Strain sensor with optical fibre bragg gratings

G - Physics – 01 – L

Patent

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Details

G01L 1/24 (2006.01) G02B 5/18 (2006.01)

Patent

CA 2336193

Strain sensors, and in particular strain rosettes, are described and claimed, in which the strain sensing elements are fibre Bragg gratings. Strain sensors in accordance with the described invention comprise first and second fibre Bragg gratings, and a length of optical fibre connecting the gratings in series, each grating being substantially straight and the two gratings being non-parallel and having different nominal Bragg wavelengths, the connecting length of optical fibre having a bend, characterised in that a portion of the connecting length is tapered, the tapered portion including an elongate waist portion having a reduced cross sectional area and said bend is formed in the waist portion.

L'invention concerne des capteurs de contrainte, en particulier des détecteurs de contrainte en rosette, dans lesquels les éléments détectant les contraintes sont des réseaux de Bragg à fibre optique. Ces capteurs de contrainte comprennent un premier et un second réseau de Bragg à fibre optique, et une fibre optique connectant ces réseaux en série. Chaque réseau est sensiblement linéaire, les deux réseaux sont non parallèles et présentent une longueur d'onde nominale de Bragg différentes et la fibre optique reliant les réseaux est coudée. Ces détecteurs sont caractérisés en ce qu'une partie de la fibre de connexion comprend une partie progressivement resserrée; cette partie resserrée comprend une partie centrale allongée à section réduite, et le coude de la fibre est formé dans cette partie centrale.

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