Underground nuclear magnetic resonance exploration method based on step-by-step transmission

Abstract

The invention belongs to the field of geophysical exploration equipment and particularly relates to an underground nuclear magnetic resonance exploration method based on step-by-step transmission. An adopted exploration device comprises a transmitting coil, a transmitting upper computer, an MCU (microprogrammed control unit) lower computer, a DC-DC (direct current-direct current) boost power supply, an energy-storage capacitor, a transmitting bridge circuit, a detector and a harmonic capacitor, wherein the transmitting upper computer is connected with the MCU lower computer through a serial port bus and a communication interface, the MCU lower computer is connected with the DC-DC boost power supply, the DC-DC boost power supply is connected with the energy-storage capacitor and used for charging the energy-storage capacitor, the MCU lower computer is connected with the transmitting bridge circuit through a drive and control circuit prior to being connected with the energy-storage capacitor, the energy-storage capacitor is connected with the transmitting coil through the harmonic capacitor and detects voltage through the detector, an output end of the detector is connected with the MCU lower computer, and the detector is used for detecting current of the transmitting coil and is connected with the MCU lower computer. The underground nuclear magnetic resonance exploration method based on step-by-step transmission has the advantages that by the aid of a one-charging and multi-transmitting mode for the energy-storage capacitor, working efficiency during exploration is improved, and repetitive work time is shortened.

Description

technical field [0001] The invention belongs to the field of geophysical exploration equipment, in particular to an underground nuclear magnetic resonance detection method based on step-by-step emission. Background technique [0002] In MRS detection, the exploration depth mainly depends on two factors. One is the size of the coil on the ground, and the detection depth is approximately equal to the diameter of the coil or the side length of the box; the other is the size of the excitation pulse moment. The area is not easy to realize, and the detection depth is generally changed by increasing the excitation pulse moment. The excitation pulse moment is q=I0×τp, where I0 and τp are the amplitude and duration of the emission current pulse, respectively. The emission duration is usually constant, and increasing the excitation pulse moment mainly depends on increasing the emission current, that is, increasing the voltage of the high-power power supply. The nuclear magnetic reso...

AI Technical Summary

Problems solved by technology

Each emission current needs to be charged once, and there is no detection device for voltage and current. For actual field measurement, it takes a lot of time and energy to repeat the same work, which is not only inefficient, but also due to multiple charging. During the discharge process, the requirements for the device are relatively high, it is easy to be damaged, and the reliability needs to be improved

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