Laser ultrasonics and mode conversion for flaw depth gauging - Archive ouverte HAL
Conference Papers Year : 2013

Laser ultrasonics and mode conversion for flaw depth gauging

Abstract

Compared to earliest non destructive testing and evaluation methods based on transducers, laser ultrasonics shows specific advantages. It is a non-contact method combining a high spatial resolution and a large bandwidth, allowing high temperature and/or geometrically complex materials testing. In this work, ultrasonic waves are generated in an aluminium sample by a pulsed Nd:YAG laser in the thermoelastic mode. An interferometric optical probe is used to detect surface waves after their interaction with a flaw. This study will particularly focus on two Rayleigh waves. The first one is directly transmitted by the flaw whereas the second one is mode-converted from the head wave. Considering the relative amplitude of these two waves, experimental results lead to an original flaw depth gauging method.
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Dates and versions

hal-00971600 , version 1 (03-04-2014)

Identifiers

  • HAL Id : hal-00971600 , version 1

Cite

Frédéric Faëse, Frédéric Jenot, Mohammadi Ouaftouh, Marc Duquennoy, Mohamed Ourak. Laser ultrasonics and mode conversion for flaw depth gauging. 13th International Symposium on Nondestructive Characterization of Materials, NDCM-XIII, 2013, Le Mans, France. paper 15509, 9 p. ⟨hal-00971600⟩
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