Fibre optic arrangement for measuring the strength of an...

G - Physics – 01 – R

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G01R 19/00 (2006.01) G01R 15/24 (2006.01)

Patent

CA 2064020

A fiber optics arrangement for measuring the intensity of an electric current utilizing the Faraday effect in which the magnetic field surrounding the conductor through which the current flows affects the polarization condition of the light, the path of which leads through the core of an optical fiber which surrounds the conductor in the form of a coil. The light coupled out of the optical fiber, by means of a beam splitter is divided into two partial light beams; the intensities, after passage through one polarizer being measured by one photodetector, respectively. Expansion of the measuring range of the arrangement is achieved by the fact that the polarizers are rotated symmetrically with respect to one another in comparison to the conventional angle of 45 degrees, the angle between the polarizers and the polarization plane of the light coupled into the optical fiber being between +20 degrees and 40 degrees, or between -20 degrees and -40 degrees.

Dans un dispositif à fibres optiques servant à mesurer l'intensité d'un courant électrique au moyen de l'effet Faraday, dispositif avec lequel le champ magnétique entourant le conducteur (1) parcouru par le courant agit sur la polarisation de la lumière, laquelle traverse l'âme d'une fibre optique (2) qui entoure le conducteur (1) sous la forme d'un enroulement (3), la lumière découplée par rapport à la fibre optique (2) étant divisée par un diviseur de faisceau (9) en deux faisceaux partiels dont les intensités (I1, I2) sont mesurées, pour chaque faisceau, après un passage dans un polariseur (12, 11) au moyen d'un photodétecteur (14, 13), l'extension recherchée pour le domaine de mesure du dispositif est obtenue par le fait que les polariseurs (12, 11) sont décalés symétriquement de 45 par rapport à l'angle initial, l'angle (alpha) entre les polariseurs (12, 11) et le plan de la polarisation de la lumière couplée à l'intérieur de la fibre optique (2) étant situé entre +20 et +40 ou entre -20 et -40 .

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