Distributed strain and temperature sensing system

G - Physics – 01 – D

Patent

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G01D 5/353 (2006.01)

Patent

CA 2274505

A method and apparatus for measuring the temperature and strain within a structure consists in having optical fibres incorporated in the structure, passing pulses of light down the fibre and detecting the backscattered light. The backscattered light has a changed wavelength i compared with the incident light depending on the strain at the point from where it is backscattered, (the Brillouin shift) and by having a scan rate of an optical scanning filter slower than the repetition rate of the optical pulses and by accurately measuring both the amplitude and frequency of the Brillouin scattered light as a function of time and comparing it with a reference optical fibre it is possible to measure the temperature and strain at positions along the optic fibre. The invention can be used to measure temperature rises and strains induced distributed through a structure.

L'invention concerne un procédé et un appareil de mesure de température et de contrainte dans une structure, consistant à incorporer des fibres optiques dans la structure, à faire passer des impulsions de lumière le long des fibres et à détecter la lumière rétrodiffusée. La lumière rétrodiffusée présente une longueur d'onde modifiée en comparaison avec la lumière incidente, selon la contrainte au point à partir duquel elle est rétrodiffusée (effet Brillouin); en outre il est possible de mesurer la température et la contrainte à des positions situées le long de la fibre optique, en déterminant une vitesse de balayage, d'un filtre de balayage optique, plus lente que la vitesse de répétition des impulsions optiques et en mesurant l'amplitude et la fréquence de la lumière diffusée de Brillouin en fonction du temps et en établissant une comparaison avec une fibre optique de référence. L'invention peut s'utiliser pour mesurer des hausses de température et des contraintes induites réparties dans une structure.

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