Ground-air nuclear magnetic resonance groundwater detection system and detection method

Abstract

The invention provides a ground-and-air nuclear magnetic resonance underground water detecting system and a ground-and-air nuclear magnetic resonance underground water detecting method. The system comprises two grounding electrodes which are connected with a transmitter through transmitting lead. The transmitter is controlled through a ground master control system. The transmitter transmits excitation current with frequency of local Larmor frequency to ground through changing emission current of the grounding electrodes. A receiving coil which is loaded on an aerial vehicle acquires a nuclear magnetic resonance signal which is generated by magnetic moment precession. The ground master control system performs remote controlling on transmission and stoppage of the excitation current through a communication module. The ground master control system makes a receiver which is connected with the receiving coil acquire the nuclear magnetic resonance signal in a gap when the excitation current is stopped through the communication module. The acquired nuclear magnetic resonance signal is transmitted to an upper computer through the communication module. The ground-and-air nuclear magnetic resonance underground water detecting system and the ground-and-air nuclear magnetic resonance underground water detecting method has advantages of large ground transmitting and detecting depth, high resolution, wide air receiving and detecting range, high detecting speed and effective underground water resource detecting range.

Description

technical field [0001] The invention relates to a detection system for searching for groundwater, in particular to a ground-air nuclear magnetic resonance groundwater detection system and a detection method suitable for detection in areas with complex topography. Background technique [0002] The utilization rate of water resources and per capita water consumption in my country are lower than the world average level, and the shortage of water resources seriously affects the sustainable development of social economy. There are many methods for finding and evaluating groundwater, but all rely on detecting water-bearing structures or physical anomalies to find water indirectly, and do not have the ability to qualitatively and quantitatively analyze groundwater. The Magnetic Resonance Sounding (MRS) method is currently the only geophysical method in the world that can directly detect groundwater. It has the advantages of high resolution, high efficiency, rich information and uni...

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Problems solved by technology

[0004] The cold coil nuclear magnetic resonance groundwater detection device of the above invention uses a cold coil probe to greatly reduce the coil volume of the nuclear magnetic resonance water finding instrument, and can be flexibly used in narrow working environments such as mines and tunnels, and can be used for large-scale monitoring in complex surface environments. The detection is helpless; the nuclear magnetic resonance differential detection tunnel water inrush advance prediction device integrates the transmitting part and the receiving part, the detection process is complicated, the flexibility is poor, the detection range is limited, and it is difficult to realize extensive exploration of groundwater bodies; the multi-channel nuclear magnetic resonance detector When realizing the two-dimensional detection of groundwater bodies, it is necessary to lay multiple coils and choose a reasonable combination of coils, so the wiring is complicated and the detection efficiency is low. Moreover, it is not suitable for special areas such as mountains and jungles where personnel and instruments are difficult to enter. The way of laying coils on the ground to receive nuclear magnetic resonance signals

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