NGU TFEM. A Time- and Frequency-domain ElectroMagnetic instrument. System documentation.

Abstract

The report introduces the NGU TFEM time- and frequency-domain electromagnetic system developed at the Geological Survey of Norway. A general description of the system design, and a more specific description of the receiver-coil system, the receiver, the transmitter and the power supply units is given. The report does not include details of the theory, the hardwares and the programs. This report was compiled after some improvements at the system made in 1987, and it replaces an earlier documentation (NGU Report 86.164).