Shock temperature measurement for metals (IV) - three layer model and its applications

Effects on shock temperature measurements of the gap between the bulk metal sample and the transparent window were discussed. A three-layer model corresponding to the bulk metal sample/gap/transparent window target-sample assembly was proposed. A universal analytical solution of the heat conduction equation of this model was obtained. The model was applied to the studies in radiometry shock temperature measurement, to the analysis of the thermal resistance model and to the heat conductivity measurement of the window materials at very high pressures. The sharp peak at the beginning of the sample/window interface temperature profile drops down rapidly in a few tens of nanoseconds, and then it approaches slowly to a level close to the equilibrium temperature predicted by the ideal interface model, if the width of the gap is less than 1 micron (less than 0.5 micron is the best choice). It is possible to use a lumpy sample rather than a film to conduct shock temperature measurement.