Magnetic resonance denoising method and device based on modeling inverse recovery technology

An anti-recovery and magnetic resonance technology, which is applied in the direction of electronic magnetic resonance/nuclear magnetic resonance detection, measurement devices, and re-radiation of sound waves, can solve limitations and other problems, achieve strong noise suppression capabilities, avoid magnetic resonance signal distortion, high precision effect

Active Publication Date: 2018-07-06
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 magnetic resonance denoising method and device based on modeling anti-recovery technology, which solves the limitations of the traditional denoising method for detecting nuclear magnetic resonance signals due to the limitations of its own denoising method.

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  • Magnetic resonance denoising method and device based on modeling inverse recovery technology
  • Magnetic resonance denoising method and device based on modeling inverse recovery technology
  • Magnetic resonance denoising method and device based on modeling inverse recovery technology

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Embodiment

[0087] Use JLMRS (a nuclear magnetic resonance water detector developed by Jilin University) to collect a set of actual field noise. For quantitative analysis, add an artificially simulated magnetic resonance signal to the noise. The mathematical expression of the signal is e(t)=320exp( -t / 0.13) cos(2π×2330×t+30°). The signal-to-noise ratio after superimposing the signal and noise is -44.65dB, and the phase-locked amplification denoising method based on the modeling anti-recovery method proposed by the present invention is used for processing. Time-frequency domain waveforms of data containing signal and noise such as image 3 As shown, the signal is completely submerged in the noise.

[0088] Using the phase-locked amplification and denoising method based on modeling anti-recovery technology to process field data includes the following steps:

[0089] a. Select the parameters of the orthogonal vector lock-in amplifier: the reference signal frequency is f L = 2330Hz, order ...

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Abstract

The invention relates to the technical field of nuclear magnetic resonance groundwater detection, in particular to a magnetic resonance denoising method and device based on a modeling inverse recoverytechnology. The method comprises the steps that an acquired ground magnetic resonance signal and a reference signal are processed through an orthogonal vector type lock phase amplifier to obtain an output signal; the output signal processed by the orthogonal vector type lock phase amplifier is subjected to inverse recovery transformation to obtain an in-phase output signal and an orthogonal output signal; the collected ground magnetic resonance signal and the reference signal are multiplied and subjected to LPF filtering, and the orthogonal output signal is obtained through the inverse recovery transformation; all parameters of the magnetic resonance signal are extracted from the in-phase output signal and the orthogonal output signal. The problem of directly using the lock phase amplifier to cause distortion of the magnetic resonance signal is avoided. Compared with traditional magnetic resonance denoising methods, the denoising method can detect signals from a strong noise environment in one step.

Description

technical field [0001] The invention relates to the technical field of nuclear magnetic resonance groundwater detection, in particular to a magnetic resonance denoising method and device based on modeling anti-recovery technology. Background technique [0002] NMR groundwater detection technology is the only geophysical method that can directly detect groundwater. Although it has the advantages of qualitative and quantitative detection, the weak magnetic resonance signal and low signal-to-noise ratio are still the main bottlenecks that limit its wide application. Especially in strong noise environments such as urban suburbs and villages, noise interference seriously hinders the extraction of magnetic resonance signals, resulting in increased errors in later data inversion interpretation. [0003] CN102053280A discloses "NMR groundwater detection system and detection method with reference coil", which uses the correlation between the power frequency harmonic noise in the ref...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V3/14G01V3/38
CPCG01V3/14G01V3/38
Inventor 林婷婷张洋胡智能于振洋万玲
Owner JILIN UNIV
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