Lamb wave ultrasonic probe for crack detection and...

G - Physics – 01 – N

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G01N 29/24 (2006.01) G01N 29/265 (2006.01) G21C 17/017 (2006.01)

Patent

CA 2247333

A probe inspects steam generator tubing for defects. The probe includes a transducer which generates a localized ultrasonic Lamb wave. The ultrasonic wave is transferred to the tubing by a coupling medium, such as water, that physically couples the transducer and the tubing. Defects in the tubing reflect the ultrasonic wave to the probe which detects the reflections. The results are thenused to determine the length and depth of such defects as cracks, pitting, and thinning. The localized ultrasonic wave performs and inspection sensitive enough to detect ligaments between crack segments. This allows highly accurate predictions of tubing integrity and rupture strength.

Une sonde inspecte la tuyauterie d'un générateur de vapeur à la recherche d'anomalies. Elle comprend un transducteur qui génère une onde de Lamb ultrasonore localisée. Celle-ci est transférée au tuyau par un milieu de couplage, tel que l'eau, qui couple physiquement le transducteur et le tuyau. Les anomalies du tuyau réfléchissent l'onde ultrasonore vers la sonde, qui détecte les réflexions. Les résultats sont ensuite utilisés pour déterminer la longueur et la profondeur d'anomalies telles que fissures, piqûres et amincissements. L'onde ultrasonore localisée réalise une inspection suffisamment sensible pour détecter des liaisons entre des segments de fissure, ce qui permet des prédictions extrêmement précises concernant l'intégrité et la résistance à la rupture du tuyau.

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