Fiber laser for ultrasonic laser testing

Details Fiber laser for ultrasonic laser testing Fiber laser for ultrasonic laser testing

G - Physics

01

N

G01N 29/24 (2006.01) G01H 9/00 (2006.01) G01N 21/17 (2006.01) G01N 29/265 (2006.01)

Patent

CA 2657790

Embodiments of the present invention relates to an improved laser for the optical detection of ultrasound. The primary task of this "first" detection laser is to illuminate the spot where a "second" laser is used to generate ultrasound in the part under test. The scattered light from the first laser is collected and analyzed with an interferometer to demodulate the surface vibrations caused by the return echoes of the ultrasound at the surface of the part. The improved detection laser (first laser) is constructed using a diode- pumped fiber laser to produce a high power single -frequency laser source.

Certains modes de réalisation de l'invention concernent un laser amélioré conçu pour la détection optique des ultrasons. La première tâche du "premier" laser de détection consiste à illuminer le spot au niveau duquel un "second" laser est utilisé pour produire des ultrasons dans la zone à l'essai. La lumière diffusée par le premier laser est recueillie et analysée à l'aide d'un interféromètre pour démoduler les vibrations superficielles provoquées par les échos renvoyés par les ultrasons à la surface de la zone en question. Pour obtenir une source laser monofréquence de grande puissance, le laser de détection amélioré (premier laser) est fabriqué à partir d'un laser à fibre à diodes de pompage.

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