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MRS (magnetic resonance sounding) FID (frequency identity) signal noise inhibition method

A nuclear magnetic resonance, signal-to-noise technology, used in magnetic resonance measurement, measurement using an MRI imaging system, measurement using magnetic variables, etc.

Inactive Publication Date: 2015-07-15
JILIN UNIV
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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a noise suppression method for nuclear magnetic resonance sounding FID signal, aiming at providing a brand-new modern filtering method to suppress the noise of nuclear magnetic resonance sounding FID signal, so as to solve the problem of nuclear magnetic resonance sounding under strong electromagnetic interference. Efficient Extraction of Deep Signals

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  • MRS (magnetic resonance sounding) FID (frequency identity) signal noise inhibition method
  • MRS (magnetic resonance sounding) FID (frequency identity) signal noise inhibition method
  • MRS (magnetic resonance sounding) FID (frequency identity) signal noise inhibition method

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[0068] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0069] Noise suppression method for nuclear magnetic resonance sounding FID signal based on principal component analysis and empirical mode decomposition, refer to figure 1 The flow chart includes the following steps:

[0070] a. First, perform spectrum analysis on the signal detected by the magnetic resonance sounding system, compare the relationship between the signal receiving frequency and the current transmitting frequency, confirm that the detected signal is the magnetic resonance signal E(t) in groundwater, and then use normalization The digital quadrature detection technology decomposes th...

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Abstract

The invention relates to an MRS (magnetic resonance sounding) FID (frequency identity) signal noise inhibition method. The method comprises steps as follows: a signal detected by an MRS system is subjected to spectral analysis, the detected signal is decomposed into a homonymous component X and a quadrature component Y with a normalization quadrature detection technology, and a low-frequency FID signal is obtained through hardware filtering processing; peak noises of the components X and Y in the FID signal are rejected from acquired data respectively with a non-linear energy operator algorithm; preliminary signal and noise separation is performed on the components X and Y respectively on the basis of a PCA (principal component analysis) method; the components X and Y processed with the PCA method are further decomposed on the basis of an EMD (empirical mode decomposition) method, and a signal trend term is extracted; the components X and Y processed with the EMD method are superimposed and averaged, and an e index curve is obtained. The problems including high probability of loss of signal components with a conventional filtering means and the like are completely solved, and various complicated noises included in the MRS FID signal are effectively inhibited.

Description

technical field [0001] The invention relates to signal processing in the field of nuclear magnetic resonance, in particular to a noise suppression method for nuclear magnetic resonance sounding FID signals based on principal component analysis and empirical mode decomposition. Background technique [0002] Magnetic resonance sounding (Magnetic resonance sounding, MRS), as a geophysical method to directly detect groundwater, uses the relaxation characteristics of hydrogen protons in water to detect groundwater, and has been used in groundwater exploration, hydrogeological survey and landslide stability. It has been applied in evaluation, dam leakage, old empty water detection in coal mines and advanced detection and early warning of water inrush in tunnels. With the advancement of science and technology, after more than ten years of development, the instrument systems that have been commercialized include the NUMIS system, NUMISplus system, and NUMISpoly system of the French ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/54
Inventor 田宝凤王悦谢燕妮李振宇周媛媛訾彦勇
Owner JILIN UNIV
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