Miniaturized contactless sonic ir device for remote...

G - Physics – 01 – N

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G01N 21/70 (2006.01) G01N 25/72 (2006.01) G01N 29/34 (2006.01)

Patent

CA 2382675

A thermal imaging system (80) for detecting cracks (100) and defects in a component (82). An electro-magnetic acoustic transducer (EMAT) (84) is coupled to the component (82), and introduces pulsed sound signals therein. The sound signals cause the defects (100) to heat up, and IR radiation (98) from the component (82) is detected by a thermal camera. The amplitude of the pulsed signals are substantially constant, and the frequency of the pulsed signal can be changed within each pulse. A control unit is employed to provide timing and control for the operation of the EMAT (84) and the camera.

L'invention concerne un système d'imagerie thermique (80) s'utilisant pour détecter les fissures (100) et les défauts d'un composant (82). Un transducteur électromagnéto-acoustique (EMAT) (84), couplé au composant (82), introduit dans ledit composant des signaux sonores impulsionnels. Ces signaux sonores entraînent le réchauffement des défauts (100) et le rayonnement IR (98) provenant du composant (82) est détecté par une caméra thermique. L'amplitude des signaux sonores impulsionnels est sensiblement constante, leur fréquence pouvant être changée à chaque impulsion. On utilise une unité de commande afin d'assurer la synchronisation et le réglage du fonctionnement du transducteur EMAT (84) et de la caméra.

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