Array SQUID nuclear magnetic resonance groundwater detection device and imaging method

Abstract

The invention relates to an array SQUID nuclear magnetic resonance groundwater detection device and an imaging method. According to the device, a computer is connected with a pre-polarization coil through a control unit, a high power supply and a high-power transmitting bridge circuit, the control unit is connected with a receiver and the high-power transmitting bridge circuit, and the receiver is connected with a 20th SQUID through first to 19th SQUIDs. By polarizing detected water using the pre-polarization coil, the macro magnetization intensity of water is increased. Through an array SQUID receiving mode, extremely weak geo-electrical signals can be detected, greater initial amplitude of a nuclear magnetic resonance signal can be obtained, and an underground nuclear magnetic resonance detection image can be obtained in a strong-noise environment. The problem that a receiver coil is inconvenient to carry and is inconvenient in signal reception in the field is solved, and a reasonable way of receiver layout can be selected according to the topography of a region needing detection. The efficiency of groundwater searching is increased, and the cost of drilling exploration is reduced. The device and the method are conducive to detection of groundwater in a detection area in a complex-topography and strong-noise environment.

Description

Technical field: [0001] The invention relates to a detection device and an imaging method for geophysical exploration in the field of water conservancy and hydropower engineering, in particular to an array type SQUID nuclear magnetic resonance groundwater detection device and an imaging method. Background technique: [0002] Magnetic Resonance Sounding (MRS method for short) is a direct non-destructive geophysical exploration method, which can directly obtain the location and water content of underground water-rich bodies. Compared with other geophysical methods, the nuclear magnetic resonance detection method is more accurate, and at the same time avoids the expensive drilling costs, and has become an important research direction in geophysical detection methods. [0003] Magnetic resonance imaging (MRI, Magnetic Resonance Imaging) is a relatively mature imaging application at present, and is widely used in physical, chemical, biological and medical clinical detection. [...

AI Technical Summary

Problems solved by technology

But there are still some shortcomings: For example, in a strong noise environment, the MRI signal is very small compared with the strong background noise, that is, the signal-to-noise ratio is very low, and the adaptability to the working environment is poor.

[0006] The nuclear magnetic resonance water finding device of the above invention has high measurement accuracy and good measurement effect for special needs and application occasions, but there are some shortcomings: for example, in a strong noise environment, there is a difference between the nuclear magnetic resonance signal and the strong background noise. Ratio is very small, that is, the problem of low signal-to-noise ratio, poor adaptability to the working environment

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