Series resonance mode nuclear magnetic resonance detection device and detection method

Abstract

The invention relates to a series resonance mode nuclear magnetic resonance detection device and detection method. According to the series resonance mode nuclear magnetic resonance detection device, a three-component magnetic field measuring circuit is connected with a computer; a high power supply with adjustable output voltage, an emission control unit and a signal collection unit are connected; the high power supply with the adjustable output voltage is connected with a high power emission bridge circuit; the emission control unit is connected with a high-voltage relay; one end of the high-voltage relay is connected with a first receiving unit, and the other end of the high-voltage relay is connected with a Nth receiving unit. By the adoption of the series resonance mode, the size and the weight of a receiving device are greatly reduced, the transverse resolution of nuclear magnetic resonance detection is improved, a small-size receiving probe has better adaptability, and by the adoption of the series resonance mode receiving units, consumed manpower, material resources and time when a large coil is paved on spot are avoided, and working efficiency is improved. A plurality of resonance receiving units which are connected in series in each series resonance mode receiving unit work at the same time, and the amplitude of a received nuclear magnetic resonance signal is improved.

Description

technical field [0001] The invention relates to a geophysical exploration equipment and method, in particular to a nuclear magnetic resonance detection device and a detection method for early warning of geological disasters by using the principle of nuclear magnetic resonance to find water. Background technique [0002] The nuclear magnetic resonance detection method is currently the only direct groundwater detection method, which has the outstanding advantages of unique interpretation, quantitative results, and accurate measurement. In underground construction, especially in tunnel and mine underground excavation projects, due to complex geological conditions, water inrush and mud inrush geological disasters caused by groundwater occur from time to time, which brings huge disasters and inestimable economic losses to construction safety. . How to accurately and effectively detect the surrounding water-bearing bodies in underground engineering has become an important researc...

AI Technical Summary

Problems solved by technology

[0005] The nuclear magnetic resonance water finding devices of the above-mentioned inventions all have high measurement accuracy and high reliability, but there are some shortcomings. When measuring a point, it can only be obtained whether there is water in a large range (for example, a large coil of 100m*100m area of ​​10,000 square meters), resulting in low lateral resolution of the measurement, and it is difficult to accurately locate the water body; and due to the large size of the coil, it is extremely inconvenient to lay on site, which consumes manpower, material resources and time, and the work efficiency is low. Adaptability to the working environment Difference

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