Method and arrangement for measuring a magnetic field using...

Details Method and arrangement for measuring a magnetic field using... Method and arrangement for measuring a magnetic field using...

G - Physics

01

R

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

Patent

CA 2213421

Two light signals (L1',L2') pass, in opposite directions, through a series circuit comprising a first optical fiber (4), a first polarizer (5), a Faraday sensor device (3), a second polarizer (6) and a second optical fiber (7). To set the working point, additionally, the planes of polarization of both light signals are reciprocally rotated by a predetermined angle of rotation by rotation means (8) between the two polari- zers. From light intensities (I1, I2) of the two light signals (L1,L2), after passing through the series cir- cuit, a measuring signal (M) is determined which is independent of vibrations and bending influences in the optical fibers.

Deux signaux lumineux (L1', L2') traversent en sens opposés un circuit série comprenant une première fibre optique (4), un premier polariseur (5), un capteur de Faraday (3), un deuxième polariseur (6) et une deuxième fibre optique (7). Pour le réglage du point de travail, les plans de polarisation des deux signaux lumineux entre les deux polariseurs sont en outre mis en rotation par des éléments (8) de mise en rotation, en sens contraires sur un angle de rotation prédéterminé. Un signal de mesure (M) indépendant de vibrations et d'influences de flexion des fibres optiques est dérivé de l'intensité (I1, I2) des deux signaux lumineux (L1, L2) après leur passage à travers le circuit série.

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