What do electromagnetic induction responses measure? Academic Article uri icon


  • In order to understand the role of the ground inductance L in shaping EMI responses, an experimental study involving a 7.5-cm radius circular loop of 12-gauge copper wire buried several cm within a loamy Texas agricultural soil was performed. The sophisticated and sensitive metal detector Geonics EM63 time-domain system was used to record EMI responses from about 100 μs to 25 ms following an abrupt shut-off in primary magnetic flux from the transmitter loop. Overall, results demonstrate that the EMI response depends largely on the existence of a closed conductive loops.

author list (cited authors)

  • Everett, M. E.

citation count

  • 8

publication date

  • February 2005