Magnetometer detection of fatigue damage in aircraft

Details Magnetometer detection of fatigue damage in aircraft Magnetometer detection of fatigue damage in aircraft

G - Physics

01

N

G01N 27/90 (2006.01)

Patent

CA 2282650

An apparatus and a method of detecting wide spread fatigue damage (WFD) on aircraft using the absolute conductivity of the metal. A meandering winding magnetometer (MWM) having a plurality of parallel spaced linear conductor elements are placed in proximity to the aircraft. An electromagnetic field is imposed on the aircraft and the resulting response is sensed. The response is transformed to determine the conductivity of the aircraft structure. The mapping of the conductivity of the aircraft structure produces an indication where microcracks are located in the structure. These early indications of the density, spatial distribution and spatial orientation, as well as the size, of the microcracks give the user an indication of WFD.

L'invention concerne un appareil et un procédé servant à détecter sur un aéronef des dommages généralisés dus à la fatigue (WFD), au moyen de la conductivité absolue du métal. Un magnétomètre à enroulement sinueux (MWM) comporte plusieurs éléments conducteurs linéaires espacés, lesquels sont placés à proximité de l'aéronef. Un champ électromagnétique est appliqué à l'aéronef, et la réponse qui en résulte est captée. La réponse est transformée afin de déterminer la conductivité de la structure de l'aéronef. Le mappage de la conductivité de la structure de l'aéronef permet de déterminer l'emplacement de microfissures dans la structure. Ces indications précoces de densité, de répartition et d'orientation spatiale, et de dimensions de microfissures permettent de renseigner l'utilisateur sur des WFD.

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