Detection method of nuclear magnetic resonance directional detection device introducing artificial magnetic field

Abstract

The invention relates to a nuclear magnetic resonance orientation detection device capable of generating an artificial magnetic field and a detection method. According to the nuclear magnetic resonance orientation detection device, a notebook computer is connected with an emitting coil through a main control unit, an output-adjustable high-power power supply, a high-power emitting bridge circuit, and a resonance capacitor. The notebook computer is connected with a receiving coil through an A / D conversion unit, an amplifier circuit, a signal processing circuit and a high-voltage diverter switch. The notebook computer is connected with an electromagnet through an electromagnet drive circuit. According to the nuclear magnetic resonance orientation detection device and the detection method, by means of the combined action of the magnetic field generated by the electromagnet and a natural geomagnetic field, the frequency of nuclear magnetic resonance detection is improved, and resistance to power frequency harmonic interference is improved; the intensity of the magnetic field generated by the electromagnet changes along with distances, a gradient magnetic field is generated, and the detection resolution ratio is improved; the direction of the electromagnet can be changed, detection in a specific direction and within a specific distance can be achieved, the precise positioning problem of a water-containing body is solved. The nuclear magnetic resonance orientation detection device and the detection method have the advantages of direct detection, unique explanation, result quantization and precise measurement.

Description

technical field [0001] The present invention relates to a geophysical exploration equipment and method for detection using the principle of nuclear magnetic resonance, especially a detection method for a nuclear magnetic resonance directional detection device that introduces an artificial magnetic field. Background technique [0002] In underground construction, especially in large-scale underground excavation projects such as tunnels and mines, due to complex geological conditions, geological disasters such as water inrush and mud gushing caused by groundwater occur from time to time, which brings huge disasters and helplessness to construction safety. Estimated economic loss. How to accurately and effectively detect the surrounding water-bearing bodies in underground engineering has become an important research direction in geophysical exploration methods. [0003] CN101603423 discloses "a direct current power generation method for detecting water-bearing structures in ad...

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Problems solved by technology

However, the nuclear magnetic resonance detection device and detection method for the advanced detection of the water body in front of the above invention only use the natural geomagnetic field. There is water-bearing body in front or behind of the ground, that is, the purpose of directional advanced detection cannot be achieved

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