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Pulsed photothermal methods for identification and diagnosis

Parametric identification: pulsed photothermal approach is attractive for the identification of thermal diffusivity or thermal conductivity in isotropic or orthotropic materials. For such methods based on the analysis of thermal waves induced by periodic excitation, a frequency sweep at a single point in space or spatial fluctuations at a single frequency could be considered. In such a context, in order to assert both the precision and the robustness of the signal processing, a complete mathematical study must be carried out. In addition, a sensitivity analysis allows us to implement an optimal strategy for the identification of unknown parameters. The direct model and the inverse problem are validated both on numerical simulation and on known materials. Then, several experimental devices were developed:

Identification of human skin thermal properties
Identification in a micron-scale zone of fiber thermal diffusivity when inserted inside a matrix
Identification of thin paint layer

103. Perez L., Autrique L., Feasibility study and optimal design of an experimental bench for identification of liquids thermal diffusivity, IEEE Transactions on Instrumentation and Measurement, Vol. 61, n°10, pp. 2739-2748, 2012.
83. Perez L., Autrique L., Robust determination of thermal diffusivity values from periodic heating data, Inverse problems, Vol. 25, n°4, April 2009.
82. Autrique L., Perez L., Scheer E., On the use of periodic photothermal methods for materials diagnosis, Sensors and actuators B, Vol. 135, n°2, pp. 478-487, 2009.

NDT & Diagnosis: the development of innovative materials with specific properties requires the design of non-destructive testing (NDT) methods. The main objective of this research project is to locate a possible defect in a material using an original thermal method based on frequency analysis. The modulated thermography applied to a zone of reduced dimension could reveal defects in a material. The main drawback of this "local" approach is the inspection time required to evaluate large surface. Indeed a complete cartography of the material is time consuming and limits the method implementation in an industrial context. A new approach has to be investigated and validated in order to reduce the scanning time.

122. Lascoup B., Perez L., Autrique L., Defect localization based on modulated photothermal local approach, Composites Part B engineering, Vol. 65 n°1, pp 109-116, 2014.
113. Lascoup B., Perez L., Autrique L., Crinière A., On the feasibility of defect detection in composite material based on thermal periodic excitation, Composites Part B: Engineering, Vol. 45, n°1, pp. 1023-1030, 2013.

Laurent Autrique, LARIS, Polytech’ Angers
62 avenue notre dame du lac, 49000 Angers
Phone : +33 244 687 518 | laurent.autrique at univ-angers.fr

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