ELECTROMAGNETIC DEVICE FOR DETERMINING THE CONDUCTANCE OF A NEARBY BODY BY A SINGLE SUPERCOOLED INDUCTOR COIL

摘要

A towed electromagnetic prospecting device has a single inductor coil used for both transmitting and receiving secondary electromagnetic radiation from the ground which has been induced by the transmitted radiation. Such secondary fields from the ground are sensed as a change in the effective resistance of the superconducting inductive transmitter coil employed in the resonant resistance type bridge circuit.