A novel thermal non-destructive technique based on a Pulsed Flying Spot is presented here by considering in-plane logarithmic processing of the relaxing temperature field around the heat source spot. Recent progress made in optical control, lasers, and infrared cameras permits the acquisition of 2D temperature fields and localized thermal excitation on a small area instead of the entire recorded image. This study focuses on a new method based on spatial logarithm analysis of a temperature field to analyse and measure different parameters, such as the in-plane thermal diffusivity and localization of the spot. In this paper, this method is presented and the first results of heterogeneous anisotropic materials are depicted. The in-plane thermal diffusivity is estimated with an error lower than 4%, and the initial location of the heating spot is determined.

No abstract

In this paper, a Non Destructive Testing approach by active infrared thermography is used to investigate porosity in oxide/oxide CMC specimens. In this study, an experimental bench is developed using pulsed thermography in reflection or transmission modes coupled with transient heat transfer modelling in order to detect inhomogeneities. Results obtained are discussed and compared to ultrasonic testing which is commonly used in Non Destructive Tests.