New development of thermographic NDT for laminated composites using contact cooling of IR-transmissive optical solid

The thermographic NDT using a contact cooling technique of an IR transmissive optical solid was newly developed for the defect inspection of the laminated composites. The resolution of the defect inspection using the proposed contact cooling technique was examined both in the computational simulation and the experimental study. The thermal transfer technique for the samples with the less emissivity was developed together with the contact cooling technique using the IR transmissive solid. The usefulness of the thermal transfer technique was demonstrated in the thermographical inspection of the delaminated defects in laminated FRP and the debonded defects in copper-polyimide laminates with less emissive bare surfaces.