Sensor and method for detecting changes in distance

G - Physics – 01 – B

Patent

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G01B 11/16 (2006.01)

Patent

CA 2359251

The present invention is directed to a condor for detecting changes in the distance between a first and a second location, having at least one substantially helically coiled optical fiber, which is able to be mechanically connected to at least one of the locations, and having a light transmitter and a detecting device for optical signals, the detectinq device being able to generate an output signal, which is dependent upon the polarization state of the optical signal transmitted via the optical fiber. The present invention is also directed to a method for detecting the changes in distance between a first and a second location, having the following features: at least one of the locations is mechanically coupled to a substantially helically coiled optical fiber; an optical signal having a known polarization state is launched into the optical fiber; following transmission over the connecting line, this is detected in such a way that information is obtained with respect to its polarization state; from this information, the change in distance is determined.

L'invention concerne un détecteur servant à détecter des variations de distance entre un premier et un second endroit, qui comprend au moins une fibre optique enroulée sensiblement en spirale et pouvant être reliée de manière mécanique à au moins un des endroits. Ce détecteur comprend en outre un émetteur de lumière et un dispositif de détection pour des signaux optiques. Ledit dispositif de détection est en mesure de délivrer un signal de sortie qui dépend de l'état de polarisation du signal optique transmis par l'intermédiaire de la fibre optique. L'invention concerne par ailleurs un procédé permettant de détecter des variations de distance entre un premier et un second endroit, qui présente les caractéristiques suivantes: au moins un des endroits est couplé de manière mécanique à une fibre optique enroulée sensiblement en spirale; un signal optique dont l'état de polarisation est connu est injecté dans la fibre optique; ce signal optique est détecté après transmission par l'intermédiaire de la ligne de connexion, de manière que des informations sur son état de polarisation puissent être obtenues et servent de base pour déterminer la variation de distance.

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