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Detection method and detector for underground water source based on earth electromagnetic induction principle

A technology of electromagnetic induction and detection method, applied in geophysical measurement, electric/magnetic exploration, water resource assessment, etc. problem, to achieve the effect of high water finding accuracy, light weight and simple structure

Inactive Publication Date: 2010-05-05
湖南金宏源电子科技有限公司
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  • Application Information

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Problems solved by technology

The NMR detection method has a high success rate, but the detection depth is limited, and it is impossible to distinguish whether it is flowing water. At the same time, the equipment is expensive and bulky and is not suitable for field work
In addition, traditional geophysical instruments for finding water are complicated to use, requiring manual recording of each set of measurement data, and then drawing measurement curves based on the measurement data. Engineers with rich hydrogeological experience must judge whether there is water based on the measurement curves. Human factors account for a large proportion Large, when there are many measurement points, the amount of data is also quite large, and the task of manual analysis in the later stage is quite heavy

Method used

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  • Detection method and detector for underground water source based on earth electromagnetic induction principle
  • Detection method and detector for underground water source based on earth electromagnetic induction principle
  • Detection method and detector for underground water source based on earth electromagnetic induction principle

Examples

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example 1

[0060] Such as Figure 7 What is shown is a schematic diagram of the time-domain signal of the voltage difference U at a certain depth at a certain measuring point in the actual measurement. The 20-second discrete digitized "voltage difference U" signal realizes the FIR low-pass filtering of the software through the DSP chip of the software algorithm unit 8, then uses the adaptive filtering algorithm to lock and set the signal of the passband (i.e. depth), and then passes the formula U= R*I, the time-domain signal schematic diagram of the discrete digitized resistivity R value obtained in 20 seconds, such as Figure 8 . Use the FFT spectrum analysis algorithm to analyze the time-domain signal of the resistivity R value to obtain the frequency-domain signal. DSP finds out the ten kinds of frequency spectrum with the highest amplitude through the algorithm, and removes the spectrum with frequency components above 5 Hz to obtain the frequency-domain signal diagram, as shown in ...

example 2

[0062] Such as Figure 10What is shown is a schematic diagram of the time-domain signal of the voltage difference U at a certain depth at a certain measuring point in the actual measurement. The 20-second discrete digitized "voltage difference U" signal realizes the FIR low-pass filtering of the software through the DSP chip of the software algorithm unit 8, then uses the adaptive filtering algorithm to lock and set the signal of the passband (i.e. depth), and then passes the formula U= R*I, the time-domain signal schematic diagram of the discrete digitized resistivity R value obtained in 20 seconds, such as Figure 11 . Use the FFT spectrum analysis algorithm to analyze the time-domain signal of the resistivity R value to obtain the frequency-domain signal. DSP finds out the ten kinds of frequency spectrum with the highest amplitude through the algorithm, and removes the spectrum with frequency components above 5 Hz to obtain the frequency-domain signal diagram, as shown in ...

example 3

[0064] Such as Figure 13 As shown, what this figure represents is a certain example in the field measurement, measure a section, the length of the measurement section is 80 meters, the distance L length of each measurement induction probe set 11 is 10 meters, and the insertion depth is 15 centimeters . First measure at the first point (that is, 0 to 10 meters on the abscissa in the figure), and the depth required for measurement is 7 types: 40 meters to 75 meters, 75 meters to 110 meters, 110 meters to 145 meters, and 145 meters to 180 meters, 180 meters to 225 meters, 225 meters to 260 meters, 260 meters to 300 meters. Three frames of data are repeatedly measured for each depth, and the A / D conversion chip corresponding to each frame of data has a collection time of 20 seconds. First, measure the depth from 40 meters to 75 meters, and then measure from shallow to deep, until 260 meters to 300 meters. The meter section is measured. Then move the induction probe group to 10...

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Abstract

The invention relates to a detection method and a detector for underground water source based on an earth electromagnetic induction principle. The detection method comprises the following steps of: firstly, inserting an induction probe set into the surface of the earth, wherein the induction probe set comprises two induction probes; secondly, respectively collecting a voltage signal generated by the earth electromagnetic induction of the place in real time by the two induction probes; thirdly, carrying out band-pass filtering and low-pass filtering on a schematic diagram of time domain signals about voltage value difference U by utilizing the frequency f of a given pass band, and obtaining a schematic diagram of time domain signals of resistivity R and a schematic diagram of frequency domain signals with the frequency below 5 Hz; and fourthly, determining the underground water source in the area between the two induction probes when the frequency corresponding to the largest ten amplitude signals is below 5 Hz in the obtained schematic diagram of frequency domain signals with the frequency below 5 Hz. The water source detector comprises more than one induction probe set, a signal processing unit and a main controller. The invention has the advantages of simple and compact structure, portability, convenient operation, high accuracy, and the like.

Description

technical field [0001] The invention mainly relates to the field of water source detection, in particular to a water source detection method and device based on the principle of earth electromagnetic induction. Background technique [0002] At present, the ground geophysical prospecting methods include the electric method for finding water, the very low frequency method for measuring the magnetic component of the formation, and the nuclear magnetic resonance method. The common point of the electrical method and the very low frequency method of the magnetic component of the formation is to measure the comprehensive value of the physical properties of the geological body. The measurement results have multiple interpretations, and the judgment is based on the subjective experience of the measurer. The error is large, and the success rate of finding water is only 2% to 3%. ten. The nuclear magnetic resonance detection method has a high success rate, but the detection depth is l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V3/08
CPCY02A90/30
Inventor 石文明刘彦李新年
Owner 湖南金宏源电子科技有限公司
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