G - Physics – 01 – N
Patent
G - Physics
01
N
G01N 29/14 (2006.01) G01N 29/34 (2006.01) H01S 3/09 (2006.01) H01S 3/10 (2006.01)
Patent
CA 2416011
In a method for ultrasonic testing of objects, ultrasound is generated inside or at the surface of the object. The surface of the object is illuminated with a beam from a long-pulse laser oscillator, typically in the range 1 µs to a few 100 µs, that is substantially free of intensity fluctuations. The light from the incident beam that is scattered or reflected by the surface of the object is collected and demodulated to obtain a signal representative of the ultrasonic motion. The method allows for the use of a compact and efficient arrangement.
L'invention porte sur un procédé de contrôle d'un objet par des ultrasons produits dans ou à la surface de l'objet. La surface de l'objet est éclairée par le faisceau d'un oscillateur à laser à impulsions longues, normalement dans la plage allant de 1µ à quelques 100 µ, sensiblement exempt de fluctuations d'intensité. La lumière du faisceau incident diffusé ou réfléchi par la surface de l'objet est recueillie et démodulée pour obtenir un signal représentatif du mouvement des ultrasons. Le procédé permet d'utiliser un arrangement compact et efficace.
Blouin Alain
Monchalin Jean-Pierre
Pujol Lionel
Davis Jason E. J.
National Research Council Of Canada
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