Systems and methods for active cancellation of transient signals and dynamic loop configuration

Abstract

A method and system for active cancellation of transient signals and dynamic loop configuration for geophysical exploration is disclosed. The method includes controlling a transmitter to transmit a waveform in a frequency spectrum during an on-time. The transmitter includes a plurality of turns of wire. The method also includes controlling a plurality of switches to direct an electrical signal through the plurality of turns of wire. The plurality of switches electrically coupled to the plurality of turns of wire. The method further includes controlling a switch of the plurality of switches to direct a first portion of a transient current in an opposite direction from a direction of a second portion of the transient current during an off-time.

What is claimed is: 
     
         1 . An electromagnetic geophysical exploration method comprising:
 controlling a transmitter to transmit a waveform in a frequency spectrum during an on-time, the transmitter including a plurality of turns of wire;   controlling a plurality of switches to direct an electrical signal through the plurality of turns of wire, the plurality of switches electrically coupled to the plurality of turns of wire; and   configuring the plurality of switches to direct the electrical signal in one of a series loop configuration or a parallel loop configuration.   
     
     
         2 . The method of  claim 1 , further comprising reconfiguring the plurality of switches to direct the electrical signal in a series loop configuration from aparallel loop configuration. 
     
     
         3 . The method of  claim 1 , further comprising reconfiguring the plurality of switches to direct the electrical signal in a parallel loop configuration from a series loop configuration. 
     
     
         4 . An electromagnetic geophysical exploration system comprising:
 a transmitter including a plurality of turns of wire;   a plurality of switches electrically coupled to the plurality of turns of wire;   a control system configured to:
 control the transmitter to transmit a waveform in a frequency spectrum during an on-time; 
 control the plurality of switches to direct an electrical signal through the plurality of turns of wire; and 
 configure the plurality of switches to direct the electrical signal in one of a series loop configuration or a parallel loop configuration. 
   
     
     
         5 . The system of  claim 4 , wherein the control system is further configured to reconfigure the plurality of switches to direct the electrical signal in a series loop configuration from a parallel loop configuration. 
     
     
         6 . The system of  claim 4 , wherein the control system is further configured to reconfigure the plurality of switches to direct the electrical signal in a parallel loop configuration from a series loop configuration.