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Magnetic resonance nondestructive in-situ detection device for underground organic pollutants and detection method

A technology for in-situ detection of organic pollutants, applied in the field of geophysical exploration equipment, can solve problems such as easily damaged geology and secondary pollution, and achieve the effects of improving the signal-to-noise ratio, eliminating the influence, and increasing the amplitude of the magnetic resonance signal.

Active Publication Date: 2020-06-16
JILIN UNIV
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a device and detection method for non-destructive in-situ detection of underground organic pollutants by magnetic resonance, so as to solve the problem of secondary pollution caused by traditional drilling and sampling that is easy to damage the geology

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  • Magnetic resonance nondestructive in-situ detection device for underground organic pollutants and detection method
  • Magnetic resonance nondestructive in-situ detection device for underground organic pollutants and detection method
  • Magnetic resonance nondestructive in-situ detection device for underground organic pollutants and detection method

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Embodiment Construction

[0034] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0035] Such as figure 1 As shown, the nuclear magnetic resonance of hydrogen protons includes three processes: before excitation, hydrogen protons are in a stable state, and their magnetic moment is in line with the geomagnetic field B 0 The direction is the same; during the excitation process, the magnetic moment of the hydrogen proton is pulled down along the direction perpendicular to the geomagnetic field; after the excitation, the magnetic moment of the hydrogen proton returns to the equilibrium state, and the nuclear magnetic resonance signal is generated during the return process, that is, the emission relaxation pr...

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Abstract

The invention relates to a magnetic resonance nondestructive in-situ detection device for underground organic pollutants and a detection method. The device comprises a transmitting coil TC, a three-component receiving coil device and a circuit system for controlling transmitting and receiving, wherein the three-component receiving coil device comprises a receiving coil Rx, a receiving coil Ry anda receiving coil Rz, every two of the three receiving coils are perpendicular to each other, the three coils are fixed to a cube with the side length being M, the receiving coil Rx is parallel to a geomagnetic field, an angle alpha is formed between the receiving coil Rx and the ground, and alpha is the geomagnetic inclination angle of the measured ground; the receiving coil Rz is perpendicular tothe geomagnetic field; the receiving coil Ry is perpendicular to the geomagnetic field and the ground and is used for sensing space noise; the transmitting coil TC is used for generating an excitation magnetic field. The nuclear magnetic resonance theory is used for detecting organic pollutants on the shallow surface layer (0-30 m), and compared with traditional drilling sampling and other analysis methods, the method has the advantages of being nondestructive, in-situ and efficient in detection.

Description

technical field [0001] The invention relates to the field of geophysical exploration equipment, in particular to a device and a detection method for non-destructive in-situ detection of underground organic pollutants by magnetic resonance. Background technique [0002] Detection and delineation of organic pollution areas are the premise of pollution control. The current detection of organic pollutants is mostly based on biological and chemical sampling, which needs to be taken to the laboratory for analysis, which has low efficiency and secondary pollution caused by easily damaged geology during drilling and sampling. question. Ground magnetic resonance technology is a geophysical method that uses the geomagnetic field as a stable magnetic field to detect hydrogen-containing substances (such as groundwater and hydrocarbon organic pollutants) by using hydrogen protons to generate nuclear magnetic resonance phenomena. At present, this technology has been widely used in ground...

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Application Information

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IPC IPC(8): G01V3/14G01V3/38
CPCG01V3/14G01V3/38
Inventor 张洋李苏杭高兴陈健
Owner JILIN UNIV
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