Study of Thermal Relaxation at CHBr3/NaCl Interface under Shock Compression

Shock temperature measurement of opaque materials is through measuring the optical radiation at sample/window interface. So the research of optical radiation history at sample/window is fundament of shock temperature measurement of opaque materials. But this research is not easily realized because of the mixture of temperature changing at the interface caused by thermal diffusion and wave reflecting because of mismatching of shock impedance between sample and window material. In this paper a special experiment system was proposed for researching the thermal relaxation process. The experimental results at two shock pressure points show that the thermal relaxation time is about nano-second, which agrees with the theoretical result calculated by Grover et al.