Evaluating the position of a disturbance

G - Physics – 01 – D

Patent

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G01D 5/353 (2006.01) G01D 5/26 (2006.01)

Patent

CA 2647173

The present invention relates to a method of and apparatus for evaluating the position of a time-varying disturbance on an optical waveguide. The steps include: transmitting sensing signals onto the optical waveguide, which sensing signals have imposed thereon a modulation which is dependent, at least in part, on their time of transmission; receiving returned sensing signals, which signals have been exposed to the disturbance; and, from the previously imposed modulation on the returned sensing signals, evaluating the position of the disturbance. Because the sensing signals have a modulation that is dependent at least in part on their transmission time, the round-trip time for the signals to travel to and from a disturbance can be inferred. From this round trip time, or a value related thereto, it is possible to directly or indirectly evaluate the position of the disturbance.

Cette invention concerne un procédé et un dispositif permettant d'évaluer la position d'une perturbation variant dans le temps sur un guide d'onde optique. Les étapes du procédé consistent à transmettre des signaux de détection sur le guide d'onde optique, une modulation étant appliquée sur ces signaux de détection, laquelle dépend, au moins en partie, du moment de leur transmission; à recevoir les signaux de détection renvoyés, lesquels signaux ont été exposés à la perturbation; et, à partir de la modulation préalablement appliquée sur les signaux de détection, à évaluer la position de la perturbation. Les signaux de détection ayant une modulation qui dépend au moins en partie du moment de leur transmission, la durée totale du cycle de déplacement des signaux vers et depuis une perturbation peut être supposée. Partant de cette durée totale de cycle, ou d'une valeur associée à cette durée, il est possible d'évaluer directement ou indirectement la position de la perturbation.

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