Magneto-optical imaging method and device

Details Magneto-optical imaging method and device Magneto-optical imaging method and device

G - Physics

01

N

G01N 27/90 (2006.01) G01R 33/032 (2006.01)

Patent

CA 2530197

The invention relates to a quantitative magneto-optical imaging method and device which are used to form an image of a target material (2). According to the invention, an active material (15) is used in order to produce a Faraday rotation in a polarised light beam. Said material is placed close to the target material (2) that is to be imaged. The Faraday rotation of the active material (15) is essentially proportional to the magnetisation when it is subjected to an excitation magnetic field. Moreover, photo-detector means (7) detect the beam reflected after passing through the active material. The light from the reflected beam can then be analysed in order to deduce the amplitude and the phase of a disturbance magnetic field created by a defect in the target material (2) subjected to the excitation magnetic field.

Procédé et dispositif d'imagerie magnéto-optique quantitative, pour former une image d'un matériau cible (2). Un matériau actif (15) est utilisé pour engendrer une rotation Faraday dans un faisceau lumineux polarisé. Ce matériau est placé à proximité du matériau cible (2) à imager. La rotation Faraday de ce matériau actif (15) est sensiblement proportionnelle à l'aimantation magnétique lorsqu'il est soumis à un champ magnétique d'excitation. Des moyens photo-détecteurs (7), détectent le faisceau réfléchi après traversée du matériau actif. En analysant la lumière du faisceau réfléchi, on en déduit l'amplitude et la phase d'un champ magnétique de perturbation créé par un défaut dans le matériau cible (2), soumis au champ magnétique d'excitation.

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