Patent ID: 8786286

Claim:
An electromagnetic measurement apparatus comprising: (a) a transmitter coil; (b) a bucking coil positioned substantially centrally within the transmitter coil; (c) a receiver coil positioned substantially centrally within the bucking coil; (d) a system of radial cables whereby the transmitter coil, bucking coil and receiver coil are connected in their relative positions; (e) an external suspension system of one or more external cables connected to the transmitter frame; and (f) one or more suspension attachment cables attached to the external suspension system; wherein the transmitter coil, bucking coil and receiver coil are positioned substantially concentrically relative to one another when the attachment cable is lifted vertically to a sufficient height to suspend the transmitter coil, bucking coil and receiver coil and the coils are positioned so as to function to achieve electromagnetic measurements to mitigate effects of residual currents in the transmitter coil during an off-time of the transmitter coil, the transmitter coil and the bucking coil each being flexible about a perimeter thereof wherein the transmitter coil, the bucking coil and the receiver coil are each supported within a respective transmitter coil frame, bucking coil frame and receiver coil frame that are spaced apart from each other and interconnected by the radial cables.