Method and apparatus for detecting a magnetically responsive...

A - Human Necessities – 61 – B

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A61B 5/05 (2006.01) G01N 27/02 (2006.01) G01N 33/487 (2006.01) G01R 33/16 (2006.01)

Patent

CA 2278774

This invention is a method and apparatus for detecting in a sample a substance (18) which responds to an applied magnetic field, such as a paramagnetic substance. The sample is placed in a magnetic field, and the effect of the sample on a performance characteristic of an electrical conductor is correlated to the presence of the substance. The first conductor (12) is configured as a coil, and electromagnetic signal source (14) is a current source which applies a current to the first conductor (12). The sample (18) in sample holder (16) can have a measurable effect on the performance of the conductor (12). A measuring device (19) measures the value of a pre-selected performance characteristic of the coil (12). The value measured by the measuring device (19) may be displayed by the computer (30).

Cette invention se rapporte à un procédé et à un appareil permettant de détecter dans un échantillon une substance qui réagit à un champ magnétique appliqué, telle qu'une substance paramagnétique. On place l'échantillon dans un champ magnétique et l'on établit une corrélation entre la présence de la substance et l'effet qu'a l'échantillon sur une caractéristique de performance d'un conducteur électrique. Le premier conducteur (12) se présente sous la forme d'une bobine et la source de signaux électromagnétiques (14) est une source de courant qui délivre un courant au premier conducteur (12). L'échantillon (18) présent dans le porte-échantillon (16) peut avoir un effet mesurable sur la performance du conducteur (12). Un dispositif de mesure (19) mesure la valeur d'une caractéristique de performance préétablie de la bobine (12). La valeur mesurée par le dispositif de mesure (19) peut être affichée par un ordinateur (30).

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