Infrared ndi for shallow defect detection

G - Physics – 01 – N

Patent

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Details

G01N 25/72 (2006.01) B64F 5/00 (2006.01) G01N 21/88 (2006.01)

Patent

CA 2667458

First and second thermal sensors measure the respective temperatures of portions of a surface of a structure such as an aircraft component. An alert signal is emitted if the temperatures of the surface portions are substantially different. An energy source causes heat flow within the structure. Subsurface flaws such as disbonded areas between composite layers and foreign materials obstruct heat flow within the structure and cause proximate surface portions to exhibit different temperatures. A non-alert signal may be emitted if the temperatures of proximate surface portions are essentially the same.

L'invention concerne des premier et second détecteurs thermiques qui mesurent les températures respectives de parties d'une surface d'une structure telle qu'un composant d'avion. Un signal d'alerte est émis si les températures des parties de surface sont sensiblement différentes. Une source d'énergie provoque une circulation de chaleur à l'intérieur de la structure. Des défauts de sous surface tels que des zones décollées entre des couches composites et des matériaux étrangers obstruent la circulation de la chaleur à l'intérieur de la structure et amènent des parties de surface proches à présenter différentes températures. Un signal de non alerte peut être émis si les températures de parties de surface proches sont sensiblement identiques.

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