A ground nuclear magnetic resonance signal peak noise removal method based on a model

A ground nuclear magnetic resonance and spike noise technology, which is applied in the fields of electronic magnetic resonance/nuclear magnetic resonance detection, biological neural network model, character and pattern recognition, etc., can solve the problem that it is difficult to extract effective ground nuclear magnetic resonance signals due to spike noise

Active Publication Date: 2019-06-14
JILIN UNIV
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Problems solved by technology

[0009] The technical problem to be solved by the present invention is to provide a model-based ground nuclear magnetic resonance signal spike noise removal method to solve the problem that it is difficult to extract effective ground nuclear magnetic resonance signals due to the presence of spike noise

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  • A ground nuclear magnetic resonance signal peak noise removal method based on a model
  • A ground nuclear magnetic resonance signal peak noise removal method based on a model
  • A ground nuclear magnetic resonance signal peak noise removal method based on a model

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Embodiment

[0132] This embodiment is a simulation experiment of the method of the present invention carried out under the MATLAB2015b programming environment.

[0133] Step (1): Construct a simulated terrestrial NMR signal with X 1 (t) means, if figure 2 As shown, the signal can be decomposed into four parts:

[0134] x 1 (t)=NMR(t)+h(t)+sp(t)+w(t) (10)

[0135] where NMR(t) represents the pure NMR signal:

[0136]

[0137] In equation (14), Larmor frequency: f l =2326Hz, amplitude: E 0 =200nV, relaxation time: T 2 =200nV; h(t) is the power line harmonic noise:

[0138]

[0139] sp(t) represents spike noise, and the specific parameter settings are as in step (3).

[0140] w(t) represents random noise, where 5dB of random white noise is added.

[0141] Step (2): For X obtained in step (1) 1 (t) Use the harmonic modeling method to remove power frequency harmonics. The identification result of harmonic modeling is: center frequency: 50.01Hz, and X 2 (t), such as image 3 ...

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Abstract

The invention relates to a ground nuclear magnetic resonance signal noise filtering method based on a model, which is mainly used for filtering the peak noise in a nuclear magnetic resonance signal. The method comprises the steps of firstly, collecting an MRS signal by using a nuclear magnetic resonance water detector, and removing the power frequency harmonics by using a harmonic modeling method;secondly, establishing a peak noise model through two second-order cascade band-pass filters, and meanwhile, positioning the position of the peak noise by adopting an NEO algorithm and intercepting corresponding data segments; and then, performing parameter extraction based on a least square method to obtain peak noise, aand finally, subtracting the MRS data from which the power frequency harmonic waves are removed from the peak noise obtained by modeling to obtain an MRS signal from which the peak noise is removed. According to the method, the problem of removing the peak noise in the MRS signal is solved, and compared with a traditional MRS peak signal denoising method, the method has the advantages of being high in practicability, obviously improving the working efficiency, improving the signal-to-noise ratio and the like.

Description

technical field [0001] The invention belongs to the field of surface nuclear magnetic resonance (Surface Nuclear Magnetic Resonance, SNMR), also known as the field of noise filtering of magnetic resonance sounding (Magnetic Resonance Sounding, MRS) signals, specifically a model-based scheme from surface nuclear magnetic resonance signals Method for removing spike noise. Background technique [0002] Surface Nuclear Magnetic Resonance (SNMR), also known as Magnetic Resonance Sounding (MRS) technology is a non-invasive, direct and quantitative geophysical method developed in recent years to detect groundwater. The basic principle is to realize the detection of groundwater by detecting the nuclear magnetic resonance signal generated by the resonance transition of hydrogen protons in the groundwater. The expression of the NMR signal is: [0003] [0004] In formula (1), E 0 Indicates the initial amplitude of the surface NMR signal, which is related to the water content of ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50G06K9/00G01V3/14G06N3/04
CPCY02A90/30
Inventor 田宝凤李哲纪志豪王春露
Owner JILIN UNIV
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