Electric field sensor

G - Physics – 01 – R

Patent

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Details

G01R 29/08 (2006.01) G01R 15/24 (2006.01)

Patent

CA 2144075

An electric field sensor comprises a sensor head, a package accommodating the sensor head, and an antenna attached to the outside of the package and connected to the sensorhead. The sensor head has a substrate and an optical modulator attached thereto. The optical modulator has an incident optical waveguide formed on the substrate, two phase-shift optical waveguides which are formed on the substrate to be branched from the incident optical waveguide and each of which has a variable refractive index varying in response to an electric field intensity applied thereto, an outgoing optical waveguide formed on the substrate to join the phase-shift optical waveguides, and two modulation electrodes formed on or in the vicinity of the phase-shift optical waveguides. The antenna has two rod antenna elements. The rod antenna elements extend in opposite directions with their one ends located at a center portion of the package and are arranged in parallel to the phase-shift optical waveguides. Alternatively, the antenna may have two film antenna elements and which are fixedly attached to aside surface of: the package, extend in opposite directions with their one ends located at the center portion, and ara arranged in parallel to the phase-shift optical waveguides. The film antenna elements may be fixedly attached to the substrate. A plurality of the optical modulators may be formed on the substrate and connected to the antennas, respectively.

L'invention concerne un capteur de champs magnétiques, équipé d'une tête de détection (1), d'un boîtier (13) abritant la tête (1) et d'une antenne (14) fixée au boîtier (13) et reliée à la tête (1). La tête (1) est constituée d'un substrat (3) sur lequel est monté un modulateur optique (4). Ce modulateur (4) est muni d'un guide d'ondes optiques d'entrée (5) se trouvant sur le substrat (3), de deux guides d'ondes optiques déphaseurs (6) dérivés du guide d'ondes (5) du substrat (3) et ayant des indices de réfraction variant en fonction du champ électrique utilisé, d'un guide d'ondes de sortie (7) relié aux guide d'ondes (6) se trouvant sur le substrat (3), et de deux éléctrodes de modulation (8) placées sur les guides d'ondes (6) ou à proximité de ces derniers. L'antenne (14) a deux éléments d'antenne tige (17 et 18) déployés parallèlement aux guides d'ondes (6) et dans des directions opposées à la partie centrale du boîtier (13). Il est possible de fixer l'antenne (14) sur la face latérale (21) du boîtier (21) et de constituer cette antenne (14) à partir des deux pièces à couche des éléments d'antenne (22 et 23) déployés parallèlement aux guides (6) et dans des directions opposées à la partie centrale de la face latérale (21). Les pièces à couche des éléments d'antenne (17 et 18) peuvent être fixées au substrat (3). Il est également possible de constituer sur le substrat un groupement de modulateurs optiques et de relier chaque antenne au modulateur correspondant.

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