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Method for improving signal-to-noise ratio of mine micro-seismic detector

A detector and signal-to-noise ratio technology, which is applied in the field of improving the signal-to-noise ratio of mine-use microseismic detectors, can solve the problems of unknown signal frequency and amplitude, signal noise reduction, and increase the difficulty of interference noise, so as to achieve random noise, improve The effect of the signal-to-noise ratio

Active Publication Date: 2014-06-11
BEIJING GENERAL RES INST OF MINING & METALLURGY
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Problems solved by technology

However, the method of reliable installation can only reduce the attenuation of the transmission process of the microseismic signal to the geophone, and the noise and the signal are transmitted without attenuation at the same time in this process, which does not play a role in suppressing random noise; and through signal processing , the interference noise cannot be suppressed from the source of the signal acquisition, and the frequency and amplitude of the signal picked up by the microseismic detector are unknown, so it is impossible to accurately set the threshold value and filter method to reduce the noise of the signal; in addition, the subsequent signal processing process will be The introduction of the background noise of other equipment in the microseismic monitoring system further increases the difficulty of effective signal extraction
Therefore, this not only increases the difficulty of subsequent suppression of interference noise, but also makes it difficult to better suppress interference noise

Method used

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  • Method for improving signal-to-noise ratio of mine micro-seismic detector
  • Method for improving signal-to-noise ratio of mine micro-seismic detector
  • Method for improving signal-to-noise ratio of mine micro-seismic detector

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Embodiment 1

[0041] figure 1 It is a flowchart of a method for improving the signal-to-noise ratio of a mine-used microseismic geophone provided by Embodiment 1 of the present invention. Such as figure 1 As shown, the method mainly includes the following steps:

[0042]Step 11, install n+1 geophone sensitive units in the direction of maximum sensitivity of the geophone sensitive units in the mine microseismic geophone letter.

[0043] In the embodiment of the present invention, in order to improve the ability to pick up seismic source signals with unknown parameter information such as energy and frequency, the application cost of superimposing geophones in the field of seismic exploration is reduced due to superposition by sensitive units inside the geophones. Moreover, from the perspective of space, the number of acquisition channels of vibration signals in the same direction is increased, and the channel signal samples are increased. By analyzing the correlation of channel signals in t...

Embodiment 2

[0061] In order to facilitate understanding of the present invention, below in conjunction with Figure 2-3 for further clarification.

[0062] The structure of the microseismic geophone mainly includes the geophone sensitive unit, the protective shell, the internal structure frame and the connecting terminal. According to the installation structure of the internal geophone sensitive unit, it can be divided into single-component geophone and three-component geophone, also known as Single-axis geophones and triaxial geophones. The main differences between the two are:

[0063] 1) There is only one sensor sensitive unit inside the single-component detector;

[0064] 2) There are three sensor sensitive units inside the three-component detector, and the fixed orientation constitutes three coordinate axes in the coordinate system.

[0065] The sensitivity of the geophone sensitive unit to sense external vibration signals is directional, that is, the geophone sensitive unit has t...

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Abstract

The invention discloses a method for improving the signal-to-noise ratio of a mine micro-seismic detector. The method includes the steps that n+1 detector sensing units are installed in the mine micro-seismic detector in detector sensing unit maximum sensitivity directions; the frequency spectrum correlation of n+1 channel signals in the same direction is analyzed, effective signals are extracted, and suppression on random noise is achieved; mean value noise reduction is carried out on oversampling data of the same detector sensing unit through the non-correlation of the random noise by setting the oversampling rate of each signal detector sensing unit so as to improve the signal-to-noise ratio. By means of the method, the capacity for picking up unknown source signals of parameter information such as energy and frequency is improved, interference caused by the random noise is effectively suppressed, and the signal-to-noise ratio is improved.

Description

technical field [0001] The present invention relates to the technical field of mine safety application, in particular to a method for improving the signal-to-noise ratio of a mine-used microseismic geophone. Background technique [0002] During mining, after the excavation of the rock mass, the stress balance state of the original rock is destroyed, and the stress in the rock mass is redistributed, resulting in the deformation, movement and destruction of the surrounding rock, causing the rock formation to collapse, which seriously threatens the safety of the mine workers. The entire process of deformation and failure of mine rock mass is almost accompanied by the generation, expansion, and friction of cracks, and the accumulated energy is released during the process of releasing microseismic events. The microseismic events are collected by the geophones (sensors) installed in different positions of the rock mass in the mine microseismic monitoring system, and converted into...

Claims

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Application Information

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IPC IPC(8): G01V1/18
Inventor 杨小聪冀虎张达刘冠洲
Owner BEIJING GENERAL RES INST OF MINING & METALLURGY
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