Differential measurement system based on the use of pairs of...

G - Physics – 01 – D

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G01D 5/252 (2006.01) G01D 5/353 (2006.01) G01L 1/24 (2006.01)

Patent

CA 2450988

This system comprises at least one optical sensor (C1, C2, C3) comprising two Bragg gratings (B11, B12; B21, B22; B31, B32) written in two optical waveguides and having sensitivities adjusted so that the respective spectra of the two gratings have a relative spectral shift which depends on the parameter or parameters to be measured. The system also comprises an optical source (6) provided in order to supply light to the two optical waveguides so as to interrogate the latter, means enabling the light to pass successively through the two Bragg gratings of the same sensor, photodetectors in order to measure, on the one hand, the power level of light (R1) having passed only through one of the two optical waveguides and, on the other hand, the power level of light (R'1) having passed successively through the two optical waveguides, and means to process these power levels and supply the values of the parameter or parameters measured. The invention is applicable in particular to measurements of temperatures, stresses and pressures.

L'invention se rapporte à un système comprenant au moins un capteur optique (C¿1?, C¿2?, C¿3?) comportant deux réseaux de Bragg (B¿11?, B¿12?; B¿21?, B¿22?; B¿31?, B¿32?) inscrits dans deux guides d'ondes optiques et dont les sensibilités sont ajustées de façon que les spectres respectifs des deux réseaux présentent une dérive spectrale relative dépendant du ou des paramètre(s) à mesurer. Le système comprend également une source optique (6) qui apporte de la lumière aux deux guides d'ondes optiques afin qu'il soit possible d'interroger ces derniers, des éléments permettant à la lumière de traverser successivement les deux réseaux de Bragg du même capteur, des photodétecteurs qui mesurent, d'une part, le niveau de puissance de la lumière (R¿1?) qui n'a traversé qu'un des deux guides d'ondes optiques et, d'autre part, le niveau de puissance de la lumière (R'¿1?) qui a traversé successivement les deux guides d'ondes optiques, et des éléments qui traitent ces niveaux de puissance et fournissent les valeurs du ou des paramètre(s) mesuré(s). La présente invention est particulièrement adaptée aux mesures de températures, de contraintes et de pressions.

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