Thermophysical property measurement at high temperatures by laser-produced plasmas

摘要: Excitation by a high-power laser pulse of material surface generates sequence plasma, fluid flow, and acoustic events. These are well separated in time, their detection analysis can lead to determination properties the condensed phase target. We have developed new methodology for real-time molten metal composition time-resolved spectroscopy laser-produced plasmas (LPP). If is shaped such way that movement bulk due evaporation kept pace with thermal diffusion front advancing into interior target, LPP plume becomes representative elemental composition. In addition, mass loss ablation very correlated diffusivity target matter. For several solid specimens, we show product thickness heat formation proportional per unit molecular weight. Such measurements be extended specimens if ablation, density, formation, weight determined simultaneously. The results from specimen study progress levitation-assisted experiment presented.