High sensitivity optical magnetic field sensors

G - Physics – 01 – R

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G01R 33/032 (2006.01)

Patent

CA 2024036

A high sensitivity optomagnetical sensor comprising a light source, a magnetic field-detecting section, a light-receiving section for receiving light emitted from the light source through the magnetic field-detecting section, a measurement-controlling section for controlling the light source, the magnetic field-detecting section, and the light-receiving section, and for measuring an intensity of light received by the light-receiving section, and light transmission paths using optical fibers for optically connecting the light-source section and the magnetic field-detecting section and optically connecting the magnetic field-detecting section and the light-receiving section. The magnetic field-detecting section is constituted by a polarizer, an analyzer and a magnetooptical element arranged between the polarizer and the analyzer. A garnet type ferrite polycrystal is used as a magnetooptical element of the sensor. The ferrite polyarystal has a Verdet constant of not less than 1 deg/cm~Oe, a thickness of not less than 100 µm, a light transmittance of not less than 10%, a temperature dependency on detecting the magnetic field in a temperature range of -20 to +60°C being within ~1.0%, a magnetic field-detecting precision of not more than 1/10,000, and a composition of BixGdyYzFe5O12 (x + Y + Z = 3).

'invention est un capteur optomagnétique à grande sensibilité constitué d'une source lumineuse, d'un détecteur de champ magnétique, d'un récepteur de lumière servant à recevoir la lumière émise par la source lumineuse qui traverse le détecteur de champ magnétique, d'un contrôleur de mesure servant à commander la source lumineuse, le détecteur de champ magnétique et le récepteur de lumière, ainsi qu'à mesurer l'intensité de la lumière reçue par le récepteur de lumière, et de fibres optiques servant à relier optiquement la source lumineuse et le détecteur de champ magnétique d'une part et le détecteur de champ magnétique et le récepteur de lumière d'autre part. Le lecteur de champ magnétique comporte un polariseur et un analyseur, ainsi qu'un élément magnéto-optique monté entre le polariseur et l'analyseur. Un polycristal de ferrite du type grenat sert d'élément magnéto-optique dans le capteur. Le polycristal de ferrite a une constante de Verdet non inférieure à 1 degré/cm.

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