Electromagnetic surveying

Details Electromagnetic surveying Electromagnetic surveying

G - Physics

01

V

G01V 3/12 (2006.01)

Patent

CA 2534111

A submersible electromagnetic (EM) field generator (5) for seafloor electromagnetic surveying comprising an AC to DC converter (18) operable to generate a DC output from an AC input and a switching module (19) operable to generate a waveform driving signal by selectively switching the DC output. The EM field generator also comprises an antenna (20) that is operable to generate an EM field in response to the waveform driving signal. This design approach of using a switched DC source allows square or rectangular wave EM signals to be generated which have sharp transition characteristics and which are substantially independent of the AC input characteristics.

Générateur de champ (5) électromagnétique (EM) submersible pour inspection électromagnétique de fonds sous-marins comprenant un convertisseur CA/CC (18) pouvant générer une sortie CC depuis une entrée CA et un module de commutation (19) capable de générer un signal d'entraînement de forme d'ondes en commutant sélectivement la sortie CC. Le générateur de champ EM comprend également une antenne (20) capable de générer un signal moteur de forme d'ondes. Cette approche de conception d'utilisation d'une source CC commutée permet la génération de signaux EM d'ondes rectangulaires ou carrées qui ont des caractéristiques de transition aiguës et qui sont essentiellement indépendantes des caractéristiques d'entrée CA.

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