Method for locating and measuring deformations in a work of...

G - Physics – 01 – B

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G01B 11/16 (2006.01) E02D 1/08 (2006.01) E02D 33/00 (2006.01) G01D 5/353 (2006.01)

Patent

CA 2559356

The invention relates to a method for locating deformations in a work of civil engineering, characterized by the fact at least one geosynthetic (1) is applied inside or below said work, said geosynthetic being provided with a plurality of parallel optical fibers (2a - 2e) which can transmit signals, wherein the optical fibers comprise regularly spaced Bragg networks (3) which are divided up into series(4) of consecutive N1 networks corresponding to the same wavelength, wherein said series are divided up into identical sets each comprising consecutive N2 series corresponding to different wavelengths, and by the fact that, in at least two optical fibers, numbers N1 of networks of a series and numbers N2 of series (4) of a set (5) are determined in such a way that by measuring the differences between the wavelengths of the incident light sent in each of the optical fibers and the wavelengths of the light reflected by the Bragg networks make it possible to locate the deformations undergone by the work and to measure the elongations of the optical fibers at the places of said deformations.

L'invention concerne un procédé pour localiser et mesurer les déformations d'un ouvrage de génie civil, caractérisé par le fait que l'on applique dans ledit ouvrage ou sous ledit ouvrage au moins un géosynthétique (1) équipé d'une pluralité de fibres optiques (2a à 2e) parallèles et susceptibles de transmettre des signaux, lesdites fibres optiques comportant des réseaux de Bragg (3), régulièrement espacés et répartis en séries (4) de N1 réseaux consécutifs correspondant à la même longueur d'onde, lesdites séries étant elles-mêmes réparties en ensembles identiques comportant chacun N2 séries consécutives correspondant à des longueurs d'onde différentes, et par le fait que, dans au moins deux fibres optiques, les nombres N1 de réseaux d'une série et les nombres N2 de séries (4) d'un ensemble (5) sont déterminés de telle manière que la mesure des écarts entre les longueurs d'onde de la lumière incidente envoyée dans chacune desdites fibres optiques et les longueurs d'onde de la lumière réfléchie par les réseaux de Bragg permettent, d'une part, de localiser les déformations subies par l'ouvrage et, d'autre part, de mesurer les élongations desdites fibres optiques à l'endroit des déformations.

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