Nondestructive inspection of aerospace composites by a fiber-coupled laser ultrasonics system

J.-F. Vandenrijt; F. Languy; C. Thizy; M. P. Georges

doi:10.1117/12.2270710

13 June 2017 Nondestructive inspection of aerospace composites by a fiber-coupled laser ultrasonics system

J.-F. Vandenrijt, F. Languy, C. Thizy, M. P. Georges

Proceedings Volume 10449, Fifth International Conference on Optical and Photonics Engineering; 104491K (2017) https://doi.org/10.1117/12.2270710
Event: Fifth International Conference on Optical and Photonics Engineering, 2017, Singapore, Singapore

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.

Citation Download Citation

J.-F. Vandenrijt, F. Languy, C. Thizy, and M. P. Georges "Nondestructive inspection of aerospace composites by a fiber-coupled laser ultrasonics system", Proc. SPIE 10449, Fifth International Conference on Optical and Photonics Engineering, 104491K (13 June 2017); https://doi.org/10.1117/12.2270710

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available