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Ultrasonic wave field determination of laser-acoustic sources with arbitrary shapes

: Windisch, T.; Schubert, F.


IEEE Ultrasonics, Ferroelectrics, and Frequency Control Society:
IEEE International Ultrasonics Symposium, IUS 2012 : 7-10 Oct. 2012, Dresden
New York, NY: IEEE, 2012
ISBN: 978-1-4673-4561-3 (Print)
International Ultrasonics Symposium (IUS) <2012, Dresden>
Conference Paper
Fraunhofer IZFP, Institutsteil Dresden ( IKTS-MD) ()

Laser systems for excitation and detection of ultrasonic waves incorporate the benefits of a completely contact free method into ultrasonic NDT systems. Techniques using this huge potential were investigated for a long time but in most cases with focus on symmetric sources for surface waves. To study the material bulk properties strong and surface damaging laser pulses were necessary. However, by shortening the pulse length down to some nanoseconds and below one can excite ultrasonic waves in the bulk of the material without any damage. Important for ultrasonic testing methods is the shape of the ultrasonic field which is widely studied for simple geometries like point or line like sources but not for arbitrary intensity distributions in a general manner. The developed method offers to handle realistic source shapes which enables the link between the optical and acoustical design of contact free ultrasonic systems.