Assessment of used turbine blades on and beneath the surface for product regeneration: Generation of a damage model based on reflection, geometry measurement and thermography

A camera with a directional illumination system and a thermography camera with 50 mm optics with inductive excitation system are used in order to gather hints for defects on the surface. Using the directional illumination system each picture with a different illumination angle is a sample of the surfaces reflection distribution of each pixel. Deviation of the surface microstructure directly changes the reflection distribution and points to possible damages.