Electrostatic shielded probe

Details Electrostatic shielded probe Electrostatic shielded probe

G - Physics

01

V

G01V 3/10 (2006.01) G01R 1/067 (2006.01)

Patent

CA 2044745

The electrostatic shielded probe comprises an elongated inductive winding having opposite ends to receive an alternating electric signal, and an active electrostatic shield having a conductive plate positioned alongside a portion of the winding. The conductive plate is electrically connected to a point on the winding that exhibits a potential substantially opposite to an average potential across the portion of the winding when the winding is subjected to the alternating electric signal. The conductive plate has a thickness adjusted to produce, in response to the potential applied thereto, an electric field substantially opposite to an electric field produced by the portion of the winding when the winding is subjected to the alternating electric signal, thereby resulting in a compensation and a substantial cancelling net effect of both electric fields. Additional like conductive plates can be positioned alongside other portions of the winding.

Une sonde à blindage électrostatique comprend un enroulement inducteur oblong dont les deux extrémités sont adaptées pour recevoir un signal électrique alternatif et un blindage électrostatique actif comportant une plaque conductrice placée le long d'une partie de l'enroulement. La plaque conductrice est raccordée à un point de l'enroulement affichant un potentiel sensiblement opposé à un potentiel moyen dans ladite partie de l'enroulement soumis à un signal électrique alternatif. La plaque conductrice a une épaisseur propre à produire, en réaction à la tension y appliquée, un champ électrique sensiblement opposé au champ électrique produit par ladite partie de l'enroulement soumis au signal électrique alternatif précité. Il en résulte un effet de compensation et l'annulation substantielle des deux champs électriques. D'autres plaques conductrices analogues peuvent être disposées le long d'autres parties de l'enroulement.

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