Material Spectral Emissivity Evaluation by Dual-Colour Pyrometer

In the aerospace applications the investigation of the physical properties of the materials used as thermal protection systems (TPS) is mandatory. One of the most important material properties involved in the prediction and measurement of the aerothermal loads is the material surface emissivity. At CIRA-PWT laboratory techniques have been developed to perform the investigation of the spectral emissivity by properly using dual colour pyrometers. Those techniques have been applied during tests carried out in the SCIROCCO and GHIBLI facilities on materials candidate for TPS of reentry space vehicles. In the present work those techniques are shown and the kind of results obtained during experiments.