Method and apparatus for detection of structural damage

G - Physics – 01 – N

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G01N 29/14 (2006.01) G01N 3/32 (2006.01)

Patent

CA 2409016

A method and apparatus for detecting and monitoring fractures in a structure by monitoring acoustic energy transmitted within the structure by receiving continuously over a period of time electrical signals from a plurality of acoustic tranducers carried by the structure in a pulse processor to form data bursts from pulses in the signals and deriving, for each of a plurality of the data bursts, delta-t values representing the differences between burst arrival times at each sensor, the delta-t values forming a delta-t pattern, and generating a damage indication signal when the delta-t pattern is repeated to a predetermined degree.

L'invention concerne un procédé et un appareil de détection et de surveillance de fractures dans une structure grâce au contrôle de l'énergie acoustique transmise dans la structure. Ledit procédé consiste à recevoir de façon continue sur un intervalle de temps des signaux électriques en provenance de plusieurs tranducteurs acoustiques compris dans la structure dans un processeur d'impulsions ; à sélectionner des impulsions des signaux pour former des paquets de données ; à dériver, pour chaque paquet de données, des valeurs delta-t représentant les différences d'heure d'arrivée des rafales à chaque capteur, les valeurs delta-t formant un motif delta-t ; et à générer un signal indicateur de détérioration lorsque le motif delta-t se répète à un niveau prédéterminé.

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