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Ground magnetic resonance signal rapid extraction device and method based on phase-locked amplifier technology

A magnetic resonance signal and phase-locked amplification technology, which is applied in the fields of electron magnetic resonance/nuclear magnetic resonance detection, climate sustainability, water resources assessment, etc., can solve the problems of fast extraction of difficult signals, weak signals, and low signal-to-noise ratio. Achieve the effects of improving detection sensitivity, suppressing saturation, and solving saturation

Active Publication Date: 2019-04-16
JILIN UNIV
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Problems solved by technology

However, the ground magnetic resonance signal is extremely weak, only nanovolt level, susceptible to noise interference, and the signal-to-noise ratio is low
Especially in areas with severe man-made noise interference, there will be problems with amplifier saturation and the inability to extract valid signals
[0003] CN102053280A discloses "NMR groundwater detection system and detection method with reference coil", but this method can only eliminate relevant power frequency harmonic noise, and the noise elimination effect is affected by the structure of the two coils, the laying position and the noise Mutations have a big impact
However, since this method is implemented in software, the problem of amplifier saturation of the acquisition device cannot be suppressed, and the data calculation is complicated, so it is difficult to quickly extract signals in the embedded system on chip
[0006] At present, the traditional denoising algorithms for detecting nuclear magnetic resonance signals are mostly for single noise denoising processing, which cannot effectively deal with the complex environmental noise in actual work.
In addition, none of the above three methods can suppress the problem of amplifier saturation of the acquisition device, and all of them are subsequent software denoising, which cannot extract signals in real time

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[0077] Use as Figure 4 The measurement device shown tests the ground magnetic resonance signal rapid extraction device and method based on phase-locked amplification technology proposed by the present invention. The programmable signal source generates an E in the signal coil through a voltage attenuator 0 =200nV, f L =2000Hz,T 2 *=150ms andθ=30° artificial magnetic resonance signal, the expression is e(t)=200exp(-t / 0.15)cos(2π×2000×t+30°), because the receiving coil is placed parallel to the signal coil, And the same number of turns, wire diameter and structure are used, so the same magnetic resonance signal is also coupled in the receiving coil, and the receiving coil is coupled with spatial electromagnetic noise. The controller activates the programmable signal source to output the signal through the synchronous trigger. Start the quick extraction device proposed by the present invention.

[0078] The reference signals output by the adjustment signal generator and the 90° ph...

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Abstract

The invention relates to the technical field of nuclear magnetic resonance groundwater detection, in particular to a ground magnetic resonance signal rapid extraction device and method based on phase-locked amplifier technology. The ground magnetic resonance signal rapid extraction device based on the phase-locked amplifier technology comprises a receiving coil, a band-pass filter with 200Hz bandwidth and adjustable central frequency, a main control module and a signal generator, wherein the receiving coil is used for sensing a magnetic resonance signal generated by underground water; the band-pass filter with 200Hz bandwidth and adjustable central frequency can adjust the central frequency into larmor frequency through the main control module and can receive the magnetic resonance signal;the main control module controls the signal generator to generate a cosine signal with the larmor frequency, and the signal is used as a reference signal and can achieve frequency movement through anin-phase channel together with an output signal of the band-pass filter with 200Hz bandwidth and adjustable central frequency; the main control module controls the signal generator to generate a cosine signal with the larmor frequency which is then converted into a sine signal through a 90 degree phase shifter, and the signal serves as a reference signal and can achieve frequency movement througha quadrature channel together with the output signal of the band-pass filter with 200Hz bandwidth and adjustable central frequency; and rapid extraction can be realized.

Description

Technical field [0001] The invention relates to the technical field of nuclear magnetic resonance groundwater detection, in particular to a ground magnetic resonance signal rapid extraction device and method based on phase-locked amplification technology. Background technique [0002] Ground magnetic resonance technology can directly detect groundwater and has the advantages of qualitative and quantitative detection. However, the ground magnetic resonance signal is extremely weak, only nanovolts, and it is susceptible to noise interference and the signal-to-noise ratio is low. Especially in areas with severe man-made noise interference, the amplifier will saturate and cannot extract effective signals. [0003] CN102053280A discloses the "nuclear magnetic resonance groundwater detection system and detection method with reference coil", but this method can only eliminate the relevant power frequency harmonic noise, and the noise reduction effect is affected by the structure, laying ...

Claims

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Application Information

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IPC IPC(8): G01V3/14
CPCG01V3/14Y02A90/30
Inventor 张洋张博皮帅陈思博孙德立李苏杭林婷婷
Owner JILIN UNIV
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