Review of the Apparent Spectral Radiance from the Metal/Window Interface in the Measurement of Shock Temperature of Metals

It was shown that the temperature at the shocked ideal metal/window interface is a constant of time independent, so the apparent spectral radiance from the interface was alto regarded as time independent. This study indicates that the coefficient for light absorption of a metal decreases and the optical depth increases with shock compression. After in consideration of radiative transfer effective, the apparent spectral radiance from the ideal metal/window interface is actually time dependent, and the noticeable process with time keeps about ～10 ns since the arrival of the shock wave at this interface. This study also shows that the interface radiation of a metal in which the temperature distribution has a gradient could be treated as an equivalent radiation of an average temperature in the optical depth, a similar result as that derived from radiative transfer equation is obtained.