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

A transmitting device and magnetic resonance technology, which is applied in electron magnetic resonance/nuclear magnetic resonance detection, etc., can solve the problems of difficult data processing and inversion, affecting the detection effect, and low signal amplitude, so as to improve the detection effect and reduce the death rate. zone time, and improve the effect of signal amplitude

Active Publication Date: 2020-02-14
JILIN UNIV
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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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  • Short dead zone magnetic resonance emission device and control method based on wide configuration harmony
  • Short dead zone magnetic resonance emission device and control method based on wide configuration harmony
  • Short dead zone magnetic resonance emission device and control method based on wide configuration harmony

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Embodiment

[0074] Now according to the actual detection, it is determined that the equivalent parameters of the coil are L=0.8mH, R=1Ω, and 10 diodes with a clamping voltage of 100V are selected in series, and the maximum clamping voltage is 1000V. If the current drops to 0.2%, it is turned off. The target The dead time is 1ms, and the specific implementation steps of the actual detection are as follows:

[0075] a. Parameter setting: PC upper computer 1 transmits emission parameters and control signals to the main control module 2, including: excitation current I=50A, excitation voltage U=290V, excitation frequency f=2330Hz, preset excitation time t=40ms, excitation Pulse duty ratio d=45%, superposition times k=8;

[0076] b. Clamping voltage adjustment: the main control module determines the clamping voltage value according to the excitation current, excitation voltage and target dead time, and determines the number of clamping diodes connected to the loop according to the clamping vol...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V3/14
CPCG01V3/14
Inventor 林婷婷李苏杭张洋万玲滕飞
Owner JILIN UNIV
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