Double-coil coupled multi-wave exploration system

Abstract

The invention discloses a double-coil coupled multi-wave exploration system comprising a transmission control system. A first pulse signal output terminal group of the transmission control system is connected with a main transmitting coil and a second pulse signal output terminal group of the transmission control system is connected with a slave transmitting coil. The main transmitting coil and the slave transmitting coil are coupled coils and are overlapped. A receiving coil module is arranged at the edge of the main transmitting coil and the receiving coil module and the main transmitting coil are intersected partially; and the partial orthographic projection of the main transmitting coil and the partial orthographic projection of the receiving coil module are overlapped. The double-coil coupled multi-wave exploration system has the following beneficial effects: alternate detection of the deep part and the shallow part can be realized; for the shallow detection, the current turn-off time is short; the losses are low, the detection precision is high, and the work efficiency is high; the structure is simple and the mobility is high; the main transmitting coil and the receiving coil module are intersected partially and thus the mutual inductance influences between the main transmitting coil and the receiving coil are cancelled, so that the exploration precision is improved.

Description

technical field [0001] The invention relates to the technical field of transient electromagnetic detection, in particular to a double-coil coupled multi-wave survey system. Background technique [0002] Transient electromagnetic method is also called time domain electromagnetic method (TEM), which uses ungrounded return line or grounding line source to transmit a pulsed magnetic field to the ground. The method of observing the secondary eddy current field. Simply put, the basic principle of the transient electromagnetic method is the law of electromagnetic induction. The decay process is generally divided into early, middle and late stages. The early electromagnetic field is equivalent to the high-frequency component in the frequency domain, with fast attenuation and small skin depth; while the late component is equivalent to the low-frequency component in the frequency domain, with slow attenuation and large skin depth. The geoelectric characteristics at different depths...

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Problems solved by technology

[0004] At present, the main problems existing in domestic transient electromagnetic transmitters are: first, the delay of the magnetic field shutdown is too long, and the shallow detection information is seriously lost; second, the emission magnetic field is unstable, and the power supply system The power will drop, resulting in changes in the transmission waveform, poor quality of the received signal, and large detection errors; third, the detection depth is single, and it is impossible to take into account both shallow detection information and deep detection information

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