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Thermal diffusivity imaging has the potential to reflect the existence of inhomogeneous material properties which are correlated to increased porosity. For calibration of the thermal diffusivity values the porosity were measured using Computed-Tomography, which yields data on the porosity as well as on the pore morphology. The experimental results agree to the predicted values calculated from the ‘Dethermalization Theory’ combined with the corresponding microstructural information as far as the porosity contents are higher than 2%. [ABSTRACT FROM AUTHOR]

The authors propose the use of an adapted flash thermography method to perform the online detection of open cracks on high temperature reactor (HTR) fuel. The method consists, via an infrared camera, in the measurement of the particle temperature increase produced by a heating pulse on the particle external surface. Study is performed on laser notches and real cracks located in the different particle layers. It includes the influence of the defect relative position with respect to the heating source, as well as the influence of operating conditions. It is shown that this technique is able to yield good discrimination between sound and flawed particles at a rate that meets production constraints. [ABSTRACT FROM AUTHOR]

In a study of components from the automobile industry, we have applied the method of Pulsed Thermography. The components surveyed are functional elements consisting of Glass Fibre Reinforced Plastics. In the present study the glass fiber distribution had to be determined. Since the components studied are of complex shape, including varying thickness, curvatures and edges, we have to take into account the influence of geometry effects as well as specific excitation conditions in the evaluation. The data obtained are corrected with respect to geometry and excitation effects by means of numerical simulation and are shown to be in excellent agreement with 3D-Computed Tomography-results after their correction. [ABSTRACT FROM AUTHOR]