Surface temperature measurements of carbon materials in fusion devices

The accuracy of temperature measurements of carbon materials at surface heat loading using IR cameras operating in different wave length regions has been examined. Temperature excursions measured with high spatial and temporal resolution on virgin and plasma exposed samples during and after heat pulses by laser radiation are compared with values of the analytical and numerical solution of the heat diffusion equation. Deviations between measured and calculated results are found already on unexposed samples which can be mostly due to morphological effects. They are more pronounced for shorter wavelength regions. In addition the change of the temperature excursion after surface modification by plasma exposure has been investigated.