Transient electromagnetic (tem) exploration system with adjustable compensation for primary field elimination

A transient electromagnetic (TEM) exploration system with adjustable compensation for primary field elimination, comprising a transmitting coil, a transmitter, a receiving coil, and a receiver, wherein the receiving coil is connected to the receiver;

• the transmitting coil is connected to the transmitter;
• the TEM exploration system further comprises a compensation mechanism;
• and the compensation mechanism comprises a current sensor, a compensation measuring coil, a compensating coil, and a compensating circuit;
• the current sensor is configured to detect a current of the transmitting coil, and output a transmitting current signal Vi to the compensating circuit;
• the compensation measuring coil is configured to detect all magnetic fluxes φ0 passing through the receiving coil, and output an induced voltage signal Vrx to the compensating circuit;
• and the magnetic fluxes φ0 comprise a transmitting magnetic flux φ1, a compensating magnetic flux φ2, and a geological responding magnetic flux φ3;
• the compensating circuit is configured to output a compensating current according to the transmitting current signal Vi and the induced voltage signal Vrx;
• and
• the compensating coil is configured to form the compensating magnetic flux φ2 according to the compensating current;
• and the compensating magnetic flux φ2 and the transmitting magnetic flux φ1 have a same magnitude and opposite directions.