Nuclear magnetic resonance underground water detection signal noise eliminating method based on independent component analysis (ICA)

A technology of nuclear magnetic resonance and detection signals, which is applied in electron magnetic resonance/nuclear magnetic resonance detection, electric/magnetic exploration, geophysical measurement, etc., and can solve problems that affect detection accuracy, residual, and noise

Active Publication Date: 2015-05-13
JILIN UNIV
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Problems solved by technology

It is to collect two sets of MRI signals in opposite directions and noise signals in the same direction respectively, and eliminate the noise by subtraction method, but this method cannot guarantee that the noise of the two acquisitions is exactly the same, and there will be noise residues, which will affect the detection accuracy

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  • Nuclear magnetic resonance underground water detection signal noise eliminating method based on independent component analysis (ICA)
  • Nuclear magnetic resonance underground water detection signal noise eliminating method based on independent component analysis (ICA)
  • Nuclear magnetic resonance underground water detection signal noise eliminating method based on independent component analysis (ICA)

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Embodiment Construction

[0049] figure 1 It is a working flow chart of the ICA-based method for eliminating power-frequency harmonic noise of nuclear magnetic resonance groundwater detection signals. Aiming at the interference of power frequency harmonics in the NMR groundwater detection, by constructing the sine function and cosine function with the same frequency as the power frequency harmonics, and composing the observation signal with the NMR response signal, the observation signal is separated by using the ICA algorithm. And the method of data reconstruction is used to solve the problem of amplitude attenuation in the process of ICA separation.

[0050] figure 2 It is a working block diagram of using the ICA algorithm to eliminate the random noise of the nuclear magnetic resonance groundwater detection signal after removing the power frequency noise. The three sets of nuclear magnetic resonance data after removing the power frequency noise are used as observation signals, processed by the ICA ...

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Abstract

The invention discloses a nuclear magnetic resonance underground water detection signal noise eliminating method. The method comprises the steps of: recoding response data entry three groups, each of these three sets of data Fourier transform nuclear magnetic resonance to determine the frequency of the data center in each neighborhood contains frequency harmonics, and frequency harmonic structure and the same frequency, and magnetic resonance corresponding data with sine function of the length of the cosine function, and composition and magnetic resonance response data observed signal using independent component analysis for each group observed signals to separate the mixed signal obtained solution for data reconstruction to eliminate frequency harmonic interference, the three groups of removing harmonic frequency data as observational signals, and then use algorithm processing, weaken the remaining random noise. The invention is to eliminate harmonic frequency noise at the same time, the signal will not destroy any details, without laying a reference coil, simple operation, suppress random noise does not require a lot of data, reducing the processing time.

Description

Technical field: [0001] The invention relates to a nuclear magnetic resonance data preprocessing method, in particular to a nuclear magnetic resonance groundwater detection signal noise elimination method based on independent component analysis (ICA). Background technique: [0002] There are many ways to find and evaluate underground freshwater resources. The conventional geophysical prospecting method is to find water indirectly by exploring the layers of water-bearing structures, which cannot solve some basic problems closely related to groundwater, such as where there is water and how much water there is. , NMR groundwater detection technology, as the only geophysical method to directly detect groundwater, has the advantages of rich information and unique solution. However, the nuclear magnetic resonance signal is extremely weak, and the nuclear magnetic resonance detection instrument inevitably receives complex noise interference while receiving the nuclear magnetic reso...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V3/14G01V3/38
Inventor 林婷婷张思远张扬万玲蒋川东林君
Owner JILIN UNIV
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