Compact underwater electromagnetic measurement system

G - Physics – 01 – V

Patent

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Details

G01V 3/10 (2006.01) G01R 15/00 (2006.01) G01R 19/00 (2006.01) G01R 29/08 (2006.01) G01V 3/08 (2006.01) G01R 1/06 (2006.01) G01R 1/30 (2006.01) G01R 35/00 (2006.01) G01V 13/00 (2006.01)

Patent

CA 2670354

An underwater EM measurement system (100), which is substantially smaller, much simpler to use, and more robust than prior systems, is formed as a sensor package (200) integrated into a single pressure vessel (250) includes two magnetic sensors including induction coils (241-243) disposed substantially horizontally so as to measure fields in orthogonal directions. The package (200) also includes two electric field sensors including electric potential antennas (231-135) adapted to couple to a water (medium 4) potential via a capacitive electrode having a conducting material (1) and an electrically insulative layer formed of an insulating material (5). The capacitive electrode has a capacitance to the medium (4) of greater than 1 mF. Preferably, the insulating material (5) is a metal oxide.

L'invention concerne un système de mesure électromagnétique immergé (100) qui est sensiblement plus petit, plus simple à utiliser et plus robuste que les systèmes antérieurs. Ce système se présente sous la forme d'un ensemble (200) de capteurs intégré dans une seule enceinte sous pression (250), cet ensemble (200) comprenant deux capteurs magnétiques comportant des bobines d'induction (241-243) disposées sensiblement horizontalement de façon à mesurer des champs dans des directions orthogonales. L'ensemble (200) comprend également deux capteurs de champs électriques comportant des antennes à potentiel électrique (231-135) adaptées pour être connectées à un potentiel d'eau (milieu 4) par l'intermédiaire d'une électrode capacitive comprenant un matériau conducteur (1) et une couche électriquement isolante composée d'un matériau isolant (5). L'électrode capacitive présente une capacité par rapport au milieu (4) supérieure à 1 mF. Le matériau isolant (5) est de préférence un oxyde métallique.

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