Method and apparatus for making quantitative measurements of...

G - Physics – 01 – N

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G01N 15/00 (2006.01) G01N 27/72 (2006.01) G01N 33/483 (2006.01) G01N 33/487 (2006.01) G01N 33/543 (2006.01) G01N 35/00 (2006.01)

Patent

CA 2311301

Apparatus for quantitatively measuring groups of magnetic particles. The particles are complexed with substances to be determined and are excited in a magnetic field. The magnetic particles (11) are thereby caused to oscillate at the excitation frequency in the manner of a dipole to create their own fields. These fields are inductively coupled to sensing coils (43) fabricated in a gradiometer configuration. The output signals from the sensing coils are appropriately amplified and processed to provide useful output indications.

On décrit un appareil pour effectuer des mesures quantitatives de particules magnétiques. Les particules sont complexées avec des substances à déterminer puis excitées dans un champ magnétique. Les particules magnétiques (11) sont ainsi agitées à la fréquence d'excitation à la manière d'un dipôle pour créer leurs propres champs. Ces champs sont reliés par couplage inductif à des bobines de détection (43) fabriquées dans une configuration du gradiomètre. Les signaux de sortie émis par les bobines de détection sont amplifiés et traités de manière appropriée pour donner des indications de sortie utiles.

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