Method for eliminating electromagnetic interference signals of underground coalmine transient electromagnetic instrument

Abstract

The invention provides a method for eliminating electromagnetic interference signals of an underground coalmine transient electromagnetic instrument. The underground coalmine transient electromagnetic instrument comprises a high-speed ARM (advanced RISC machine) processor, a large-capacity memory, a high-speed 16-bit ADC (analog to digital converter), a receiving circuit and a receiving coil, wherein a transmitter consists of a transmitting circuit and a transmitting coil; and a receiver is connected with the transmitter through a communication cable to achieve synchronous control. The method provided by the invention can be used for rapidly and accurately eliminating the electromagnetic interference to obtain the accurate observation value of a secondary filed, thereby accurately eliminating the electromagnetic interference signals.

Description

technical field [0001] The invention relates to the field of geophysical exploration, in particular to a method for removing electromagnetic interference signals by a transient electromagnetic instrument in a coal mine. Background technique [0002] Transient electromagnetic method (TEM) is a new prospecting method with broad application prospects in the field of geophysical exploration, and it has been successfully applied to engineering exploration such as coal mines, metal mines, oil, and gas exploration. [0003] Coal mine underground transient electromagnetic instrument uses an ungrounded loop (transmitting coil) to generate an excitation source, and sends a primary field to the coal mine underground geological body. Under its excitation, the coal mine underground geological body will generate a secondary field that changes with time. In the primary field During the intermittent period, the secondary field is received by the receiving circuit (receiving coil). Since th...

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Problems solved by technology

However, the conventional method of removing electromagnetic interference signals will affect the accuracy of imaging. Therefore, research on how to remove electromagnetic interference signals, whether it is to enrich underground coal mine geophysical prospecting technology, or to promote the application of transient electromagnetic instruments in coal mines, to accurately locate the location of water, It is of great practical and theoretical significance to understand the hidden dangers of water inrush in advance, reduce or avoid the occurrence of water inrush accidents, and ensure the safety of coal mines.

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