated up to approximately 200°C and cooled down to -78°C by an external heater and liquid nitrogen, respectively. Variations of plasma parameters like electron temperature and electron density with sample temperature are determined by using Boltzmann plot and Stark broadening methods, respectively. Heating the samples improves LIBS signal strength and broadens the width of the spectrum. On the other hand, cooling alloys causes fluctuations in the LIBS signal and decrease it to some extent, and some of the spectral peaks diminish. In addition, our results show that electron temperature and electron density depend on the sample temperature variations.
Highlights
Laser-Induced Breakdown Spectroscopy (LIBS) is an analytical technique for determination of elemental composition of materials
The sample is uniformly heated up to 150°C and the results suggest that increasing the sample temperature can improve the Limits of Detection (LOD)
We study the influence of heating and cooling the samples on optical emission intensity in Laser-Induced Breakdown Spectroscopy spectra in Titanium 64, Inconel 718 super alloys, and aluminum 6061 alloy
Summary
Optics & Laser Science and Technology Research Center, Malek Ashtar University of Technology, Isfahan, Iran. The influence of heating and cooling samples on the optical emission spectra and plasma parameters of laser-induced breakdown spectroscopy for Titanium 64, Inconel 718 super alloys, and Aluminum 6061 alloy is investigated. Samples are uniformly heated up to approximately 200°C and cooled down to -78°C by an external heater and liquid nitrogen, respectively. Variations of plasma parameters like electron temperature and electron density with sample temperature are determined by using Boltzmann plot and Stark broadening methods, respectively. Heating the samples improves LIBS signal strength and broadens the width of the spectrum. On the other hand, cooling alloys causes fluctuations in the LIBS signal and decrease it to some extent, and some of the spectral peaks diminish. Our results show that electron temperature and electron density depend on the sample temperature variations.
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