Multicomponent transient electromagnetic method in coal mine hole

Abstract

The present invention relates to a multicomponent transient electromagnetic method in a coal mine hole. A magnetic probe is used to receive a secondary field generated by a geologic body, the secondary field is amplified by a receiving signal conditioning circuit and then is sent to an ADC (Analog-Digital Converter) to conduct digital to analog conversion, and then the inversion calculation of a data processing platform is conducted. The magnetic probe comprises a magneto sensor and a low-noise operational amplifier circuit, and the magneto sensor is connected with the low-noise operational amplifier circuit and is then connected to the input terminal of the receiving signal conditioning circuit of a receiver through a cable. By the adoption of the multicomponent transient electromagnetic instrument probe in the coal mine hole, the human interference field during the operation of electrical equipment on a roadway, head-on and a working surface outside the geologic body is avoided; and the secondary filed from different directions can be received so as to carry out the three-dimensional data inversion of the geologic body more really.

Description

technical field [0001] The invention relates to a mine geophysical prospecting method, in particular to a multi-component transient electromagnetic method in a coal mine underground hole. Background technique [0002] The transient electromagnetic method sends a transient primary field to the geological body through a transmitting coil. This rapidly decaying electric field induces a new eddy current field (secondary field) in the geological body, and the magnetic probe receives the change characteristics of the secondary field to reflect Geological and electrical characteristics. The main advantage of the transient electromagnetic method is that it is convenient for construction and the effect is clear. Its main disadvantages are as follows: [0003] 1. In the transient electromagnetic method, the interference signals are mainly natural electromagnetic field noise and human interference, which are also called background fields. Under the coal mine, because the human interf...

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Problems solved by technology

Under the coal mine, because the human interference field when the electrical equipment is running will seriously interfere with the detection of the transient electromagnetic instrument, it is difficult for the receiving coil to avoid interference;

[0004] 2. There is only one component of the secondary field signal received by the receiving coil, and the orientation is single. Multiple multi-directional detections are required to form real three-dimensional data

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