Inter-American Materials Research - Phase Contrast in Pulsed Phase Thermography: Analytical Analysis - CIAM

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Inter-American Materials Research Collaboration in Materials (CIAM). In 2004-2007 we obtained a CIAM Mobility Grant with the same partner in Colombia. This enabled exchanges between our laboratories and led to successful research which opened new opportunities such as the current proposal. Thermal Non Destructive Evaluation (TNDE) is one of the NDE methods used for materials inspection along with other techniques such as X-Rays, Ultrasonics, etc. TNDE has unique advantages such as the possibility to inspect wide surfaces rapidly, it is non-contact, not harmful, requires access to the part from one side only, etc. However, - as other NDE methods - it is afflicted by several problems such as a high sensitivity to noise (for instance spurious reflections from the background, local variations of surface emissivity) and non-uniform heating (heat stimulation is required to get thermal response of the part and thus capability to detect subsurface defects because of their different response with respect to sound material). The objectives of this proposal is to take advantage of the expertise of our Colombian partner specialized in thermal quadrupole method to help solving some of the problems associated with TNDE. Our objectives are thus three-fold: - Objective #1: Obtain an analytical definition of phase contrast (phase contrast is known to be robust for defect assessment and thus is interesting to study). - Objective #2: Establish a method to locate a sound area suitable to compute the phase contrast. The availability of the analytical definition of phase contrast would enable the extrapolation of its value anywhere in the infrared image after the initial thermal pulse heating and thus a link between the theoretical values of the phase contrast and the experimental thermal measurements is possible since any location on the specimen becomes a sound-free area. TNDE data inversion from simple parameters thus becomes possible also. - Objective #3: HQP (Highly Qualified Personnel) training and development is included. Collaboration with our Colombian partner is essential due to its expertise. A partner from Spain with appropriate expertise for the proposal is also included. Our mutual collaboration is synergistic.