Method and apparatus for crack and fracture detection...

G - Physics – 01 – M

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G01M 11/08 (2006.01)

Patent

CA 2432923

Methods, and corresponding apparatus, for detecting the occurrence of cracks or fractures are described and claimed. The methods utilize Bragg gratings, and the occurrence of a crack is detected by detecting a change in the reflectance and/or transmittance characteristics of the Bragg grating when the crack is transmitted to it. In addition to merely detecting that a crack has occurred, the methods may also provide information on the position of the fracture along the length of the Bragg grating. This may be achieved by comparing the peak intensities and/or widths of the optical reflectance spectra of the unbroken and broken grating. In certain preferred embodiments the Bragg gratings are interrogated using the combination of a broad band source and an optical spectrum analyser, or a tunable laser source and a broad band detector.

La présente invention concerne des procédés et un appareil correspondant qui permettent de détecter l'apparition de craquelures ou de fractures. Les procédés de l'invention, qui font appel à des réseaux de Bragg, permettent de détecter l'apparition d'une craquelure en détectant une modification dans les caractéristiques de réflectance et/ou de transmittance du réseau de Bragg lorsque la craquelure lui est transmise. Outre la simple détection d'une craquelure, les procédés précités peuvent également fournir des informations concernant la position de la fracture sur la longueur du réseau de Bragg, en comparant les intensités de crête et/ou les largeurs des spectres de réflectance optique du réseau intact et du réseau fracturé. Dans certains modes de réalisation préférés, on interroge les réseaux Bragg en utilisant une source à bande large et un analyseur de spectre optique combinés, ou une source laser accordable et un détecteur à bande large combinés.

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