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Multi-element air-coupled capacitive ultrasonic transducer with dynamic focusing for non-destructive testing of materials : modelling, numerical simulations and experiments

Abstract : This thesis focuses on the development of a Multi-Element Air-coupled Capacitive Ultrasonic Transducer (MEACUT) and its use in the field of non-destructive testing (NDT) of materials. A numerical model is used to simulate the translator, and to optimize its design. A prototype is then built and experimentally characterized to quantify its performance. Its originality lies in the fact that it has a broad frequency bandwidth while offering the possibility of a dynamic focusing. This prototype is then used for the detection of damage caused by impact, in a composite plate. It is clearly found that the spatial resolution of the inspection process employed (C-scan) is greatly improved thanks to the technical performance MEACUT. Finally, a 3D hybrid model is developed to simulate quickly and fully, the process of NDT. The good agreement obtained between numerical predictions and experimental measurements suggests that this simulation tool can be used to develop other NDT experiments, which may in turn exploit the performance of MEACUT.
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Di Zhang. Multi-element air-coupled capacitive ultrasonic transducer with dynamic focusing for non-destructive testing of materials : modelling, numerical simulations and experiments. Other. Université Sciences et Technologies - Bordeaux I, 2013. English. ⟨NNT : 2013BOR14893⟩. ⟨tel-02003491⟩

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