Adaptive filtering magnetic resonance signal anti-saturation denoising device and denoising method

An adaptive filtering, magnetic resonance signal technology, applied in the direction of electronic magnetic resonance/nuclear magnetic resonance detection, measurement device, sound wave re-radiation, etc. problem, to avoid induction and suppress power frequency harmonic interference

Active Publication Date: 2018-09-28
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It uses a digital signal processing chip to do an adaptive algorithm, which is slow and difficult to implement in real time; the least mean square (LMS) algorithm and normalized least mean square (NLMS) algorithm adopted have slow convergence speed and large steady-state error ; and the least squares algorithm (RLS) has too much calculation, and it is difficult to realize it in real time
In addition, this patent cannot solve the problem of signal saturation in a strong electromagnetic interference environment

Method used

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  • Adaptive filtering magnetic resonance signal anti-saturation denoising device and denoising method
  • Adaptive filtering magnetic resonance signal anti-saturation denoising device and denoising method
  • Adaptive filtering magnetic resonance signal anti-saturation denoising device and denoising method

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Experimental program
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Effect test

Embodiment 1

[0063] An anti-saturation adaptive real-time reference denoising experiment was conducted in Shaoguo Town, Changchun City. The specific implementation steps are as follows:

[0064] a. Lay a square coil of 100m x 100m as the transmitting coil. Based on the center of the transmitting coil, lay a 25mx25m detection coil 0, and lay 20 turns of 50cm x50cm reference coils 1, 2, 3 at three reference points about 30m away from the reference point .

[0065] b. Power on the whole system, and initialize each module through the PC (the multiples of the program-controlled amplifiers 15, 19, 23, and 27 are set to a maximum of 16 times).

[0066] c. when gathering starts, PC11 sends the related control order of gathering, sends in the FPGA module 9 through data transmission module 10, produces synchronous signal by AD control module 28, drives relay control circuit 12,16,20,24 and high-precision The AD acquisition module 8 starts to work synchronously.

[0067] d. After the relay is open...

Embodiment 2

[0074]An anti-saturation adaptive real-time reference denoising experiment was conducted on the central campus of Jilin University. The specific implementation steps are as follows:

[0075] a. Lay a square coil of 100m x 100m as the transmitting coil. Based on the center of the transmitting coil, lay a 25mx25m detection coil 0, and lay 20 turns of 1m x 1m reference coils 1, 2, 3 at three reference points about 35m away from the reference .

[0076] b. Power on the whole system, and initialize each module through the PC (the multiples of the program-controlled amplifiers 15, 19, 23, and 27 are set to a maximum of 16 times).

[0077] c. when gathering starts, PC11 sends the related control order of gathering, sends in the FPGA module 9 through data transmission module 10, produces synchronous signal by AD control module 28, drives relay control circuit 12,16,20,24 and high-precision The AD acquisition module 8 starts to work synchronously.

[0078] d. After the relay is open...

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Abstract

The invention relates to an adaptive filtering magnetic resonance signal anti-saturation de-noising device and a de-noising method. Three multi-turn small coils are used as reference channels, front-end processing modules are connected to an FPGA module through a high-precision AD collection module and then connected to a PC module through a data transmission module, and induction of nuclear magnetic signals is avoided. Through an anti-saturation module in the FPGA, signals are amplified as much as possible and are unsaturated. Real-time reference de-noising of signals is carried out using an adaptive de-noising algorithm, the parameters of an adaptive filter are modified in real time using the PC module, and the device and the method can adapt to various complicated detection environments. According to the de-noising device and the de-noising method of the invention, through experiment in a strong electromagnetic interference environment, that nuclear magnetic signals are not distorted is ensured, the signal-to-noise ratio (SNR) is improved, power-frequency harmonic interference is suppressed, an anti-saturation effect is achieved, and nuclear magnetic signals can be detected in real time on a low-SNR and easily-saturated detection site so as to lay a solid foundation for follow-up data inversion of nuclear magnetic signals.

Description

technical field [0001] The invention relates to a data acquisition device and a digital signal processing method, and is especially suitable for collecting nuclear magnetic resonance (Nuclear Magnetic Resonance, NMR) water detection signals and performing anti-saturation processing and self-adaptive real-time reference denoising. Background technique [0002] When using the principle of nuclear magnetic resonance to find water, since the nuclear magnetic signal received by the detection coil is very weak (nanovolt level), it is easily affected by spike noise, power frequency harmonics and random noise. Especially in strong electromagnetic interference environments such as mine tunnels and urban centers, nuclear magnetic signals are basically submerged and saturated by power frequency harmonics. Conventional filtering methods not only cannot effectively extract nuclear magnetic signals, but may also saturate and distort the signals. [0003] CN201010537465.2 discloses a nucle...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V3/38G01V3/14
CPCG01V3/14G01V3/38
Inventor 林君舒旭张扬张洋林婷婷赵静
Owner JILIN UNIV
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