Depth-Penetrating Luminescence Thermography of Thermal-Barrier Coatings

A thermographic method has been developed for measuring temperatures at predetermined depths within dielectric material layers — especially thermal-barrier coatings. This method will help satisfy a need for noncontact measurement of through-the-thickness temperature gradients for evaluating the effectiveness of thermal-barrier coatings designed to prevent overheating of turbine blades, combustor liners, and other engine parts.