Method for removing electromagnetic interference (EMI) signal by transient electromagnetic instrument background field guidance frequency-selecting technology

A technology of transient electromagnetic instrument and background field control, which is applied in the field of geophysical exploration and can solve problems such as strengthening

Inactive Publication Date: 2012-10-24
FUZHOU HUAHONG INTELLIGENT TECH
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Problems solved by technology

[0004] However, if the transmitted frequency is not an even multiple of 1 / 2 of the frequency of the background field interference signal, the background field interference signal will not be canceled after bipolar superposition, but will be strengthened

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  • Method for removing electromagnetic interference (EMI) signal by transient electromagnetic instrument background field guidance frequency-selecting technology

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Embodiment Construction

[0021] Now in conjunction with the accompanying drawings, the method for removing the electromagnetic interference signal by the background field guidance frequency selection technology of the coal mine underground transient electromagnetic instrument of the present invention is further elaborated:

[0022] see figure 1 , the coal mine underground transient electromagnetic instrument adopted in the method of the present invention comprises the transmitter 19 that transmitting circuit 15 and transmitting coil 18 form, the receiver 13 that receiving circuit 9 and receiving coil 14 form, receiver 13 and transmitter 19 use The cable 20 realizes synchronous control. The transmitting coil 18 and receiving coil 14 are ungrounded loops, superimposed on the underground geological body (coal seam or surrounding rock) of the coal mine, and the transmitting coil 18 and receiving coil 14 are respectively connected to the transmitting circuit 15 and the receiving circuit 9 .

[0023] When ...

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Abstract

The invention provides a method for removing an electromagnetic interference (EMI) signal by a coal mine underground transient electromagnetic instrument background field guidance frequency-selecting technology; a coal mine underground transient electromagnetic instrument adopted in the method comprises a receiver consisting of a central processing unit (CPU), a memory, an analog/ digital converter (ADC), a receiving circuit and a receiving coil, and a transmitter consisting of a transmission circuit and a transmitting coil; and the receiver is connected with the transmitter by a communication cable for realizing synchronous control. According to the method, a spectrum analysis method is firstly used for analyzing the frequency of the maximum amplitude of the EMI signal of the background field, and then the frequency transmitted by the transient electromagnetic instrument is guided according to the measured frequency of the maximum amplitude of the EMI signal of the background field, so that the EMI can be rapidly and accurately eliminated, accurate observed value of the secondary field can be obtained, and the aim of accurately eliminating the EMI signal can be achieved.

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] But under normal circumstances, the transient electromagnetic response in the deep part of the geological body will be submerged in the noise, and the most concerned about in the transient electromagnetic detection method is how to obtain the effective signal in the deep part. In the transient electromagnetic method, the interference signals are mainly natural electromagnetic field noise and human interference, which are also called background fields. In coal m...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V3/38
Inventor 林晓许能清王本雄陈锋
Owner FUZHOU HUAHONG INTELLIGENT TECH
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