Poster (Scientific congresses and symposiums)
Laser Ultrasound for NDT: investigation of the generation beam shape
Languy, Fabian; Perrard, Aurélie; Vandenrijt, Jean-François et al.
20165th International Symposium on Laser-Ultrasonics and Advanced Sensing
 

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Keywords :
laser ultrasonics; ultrasounds; non-destructive testing
Abstract :
[en] Usually laser ultrasonic systems use an infrared laser operating at 10 µm to generate the ultrasound in CFRP objects. However this system suffer from an important drawback: optical fiber cannot be used to transport the high energy beam from the laser output to the target which limits the flexibility of the system to investigated complex shaped objects. To overcome this issue, visible light can be used to generate ultrasound. In our case we use a fiber-coupled laser operating at 532 nm. The output end of the optical fiber is placed on an industrial robot arm. The investigated object remains stationary while the optical fiber mounted on the robot arm scan the object. This system offers large flexibility but laser generation at 532 nm is known to be less efficient than CO 2 system emitting at 10 µm. Increasing the visible pulse power is one of the options but optics and CRFF object will be damaged before the same echo level as CO2 generation can be obtained. An alternative solution consists in the investigation of the generation beam size and shape. We recently developed an optical design composed of an axicon lens able to generate annular beam. The diameter of the beam can be adapted. If the axicon lens is removed the optical system provides a disk whose diameter can also be adapted onto the investigated object. Ray-traycing simulations performed with ASAP and experimental beam profile investigated with a beam profiler show good agreement between theoretical and experimental optical design. An experimental comparison between ring and disk shapes will be presented. The comparisons take into account the beam diameter and the beam intensity but also the effect of the angle of incidence will be presented.
Research center :
CSL - Centre Spatial de Liège - ULiège
Disciplines :
Physics
Author, co-author :
Languy, Fabian ;  Université de Liège > CSL (Centre Spatial de Liège)
Perrard, Aurélie
Vandenrijt, Jean-François  ;  Université de Liège > CSL (Centre Spatial de Liège)
Georges, Marc ;  Université de Liège > CSL (Centre Spatial de Liège)
Language :
English
Title :
Laser Ultrasound for NDT: investigation of the generation beam shape
Publication date :
July 2016
Event name :
5th International Symposium on Laser-Ultrasonics and Advanced Sensing
Event organizer :
RECENDT
Event place :
Linz, Austria
Event date :
from 04-07-2016 to 08-07-2016
Audience :
International
Name of the research project :
TECCOMA
Funders :
Service public de Wallonie : Direction générale opérationnelle de l'économie, de l'emploi et de la recherche - DG06
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since 11 February 2017

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