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Proceedings Paper

Nondestructive inspection of aerospace composites by a fiber-coupled laser ultrasonics system
Author(s): J.-F. Vandenrijt; F. Languy; C. Thizy; M. P. Georges
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Paper Abstract

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 fibercoupled 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.

Paper Details

Date Published: 13 June 2017
PDF: 9 pages
Proc. SPIE 10449, Fifth International Conference on Optical and Photonics Engineering, 104491K (13 June 2017); doi: 10.1117/12.2270710
Show Author Affiliations
J.-F. Vandenrijt, Univ. de Liège (Belgium)
F. Languy, Univ. de Liège (Belgium)
C. Thizy, Univ. de Liège (Belgium)
M. P. Georges, Univ. de Liège (Belgium)

Published in SPIE Proceedings Vol. 10449:
Fifth International Conference on Optical and Photonics Engineering
Anand Krishna Asundi, Editor(s)

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