Non-destructive non-contact imaging: state of the art and potential for heterogeneous materials

Walaszek, Henri; Centre Technique des Industries Mecaniques; France

Roumagnac, P.; LRCCP; France
Walaszek, H.; CETIM; France

ID: ECNDT-0332-2018
Session: Imaging - UT 1
Room: R2
Date: 2018-06-14
Time: 15:40 - 16:00

Ultrasonic testing is the most widely used method in NDT. One of the limitations of the “conventional” ultrasonic method is that the ultrasonic waves require a coupling medium to be transmitted from the sensor to the component, for example gel or water. A recent technological evolution makes it possible to practice these ultrasounds without physical contact with the product. In this case, the coupling of the ultrasounds is done by air. The technique thus makes it possible to produce cartographies of attenuating components, or of rough surface, with interesting resolutions of millimetric range.
The presentation will take stock of the possibilities of aerial ultrasound, and examples of application on porous, ceramic, composite or elastomer products will be presented. An analysis of the potential of the method will be made with those of laser-coupled ultrasonic methods, or with those of the “terahertz” microwave method