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Nondestructive inspection of aerospace composites by a fiber-coupled laser ultrasonics system
Vandenrijt, Jean-François; Languy, Fabian; Thizy, Cédric et al.
2017In Proceedings of SPIE: The International Society for Optical Engineering, p. 104491K-104491
 

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Keywords :
laser ultrasonics; ultrasounds; non-destructive testing; non-destructive inspection; composite materials
Abstract :
[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.
Research center :
CSL - Centre Spatial de Liège - ULiège
Disciplines :
Physics
Author, co-author :
Vandenrijt, Jean-François  ;  Université de Liège > CSL (Centre Spatial de Liège)
Languy, Fabian ;  Université de Liège > CSL (Centre Spatial de Liège)
Thizy, Cédric ;  Université de Liège > CSL (Centre Spatial de Liège)
Georges, Marc ;  Université de Liège > CSL (Centre Spatial de Liège)
Language :
English
Title :
Nondestructive inspection of aerospace composites by a fiber-coupled laser ultrasonics system
Publication date :
June 2017
Event name :
5th International Conference on Optical and Photonics Engineering
Event organizer :
Optics and Photonics Society of Singapore
Event place :
Singapore, Singapore
Event date :
from 05-04-2017 to 07-04-2017
Audience :
International
Journal title :
Proceedings of SPIE: The International Society for Optical Engineering
ISSN :
0277-786X
eISSN :
1996-756X
Publisher :
International Society for Optical Engineering, Bellingham, United States - Washington
Special issue title :
Fifth International Conference on Optical and Photonics Engineering
Pages :
104491K-104491K
Name of the research project :
TECCOMA (contract N° 7281)
Funders :
Service public de Wallonie : Direction générale opérationnelle de l'économie, de l'emploi et de la recherche - DG06
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