Distributed magnetic resonance underground water detection device and method

Abstract

The invention relates to a distributed magnetic resonance underground water detection device and method. The device comprises an excitation device, a polarization device, an air receiving structure carrying an array type cold coil sensor and a detection coil to which the air receiving structure belongs. A polarization transmitter determines the positions of the polarization transmitter and the airborne receiving structure through a position analysis module and determines whether the polarization transmitter outputs the signals or not. During detection, the polarization device polarizes a watersource to enhance the amplitude of a magnetic resonance signal; after the polarization current is quickly and stably turned off, the excitation device outputs instantaneous local Larmor frequency pulses to excite hydrogen protons in water; after excitation is stopped, the hydrogen protons return to the initial energy level, and an array type cold coil sensor is used for collecting magnetic resonance signals; and finally, the signal is transmitted to a handheld terminal through a wireless module to be displayed and stored. The distributed transmitting structure and the array type cold coil areused for detecting underground water, the advantages of being high in noise immunity, capable of achieving multi-dimensional fine imaging and high in efficiency are achieved, and the underground water exploration range is expanded.

Description

Technical field [0001] The invention belongs to the research field of geophysical prospecting technology, and particularly relates to an array type cold coil magnetic resonance groundwater detection device and a detection method suitable for multi-dimensional magnetic resonance groundwater imaging. Background technique [0002] With the rapid economic development and population growth, my country is facing a serious water shortage problem. Magnetic Resonance Sounding (MRS) technology is used for groundwater detection due to its non-invasive, qualitative and quantitative advantages, and has been rapidly developed in recent years. However, the existing magnetic resonance detection methods are mostly performed under the geomagnetic field, and the signal is small, which makes it difficult to obtain an effective magnetic resonance signal; in addition, the efficiency is low when detecting multiple locations in a wide range. Therefore, it is necessary to explore and develop rapid detec...

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Problems solved by technology

[0007]A kind of water finding instrument of the above invention uses polarized electrodes and non-polarized electrodes to detect groundwater. It needs to design electrodes in the detection area, and the process is complicated. The flexibility is poor, and with the increase of the detection range, the number of electrodes increases more, which will damage the surface and affect the ecological environment; the cold coil NMR groundwater detection device uses a cold coil probe as the receiving sensor, which improves the performance of the sensor and enables it to be flexibly applied to In narrow environments such as mine tunnels, but when this method is used for large-scale detection, it is troublesome to move the cold coil probe and the efficiency is low; the magnetic resonance multi-channel detection method that uses a pre-polarization field to enhance the signal amplitude adopts a multi-channel method to achieve Multi-dimensional imaging of high-noise underground space, but this method requires a reasonable choice of coil combination and quantity, complex wiring, and it is difficult to lay reference coils in places with small detection areas, which affects the experiment; an aeromagnetic resonance groundwater detection device will launch Both the device and the receiving device are placed on the aircraft, which has a great advantage in detection efficiency, but this method detects in the geomagnetic field environment, the signal is weak, and it is difficult to obtain accurate groundwater information

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