Microscale thermal characterization at temperatures up to 1000 deg. C by photoreflectance microscopy. Application to the characterization of carbon fibres

Micrometric scale thermal diffusivity measurement by photoreflectance microscopy is now a well-known technique. Until now the experiments were performed essentially at room temperature. In this paper we explore temperature resolved tests. We describe the modifications introduced in the experimental set-up and the procedure followed to determine the temperature dependent diffusivity. Different analysis methods are described and first tests performed on known materials and a C/C composite is presented