Section: New Results

Outdoor InfraRed Thermography

Joint thermal and electromagnetic diagnostics

Participants : Nicolas Le Touz, Jean Dumoulin.

In this study, we present an inversion approach to detect and localize inclusions in thick walls under natural solicitations. The approach is based on a preliminary analysis of surface temperature field evolution with time (for instance acquired by infrared thermography); subsequently, this analysis is improved by taking advantage of a priori information provided by ground penetrating radar reconstruction of the structure under investigation. In this way, it is possible to improve the accuracy of the images achievable with the standalone thermal reconstruction method in the case of quasiperiodic natural excitation. [19]

Long term monitoring of transport infrastructures: from deployment to standardization

Participants : Antoine Crinière, Jean Dumoulin, Laurent Mevel.

Long term monitoring of transport infrastructures by infrared thermography has been studied and tested on different structures. A first standalone infrared system architecture developed is presented and discussed. Results obtained with such system on different Civil Engineering structures are presented. Some data processing approaches and inverse thermal model for data analysis are introduced and discussed. Lessons learned from experiments carried out in outdoor with such system are listed and analyzed. Then, a new generation of infrared system architecture is proposed. Finally, conclusions and perspectives are addressed.[29], [46]

Infrared data reconstruction and calibration for long term monitoring

Participants : Thibaud Toullier, Jean Dumoulin, Laurent Mevel.

This study focuses on the evaluation and improvement of thermal instrumentation solutions for long-term monitoring of next-generation transport infrastructure. A test site was equipped with thermocouples and an infrared thermography system coupled with monitoring of environmental parameters. A method of spatial reconstruction of infrared images is presented. Measurement data acquired on site and then post-processed are analysed over time. A conclusion on the results achieved and prospects are proposed [48]