Apparatus for airborne electromagnetic surveying

G - Physics – 01 – V

Patent

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Details

G01V 3/16 (2006.01) G01V 3/17 (2006.01) H01Q 1/08 (2006.01) H01Q 1/28 (2006.01)

Patent

CA 2187952

In systems carried by aircraft that transmit and receive electromagnetic fields for geophysical exploration, it is known to mount transmitting antennae on an aircraft or other rigid structure attached to or towed beneath an aircraft. In every case, the area of the transmitting antenna is limited by the dimensions of the rigid structure, which limits the dipole-moment of the antenna and thus the strength of the signal received by the system. This limitation is particularly severe for systems using antennae in towed structures. The present invention consists of a system that incorporates an airborne electromagnetic transmitting antenna with flexible area. Before take-off and during landing, the area of the antenna may be collapsed for safety and convenience. In flight, the antenna assumes a large and stable area, which induces strong electromagnetic responses from conductive features in the earth.

Dans les systèmes aéroportés qui émettent et captent des champs électromagnétiques pour l'exploration géophysique, il faut monter les antennes émettrices sur un aéronef ou sur une structure rigide fixée à un aéronef ou remorquée sous celui-ci. Dans chaque cas, l'aire de l'antenne émettrice est limitée par les dimensions de la structure rigide, ce qui limite le moment dipolaire de l'antenne et, par conséquent, l'intensité du signal capté par le système. Cette limitation est particulièrement prononcée dans les systèmes utilisant des antennes montées sur des structures remorquées. La présente invention est un système utilisant une antenne émettrice aéroportée à aire variable. Avant l'envol et durant l'atterrissage, l'antenne peut être ployée pour des raisons de sécurité et des raisons pratiques. En vol, elle est déployée et offre une aire stable de grandes dimensions, ce qui procure une grande sensibilité de réponse aux éléments conducteurs enfouis dans la terre.

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