Reference : Nondestructive inspection of aerospace composites by a fiber-coupled laser ultrasonic...
Scientific congresses and symposiums : Paper published in a journal
Physical, chemical, mathematical & earth Sciences : Physics
http://hdl.handle.net/2268/213731
Nondestructive inspection of aerospace composites by a fiber-coupled laser ultrasonics system
English
Vandenrijt, Jean-François mailto [Université de Liège > > CSL (Centre Spatial de Liège) >]
Languy, Fabian mailto [Université de Liège > > CSL (Centre Spatial de Liège) >]
Thizy, Cédric mailto [Université de Liège > > CSL (Centre Spatial de Liège) >]
Georges, Marc mailto [Université de Liège > > CSL (Centre Spatial de Liège) >]
Jun-2017
Proceedings of SPIE: The International Society for Optical Engineering
International Society for Optical Engineering
Fifth International Conference on Optical and Photonics Engineering
104491K-104491K
No
International
0277-786X
1996-756X
Bellingham
WA
5th International Conference on Optical and Photonics Engineering
from 05-04-2017 to 07-04-2017
Optics and Photonics Society of Singapore
Singapore
Singapore
[en] laser ultrasonics ; ultrasounds ; non-destructive testing ; non-destructive inspection ; composite materials
[en] Laser ultrasonics is a technique currently studied for nondestructive inspection of aerospace composite structures based on carbon fibers. It combines a pulsed laser impacting the surface generates an ultrasound inside the material, through the nondestructive thermoelastic effect. Second a detection interferometer probes the impacted point in order to measure the displacement of the surface resulting from the emitted ultrasound wave and the echo coming back from the different interfaces of the structure. Laser ultrasonics is of interest for inspecting complex shaped composites. We have studied the possibility of using frequency doubled YAG laser for the generation and which is fiber-coupled, together with a fiber-coupled interferometric probe using a YAG laser in the NIR. Our final system is a lightweight probe attached to a robot arm and which is able to scan complex shapes. The performances of the system are compared for different wavelengths of generations. Also we have studied some experimental parameters of interest such as tolerance to angle and focus distance, and different geometries of generation beams. We show some examples of inspection of reference parts with known defects. In particular C-scans of curved composites structures are presented.
Centre Spatial de Liège - CSL
Service public de Wallonie : Direction générale opérationnelle de l'économie, de l'emploi et de la recherche - DG06
TECCOMA (contract N° 7281)
Researchers ; Students
http://hdl.handle.net/2268/213731
10.1117/12.2270710

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