Method and apparatus for detecting ultrasonic surface...

G - Physics – 01 – N

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G01N 29/24 (2006.01) G01N 29/50 (2006.01)

Patent

CA 2385678

The present invention detects ultrasonic displacements includes a detection laser to generate a first pulsed laser beam to detect the ultrasonic surface displacements on a surface of the target. Collection optics to collect phase modulated light from the first pulsed laser beam either reflected or scattered by the target. An optical amplifier which amplifies the phase modulated light collected by the collection optics. An interferometer which processes the phase modulated light and generate at least one output signal. A processor that processes the at least one output signal to obtain data representative of the ultrasonic surface displacement at the target.

La présente invention qui concerne la détection de déplacements ultrasoniques utilise un laser de détection pour produire un premier faisceau laser pulsé servant à détecter les déplacements superficiels ultrasoniques d'une surface d'une cible. L'invention concerne également une optique de collecte servant à recueillir la lumière en modulation de phase du premier faisceau laser pulsé, soit qu'il est réfléchi, soit qu'il est dispersé par la cible. L'invention concerne aussi, d'une part un amplificateur optique qui amplifie la lumière en modulation de phase recueillie par l'optique de collecte, d'autre part un interféromètre traitant la lumière en modulation de phase et générant au moins un signal de sortie, et enfin un processeur qui traite le signal de sortie considéré de façon à disposer de données caractéristiques du déplacement ultrasonique superficiel au niveau de la cible.

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