Short dead zone magnetic resonance emission device and control method based on wide configuration harmony

Abstract

The invention relates to the field of geophysical exploration equipment, and specifically, relates to a short dead zone magnetic resonance emission device and a control method based on wide configuration harmony. A PC upper computer and a master control module are provided, according to a command of the upper computer, a DC-DC converter is controlled to charge an energy-storage capacitor, and thecharging energy comes from a storage battery; by sending a PWM wave, a H bridge emission module and a coil are controlled to perform bipolar pulse emission, and emission energy comes from the energy-storage capacitor; by controlling a first switch driving module, on and off of a first switch are controlled, by controlling a second switch driving module, on and off of a second switch are controlled, and by control a third switch driving module, clamp voltage of a clamping module is controlled; based on a negation circuit used for negation of a switch control signal of a master control module, complementation is executed for first switch and second switch switch-on signals. The device and the method provided by the invention solve a problem that the signal itself has relatively low amplitude, is almost completely submerged in noise after energy release time decay, brings great difficulty in follow-up data processing and inversion and has strong impact on detection effect, can effectivelyreduce turn-off time of an emission system and reduce dead zone time of magnetic resonance detection, and consequently can improve signal amplitude.

Description

technical field [0001] The invention relates to the field of geophysical exploration equipment, in particular to a wide-matching-based short-dead zone magnetic resonance transmitting device and a control method. Background technique [0002] Ground magnetic resonance technology (Magnetic Resonance Sounding, MRS) is currently the only geophysical method for non-invasive groundwater detection, and is widely used in groundwater detection. When the magnetic resonance water detection system detects groundwater, the transmitter first transmits a bipolar pulse for a certain period of time through the load coil to excite the hydrogen protons in the groundwater, and then removes the excitation pulse, and the receiver receives the induced free induction through the same coil. Attenuation (Free Induction Decay, FID) signal, so as to invert the hydrogeological situation. [0003] The effective signal of MRS is nV level, so the receiving system meets the characteristics of weak signal a...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a short dead zone magnetic resonance emission device and control method based on wide matching, to solve the problem that the amplitude of the signal itself is low, and it is almost completely submerged in the noise after energy release time attenuation. Processing and inversion bring great difficulties and seriously affect the detection effect

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