A multi-phase Equation of State diagnostic applied to the study of shock loaded tin

The accurate detection of shock driven material phase transitions demands a multiple diagnostic capable of simultaneously measuring temperature, emissivity, pressure and velocity. By combining optical pyrometry with reflectivity based emissivity diagnostics we report shock loaded tin temperatures from 820 K to 1780 K with associated probable errors down to +/- 12.8 K. In addition simultaneous Class 4 laser heterodyne velocimetry recorded the tin surface velocity as viewed through a LiF anvil. Constraining the tin pressure with lithium fluoride generated microsecond experiment time durations; thermal diffusion models identified the tin/glue/LiF layer as advantageous for temperature measurement. Across a range of pressures, the emissivity corrected temperature data were found to be well aligned with a single tin Equation of State model. AWE {\copyright} Crown Owned Copyright (2011)