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Magnetic resonance multi-channel detection method and apparatus using pre-polarization field to enhance amplitude of signal

A technology to enhance signal and magnetic resonance, applied in electron magnetic resonance/nuclear magnetic resonance detection, etc., can solve problems such as inability to detect non-layered complex water bodies, achieve detection sensitivity and signal change transition stability, improve anti-interference ability, predict The effect of uniform polarization field

Inactive Publication Date: 2018-04-20
JILIN UNIV
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Problems solved by technology

In a strong noise environment, such as towns with strong man-made noise and power interference, and large-scale excavation projects such as tunnels and mines, it is impossible to detect non-layered complex water bodies

Method used

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  • Magnetic resonance multi-channel detection method and apparatus using pre-polarization field to enhance amplitude of signal
  • Magnetic resonance multi-channel detection method and apparatus using pre-polarization field to enhance amplitude of signal
  • Magnetic resonance multi-channel detection method and apparatus using pre-polarization field to enhance amplitude of signal

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Embodiment 1

[0060] A magnetic resonance multi-channel detection method that uses a pre-polarized field to enhance the signal amplitude. It is mainly composed of four functional modules: the upper computer 1, the transmitter 2, the receiver 3, and the detection coil. When detecting, the computer 4 passes through the main control unit 5 Control the transmission switching control circuit 8, choose to connect to the adjustable DC pulse transmitter circuit 6 and connect to the DC / AC transmitter coil 9, the first DC transmitter coil 10, the second DC transmitter coil 11, the third DC transmitter coil 12 and the fourth The direct current of the direct current transmitting coil 13 passes through multiple direct current transmitting coils to generate a uniform pre-polarized magnetic field far higher than the nT level of the geomagnetic field. Under the action of strong magnetization, it increases the macroscopic magnetic moment of hydrogen protons in groundwater, and then turns off the direct current...

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Abstract

The invention relates to a magnetic resonance multi-channel detection method and apparatus using a pre-polarization field to enhance the amplitude of a signal. The method comprises: a plurality of direct-current transmitting coils and a direct-current / alternating-current transmitting coil are set, direct currents are emitted to form a pre-polarization field, and the magnetization intensity of hydrogen protons in water is enhanced; after emission for a period of time, the direct currents are cut off, the direct-current / alternating-current transmitting coil emits an alternating current with aLarmor frequency to excite the hydrogen protons to generate a magnetic resonance phenomenon; after the alternating current is cut off, the hydrogen protons release freely-sensing attenuation magneticresonance signals, and a plurality of receiving coils and one reference coil are set to measure magnetic resonance signals and noise signals; and the alternating current amplitude is controlled to complete measurement of different pulse torques. Therefore, the signal amplitude is enhanced; the detection signal-to-noise ratio is increased; and detection on a non-layered complex water-containing structure is carried out to realize multi-dimensional magnetic resonance measurement of a uniform pre-polarization field in a high-noise environment like an environment with manual noises or serious power interference or a large tunneling area like a tunnel or mine.

Description

Technical field [0001] The invention relates to a magnetic resonance multi-channel detection method and device that uses a pre-polarized field to enhance signal amplitude. It can use magnetic resonance (Magnetic Resonance Sounding, MRS) technology to perform layering under severe noise interference and special environments such as tunnels and mines. And the detection of non-layered complex groundwater structures. Background technique [0002] Magnetic resonance detection technology, as the only geophysical method that can directly detect groundwater, is widely used in shallow groundwater detection. The traditional magnetic resonance technology relies on the natural geomagnetic field of only nT level, the signal amplitude is limited, and it is easily submerged by noise, which severely restricts the development of magnetic resonance technology. [0003] CN105549098A discloses an underground full-space nuclear magnetic resonance prepolarization detection device and detection method. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V3/14
Inventor 林婷婷杨玉晶徐洋陈健万玲腾飞
Owner JILIN UNIV
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