| 摘要 |
<p>An objective is achieved by an airborne electromagnetic survey system configured for geophysical prospecting of an underground formation, which airborne electromagnetic survey system comprises a transmitter arrangement Tx comprising at least one current source connected to at least one transmitter coil arrangement covering an area A for generating a magnetic moment for building up a primary electromagnetic field inducing a secondary electromagnetic field in the underground formation and a switch arrangement comprising at least one switch inserted in between the at least one current source and the at least one transmitter coil arrangement. The switch arrangement is configured to connect the at least one current source with the at least one transmitter coil arrangement to build up a connecting secondary electromagnetic field, which connect is at a connection time at a connection voltage at a connection current. The switch arrangement is furthermore arranged to disconnect the at least one current source from the at least one transmitter coil arrangement to build up a disconnecting secondary electromagnetic field; which disconnect is at a disconnection time at a disconnection voltage at a disconnection current. The connecting secondary electromagnetic field and disconnecting secondary electromagnetic field provide a combined secondary electromagnetic field. The airborne geophysical prospecting system further comprises a receiver arrangement Rx comprising at least one receiver coil configured to receive the combined connecting and disconnecting secondary electromagnetic fields. The airborne electromagnetic survey system comprises multiple transmitter arrangements Tx generating a total secondary electromagnetic field comprising a sum of individual combined secondary electromagnetic fields.</p> |
