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Bipolar triangular wave transient electromagnetic transmitting system

A transient electromagnetic and transmitting system technology, used in radio wave measurement systems, re-radiation of sound waves, and electrical/magnetic exploration, etc. problem, to achieve the effect of overcoming excessive power consumption and simple magnetic field

Inactive Publication Date: 2018-05-04
INST OF ELECTRONICS CHINESE ACAD OF SCI
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Problems solved by technology

But one of the biggest disadvantages of Off-Time observation is that due to the large time constant of the high-conductivity target, the eddy current attenuation is very slow, and the induced secondary field is very weak, and the high-conductivity target is the most valuable high-grade material for development. Bonanza

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  • Bipolar triangular wave transient electromagnetic transmitting system
  • Bipolar triangular wave transient electromagnetic transmitting system
  • Bipolar triangular wave transient electromagnetic transmitting system

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Embodiment Construction

[0025] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0026] Certain embodiments of the invention will be described more fully hereinafter with reference to the accompanying drawings, in which some, but not all embodiments are shown. Indeed, various embodiments of the invention may be embodied in many different forms and should not be construed as limited to these set forth embodiments; rather, these embodiments are provided so that this invention will satisfy applicable legal requirements.

[0027] In an exemplary embodiment of the present invention, a bipolar triangular wave transient electromagnetic emission system is provided. figure 1 It is a topological structure diagram of the main circuit of the bipolar triangular wave transient electromagnetic emission system of the...

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Abstract

The invention provides a bipolar triangular wave transient electromagnetic transmitting system, which comprises a power module, a high voltage generation circuit module, a transmitter H inverter bridge module, a passive constant-voltage clamping circuit module, a load coil parameter control circuit module and an overshoot suppression circuit module. The transmitter H inverter bridge module comprises an H bridge circuit formed by switching elements, and the generation of a bipolar triangular wave current pulse is realized through controlling the switch-on and the switch-off of the switching elements in the H bridge circuit; the passive constant-voltage clamping circuit module is used for producing clamping high voltage during a current reduction process so as to quickly switch off current linearity and form a falling edge of the triangular wave current pulse; the load coil parameter control circuit module is used for changing an overall inductance value through selecting an inductance value of a controlled inductance so as to change the rising time of a rising edge of a bipolar triangular wave. The bipolar triangular wave transient electromagnetic transmitting system provided by theinvention realizes ground exploration and depth detection of On-Time detection.

Description

technical field [0001] The invention relates to the technical field of transient electromagnetic emission, in particular to a bipolar triangular wave transient electromagnetic emission system. Background technique [0002] Transient electromagnetic method is also called time-domain electromagnetic method, or TEM for short. It uses an ungrounded return line or a grounded line source to emit a pulsed magnetic field underground. method. This method can identify water-bearing geology such as karst caves and passages, coal mine goafs, and deep irregular water bodies. [0003] Transient electromagnetic emission system commonly used emission current waveforms are bipolar square wave, bipolar trapezoidal wave, bipolar sine wave and bipolar triangular wave. [0004] For low-conductivity targets, the response of a pulsed magnetic field excitation with the same waveform has similar amplitudes during the On-Time period and the Off-Time period without the emission current. Among the fo...

Claims

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Application Information

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IPC IPC(8): G01V3/08
CPCG01V3/083G01V2003/084
Inventor 刘丽华赵逸夫耿智刘雷松刘小军
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI
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