Fiber optic current sensor with bend birefringence compensation

G - Physics – 01 – R

Patent

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Details

G01R 15/24 (2006.01) G01R 33/032 (2006.01)

Patent

CA 2258602

A fiber optic subassembly for a Faraday-effect current sensor has an optical sensing fiber supported by a tubular holder (12) in a square or rectangular configuration, with the three of the four corners thereof designed with bends which have a net zero bend-induced birefringence. The bends are formed by providing two loops which have effective angles of about 90~, the two loops lying in orthogonal planes, such that the fast axis of birefringence in the first loop is parallel to the slow axis of birefringence in the second loop, and the slow axis of birefringence in the first loop is parallel to the fast axis of birefringence in the second loop. In this manner, retardance accumulated in the first loop is offset by retardance accumulated in the second loop. If the loops are substantially identical, the offsetting of the retardance is effectively complete such that the bend exhibits negligible bend- induced birefringence.

Cette invention se rapporte à un sous-ensemble à fibre optique pour un capteur de courant à effet de Faraday, ce sous-ensemble comportant une fibre de détection optique soutenue par un support tubulaire (12) dans une configuration carrée ou rectangulaire, dont trois des quatres coins comportent des coudes ayant une biréfringence nette induite par les coudes égale à zéro. Les coudes sont formés par deux boucles ayant des angles effectifs d'environ 90·, les deux boucles se situant dans des plans orthogonaux, de sorte que l'axe rapide de biréfringence de la première boucle est parallèle à l'axe lent de biréfringence de la seconde boucle, et l'axe lent de biréfringence de la première boucle est parallèle à l'axe rapide de biréfringence de la seconde boucle. Ainsi, la retardance accumulée dans la première boucle est décalée par la retardance accumulée dans la seconde boucle. Si les boucles sont sensiblement identiques, le décalage de la retardance est effectivement complet, de sorte que chaque coude présente une biréfringence induite par les coudes qui est négligeable.

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