Optical sensor displacement monitor

H - Electricity – 04 – R

Patent

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Details

H04R 23/00 (2006.01) A61B 5/103 (2006.01) A61B 5/11 (2006.01) A61B 5/113 (2006.01) G01B 11/16 (2006.01) G01D 5/353 (2006.01) G01H 9/00 (2006.01) G01L 1/24 (2006.01) G01M 11/08 (2006.01) G02F 1/01 (2006.01) G02F 1/11 (2006.01)

Patent

CA 2130429

An optical sensor comprising an optical fiber having a core covered by a cladding, the cladding having an index of refraction different from that of the core, apparatus for retaining the fiber in a sinuously looped disposition, apparatus for fixing the fiber to an object to be sensed whereby movement to be sensed results in one or both of accordion expansion and contraction of loops of the fiber and microbending of the fiber, apparatus for applying a first optical signal into one end of the fiber, apparatus for detecting a resulting optical signal from the other end of the fiber, and apparatus for comparing the first and resulting optical signals to obtain an indication of the movement.

Capteur optique comprenant une fibre optique dont l'âme et la gaine de celle-ci ont des indices de réfraction différents, un dispositif pour maintenir la fibre en forme de boucle sinueuse, un dispositif pour fixer la fibre à un objet à détecter de façon que le mouvement de cet objet entraîne une expansion/contraction en accordéon des boucles de la fibre et (ou) la microcourbure de la fibre, un dispositif pour injecter un premier signal optique à une extrémité de la fibre, un dispositif pour détecter un signal optique résultant provenant de l'autre extrémité de la fibre, et un dispositif pour comparer le premier signal optique et les signaux optiques résultant afin d'obtenir une indication du mouvement.

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