Validation of a multitechnical device aimed to reach the temperature of a material under shock loading

Abstract
The temperature is one of the parameters which occurs in the equations of state, to describe the behaviour of materials submitted to an intense shock. A multispectral pyrometer is used to determine the temperature. This diagnostic is well known on classical experimental set-up, but it allows to obtain only one temperature measurement. The aim of this work is to validate a device able to achieve two simultaneous measurements of temperature, coupled with chronometry and velocity measurements, to improve our knowledge of the behaviour and of the temperature of a material under shock loading. It is necessary to resize and to characterize the existing diagnostics and to take into account the duration of the phenomena (700 ns), as well as mechanical and luminous disturbances generated by the shock. The true temperature of the shocked material is obtained from a radiance measurement at short wavelength. So the pyrometer is reconfigured. This assembly was validated on bismuth samples. The obtained results enable us to consider new prospects, like the addition of a reflectivity measurement, in order to reduce uncertainty on the temperature.