Nuclear magnetic resonance water detector transmitter based on dynamic compensation

Abstract

The invention discloses a nuclear magnetic resonance water detector transmitter based on dynamic compensation. The nuclear magnetic resonance water detector transmitter comprises a control module, a transmitter charging module, and a transmitter pulse transmitting module. The control module comprises a single-chip microcomputer module and a PC, which are connected with each other. The transmitter charging module comprises a lithium battery pack, a first relay, a boosting circuit, a constant current source, a power supply large capacitor, and a detection circuit. The transmitter pulse transmitting module comprises a second relay, a switching device control module, a Larmor frequency generator, an H bridge inverter module, a matching and tuning capacitor, and a transmission coil. The nuclear magnetic resonance water detector transmitter based on the dynamic compensation is advantageous in that during the discharging process of the capacitor, the capacitor voltage compensation is carried out, and the before the capacitor voltage decreases to a certain extent, the transmission time of the transmitter is prolonged by compensating the capacitor voltage, and the greatest pulse moment of the transmission pulses is 60000 A / ms, excitation times of polarization of an aquifer at an equal level are reduced, and the working efficiency of the transmitter is greatly improved.

Description

technical field [0001] The invention relates to the field of detection, in particular to a nuclear magnetic resonance water detector transmitter based on dynamic compensation. Background technique [0002] Fresh water is an increasingly scarce resource, and surface water cannot meet people's needs in arid regions. Therefore, the exploration and exploitation of groundwater resources has gradually attracted people's attention. The nuclear magnetic resonance method of finding water is the only method in the world that directly finds water on the surface of the earth through the principles of geophysics. By emitting electromagnetic pulses of Larmor frequency on the surface, the groundwater is polarized to produce a nuclear magnetic resonance phenomenon. By inverting the relaxation signal, the hydrological information of the subsurface in the detection area can be obtained. When exploring groundwater resources, the water layer needs to be polarized by the current pulse signal e...

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Problems solved by technology

Therefore, the resulting electromagnetic pulse emission time is very short, so that the pulse moment of the emitted current pulse is limited, and multiple excitations are often required to polarize the water layer to a certain extent. For example, the pulse moment of the NUMIS water finder in France is the largest. 9000A / ms, more than 60 excitations are required in the general measurement process

The efficiency of the transmitter is limited in the emission time of the electromagnetic pulse moment

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