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.
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[0034] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.
[0035] Such as figure 1 As shown, the occurrence of hydrogen proton nuclear magnetic resonance includes three processes: before excitation, the hydrogen proton is in a stable state, and its magnetic moment is related to the geomagnetic field B 0 The direction is the same; during the excitation process, the magnetic moment of the hydrogen protons collapses along the direction perpendicular to the geomagnetic field; after the excitation is over, the magnetic moment of the hydrogen protons returns to the equilibrium state, and the nuclear magnetic resonance signal is generated during the return process, that is, the emission...
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