Deep Earth detection by EM signals

The basis of the measurement is the reflected signal from the Earth in response to the injected electromagnetic (EM) waveform. The detection of natural resources (such as oil and gas) and pre-earthquake indications by EM signals was pioneered in Canada and the former USSR in 1958. Today this method is used worldwide. The transmitter generates the EM signal, by switching the current into a double pole. The shape of the EM signal determines the amount of information received in the reflected wave from the target area. Detection starts after decay of the transient in the double pole, which means that the transient time-constant should be minimal. The time response is determined principally by the inductive reactance of the double pole. To the best of our knowledge, no electric system that handles more than 200 amperes exists, because of the self induced voltage caused by the transient phenomena in the double pole. We suggest a new circuit to overcome the 200 ampere limit, and thus extend the detected depth.