Method for detection and compensation of eddy currents

A - Human Necessities – 61 – B

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A61B 5/06 (2006.01) G01N 27/90 (2006.01) G01R 33/565 (2006.01)

Patent

CA 2521537

A distortion compensation method includes determining an undisturbed phase for at least one of a first position indication signal and a second position indication signal. The method includes determining an undisturbed ratio that relates the amplitude of the first position indication signal at a first frequency to the amplitude of the second position indication signal at a second frequency. The method also includes determining a disturbed amplitude of the position indication signal and adjusting a position indication based on the disturbed amplitude and phase, the undisturbed amplitude ratio, and the undisturbed phase. The method further comprises determining a relationship between the eddy current phase of the first position indication signal and the second position indication signal.

La présente invention a trait à un procédé de compensation de distorsion comprenant la détermination d'une phase non perturbée pour au moins un parmi un premier signal d'indication de position et un deuxième signal d'indication de position. Le procédé comprend la détermination d'un rapport non perturbé entre l'amplitude du premier signal d'indication de position à une première fréquence et l'amplitude du deuxième signal d'indication de position à une deuxième fréquence. Le procédé comprend également la détermination d'une amplitude perturbée du signal d'indication de position et le réglage d'une indication de position en fonction des amplitude et phase perturbées, du rapport d'amplitude non perturbé et de la phase non perturbée. Le procédé comprend en outre la détermination de la relation entre la phase de courants de Foucault du premier signal d'indication de position et du deuxième signal d'indication de position.

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