Bipolar triangular wave generation system and method, transient electromagnetic emission system and method

Abstract

The invention relates to a bipolar triangular wave generation system and method, and a transient electromagnetic transmitting system and method. The bipolar triangular wave generation system is composed of a direct current-direct current conversion circuit and a voltage output circuit. The direct current-direct current conversion circuit consists of a direct-current power supply and a voltage conversion circuit; and the voltage output circuit includes a micro control chip, a digital-to-analog conversion circuit, a power amplifying circuit and a load coil that are connected in sequence. The voltage conversion circuit covers the direct-current power supply into a positive-negative-polarity dual-power supply unit to provide power for the voltage output circuit; a digital voltage signal generated by the micro control chip is processed by the digital-to-analog conversion circuit and the power amplifying circuit and then a bipolar triangular wave pulse current is formed on the load coil; andthen the load coil transmits a pulse magnetic field to the underground. According to the invention, on the basis of the novel topological structure, the bipolar triangular wave is generated; the generated one-time pulse magnetic field is simple; and On-Time acquisition can be carried out on a secondary pulse magnetic field generated by the excitation. The bipolar triangular wave generation systemand method, and a transient electromagnetic transmitting system and method are suitable for the shallow surface detection.

Description

technical field [0001] The invention relates to the technical field of geological exploration, in particular to a bipolar triangular wave generation system and method, and a transient electromagnetic emission system and method. Background technique [0002] The transient electromagnetic method is also called the time-domain electromagnetic method, or TEM for short. It uses an ungrounded coil or a grounded wire source to transmit a pulsed magnetic field underground, and uses a coil or a grounded electrode to receive and observe the secondary eddy current field during the interval of a pulsed magnetic field. Methods. This method can identify underground geological structures, such as mineral areas, karst caves and passages, coal mine goafs, and deep irregular water bodies. [0003] The commonly used emission field sources for transient electromagnetic emission systems are bipolar square wave, bipolar trapezoidal wave, bipolar sine wave and bipolar triangular wave. [0004] S...

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Problems solved by technology

[0005] At present, my country's transient electromagnetic emission waveform mainly adopts bipolar square wave or trapezoidal wave, and the observation time is Off-Time observation. There are few studies on transient electromagnetic emission systems that can generate bipolar triangular waves, let alone the Transient electromagnetic emission system that generates bipolar triangular waves is applied in On-Time detection

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