Laser Induced Breakdown Spectroscopy on Hot Materials

In high-temperature industrial processes such as steel-making, fast and reliable slag analysis iscrucial for process control but remains underdeveloped compared to metal melt analysis. This studyinvestigates the temperature dependence of Laser-Induced Breakdown Spectroscopy (LIBS) signals,focusing on hot slag and steel samples. By comparing LIBS spectra collected at room temperature and atapproximately 1000 ℃, we evaluated the effects of elevated temperature on emission line intensities andline ratios. Our results show that increased sample temperature leads to higher spectral intensity overall,likely due to enhanced ablation mass and plasma temperature.However, for certain ionic emission lines, such as Mn at 293.93 nm and Cr at 311.91 nm, the signalremains stable or even decreases, suggesting that the thermal energy at 1000 ℃ may be insufficient topopulate higher-energy ionic states effectively. These findings indicate that temperature corrections maybe necessary for accurate LIBS quantification in hot conditions and point to the importance of selectingsuitable line combinations to reduce thermal effects in real-time slag analysis.