Nuclear magnetic resonance water detection launch device and working method based on array inverter charging

Abstract

The invention relates to a nuclear magnetic resonance water detection emitter based on array inversion charging and a work method thereof; the nuclear magnetic resonance water detection emitter comprises the following units: a PC machine with built-in host machine software used for setting parameters; a MCU main control unit communicating with the PC machine and used for controlling an array inversion power supply; a FPGA logic control unit used for receiving a start order of the MCU main control unit, forming a Larmor frequency sequence, driving an emission bridge circuit through a drive module, enabling the emission bridge circuit to work, and converting a high voltage DC electric signal into a high voltage alternate electric signal with the local Larmor frequency; an energy release unit controlled by the MCU main control unit and connected with an excitation coil energy storage capacitor pack, and used for releasing residual electric quantity according to the energy storage capacitor pack residual electric quantity after the emission is finished. The device and method can keep emitting excitation voltage in each time, and can keep the initial set voltage after multi-stacking, thus reducing volume, and improving the energy storage capacitor pack charging efficiency.

Description

technical field [0001] The invention belongs to the field of geophysical exploration equipment, in particular to a nuclear magnetic resonance water detection launch device and working method based on array inverter charging. Background technique [0002] In the process of ground nuclear magnetic resonance to find water, the emission device is one of the core equipment for exciting the magnetic resonance field, which has the characteristics of high power, precise and fast emission pulses. The pulse moment is used to change the detection depth, and the excitation pulse moment is q=I 0 *τ p , while I 0 and τ p They are the emission current pulse amplitude and emission duration, and the emission time is usually constant, while increasing the excitation pulse moment mainly depends on increasing the emission current, that is, increasing the voltage of the high-power power supply. Therefore, in order to obtain deeper hydrological information, the transmitter needs to provide a ...

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Problems solved by technology

[0005] The nuclear magnetic resonance water finding launch device of the above-mentioned invention has high measurement accuracy and good measurement effect for special needs and application occasions, but there are some deficiencies: in the nuclear magnetic resonance groundwater detection system and detection method with reference excitation coil Because it uses the traditional single DC-DC power supply and single capacitor charging, the charging efficiency is low and time-consuming, which seriously restricts the working efficiency of NMR water detection.

However, the underground nuclear magnetic resonance detection method based on step-by-step emission uses one charge to reach the set emission voltage value, but the power loss is very serious after multiple launches. After multiple launches are superimposed, it cannot provide a sufficiently large launch voltage , and also faces the problem of slow charging, therefore, it is impossible to quickly obtain NMR signals that are beneficial to inversion

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