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
CN102749655AInactive Publication Date: 2012-10-24FUZHOU HUAHONG INTELLIGENT TECH
2 Cites 12 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
FUZHOU HUAHONG INTELLIGENT TECH
Publication Date
2012-10-24
Estimated Expiration
Not applicable · inactive patent

Smart Images

  • Figure 1
    Figure 1
Patent Text Reader

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.
Need to check novelty before this filing date? Find Prior Art

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...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More