A combined technique for measuring Hugoniot and interfacial temperature of preheated metals

A convenient method was developed to perform a combined shock-Hugoniot and interfacial temperature measurement of metals over initial temperature range of 300-1000 K. Experimental details in our investigation are described of (i) a resistive heater placed around the metal specimen to generate a controllable, stable heating source and (ii) a fiber-optic probe with an optical lens coupling system and thirteen 62.5 $\mu $m diameter silica fibers to carry out non-contact measurements for shock velocities and interfacial thermal temperatures of preheated metal. Using shock experimental results of tantalum initially heated to 773 K, a best linear fit of shock velocity to particle velocity gives the coefficients of $U_{S}$(km/s)=1.540(km/s) +1.883$U_{p}$ (km/s) between 248 and 307 GPa, and is obviously 3{\%}-5{\%} below Hugoniot measurements from a room temperature initial state. And obtained interfacial temperatures are in agreement with theoretical calculations of pressure-temperature (P-T) curve. It is indicated that our method is practicable for measuring Hugoniot and shock temperature of preheated metal, which could provide an important approach for studying the temperature effect of shocked metals.