Analysis of a thermal system by contact for defect detection in homogeneous materials - Validation by infrared thermography

This is mainly a validation by infrared thermography of an experimental contribution for defect detection by contact based on the flash method, generally used to characterize the thermal diffusivity of the material. Indeed, we have conceived and realized a contact thermal sensor consisting of forty-nine type K thermocouples distributed over the rear face of the sample to be tested. The thermocouples responses resulted by several thermograms, are given in several measuring points distributed over the entire rear face of the sample. We performed a series of experiments using our realized sensor and an infrared camera. Analysis of the experimental results shows that the temperature rise generated by the flash on the rear face, represent important information to explore for establish a thermal system by contact for defect detection in homogeneous materials.