What do electromagnetic induction responses measure?
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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.
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