Method and apparatus for ultrasonic laser testing

G - Physics – 01 – B

Patent

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G01B 9/02 (2006.01) G01B 11/16 (2006.01)

Patent

CA 2335338

The present invention for detecting ultrasonic displacements includes a detection laser (320) to generate a first pulsed laser beam to generate the ultrasonic surface displacement on a surface of the target (150). A second pulsed laser beam to detect the ultrasonic surface displacement on a surface of the target (150). Collection optics to collect phase modulated light from the first pulsed laser beam either reflected or scattered (131) by the target (150). 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 displacements at the target (150).

L'invention, destinée à la détection de déplacements ultrasoniques, comprend un laser de détection (320) en vue de générer un premier faisceau laser pulsé, afin de générer le déplacement superficiel ultrasonique à la surface d'une cible (150), un second faisceau laser pulsé destiné à détecter le déplacement superficiel ultrasonique à la surface d'une cible (150), des moyens optiques de collecte destinés à collecter la lumière à modulation de phase à partir du premier faisceau laser pulsé, soit réfléchi, soit dispersé (131) par la cible (150), un interféromètre traitant la lumière à modulation de phase et générant au moins un signal de sortie, un processeur traitant ledit signal de sortie, en vue d'obtenir des données représentatives des déplacements superficiels ultrasoniques sur la cible (150).

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