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Optimizing a rapid shutdown module for pre-polarization current in surface nuclear magnetic resonance.

Kun Zhou1, Chao Chen1, Yiming Cao1

  • 1Key Laboratory of Geo-exploration Instruments, Ministry of Education of China, Changchun 130061, China.

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|October 31, 2021
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Summary
This summary is machine-generated.

A new rapid shutdown circuit enhances pre-polarization surface nuclear magnetic resonance (PSNMR) signals in noisy environments. This optimized circuit improves free induction decay (FID) signal amplitude for better hydrological investigations.

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Area of Science:

  • Geophysics
  • Electrical Engineering

Background:

  • Surface nuclear magnetic resonance (SNMR) is crucial for hydrological studies.
  • High ambient noise can reduce the free induced decay (FID) signal amplitude.
  • Pre-polarization fields improve FID signals but require optimized shutdown due to spatial inhomogeneity.

Purpose of the Study:

  • To design and validate a rapid and adiabatic shutdown circuit for pre-polarization surface nuclear magnetic resonance (PSNMR) systems.
  • To address the challenge of inhomogeneous pre-polarization fields in SNMR.
  • To enable uniform shutdown of multiple pre-polarization coils with varying parameters.

Main Methods:

  • Designed a rapid and adiabatic shutdown circuit using a semi-controlled full bridge circuit.
  • Utilized magnetic field energy transfer from the transmitting coil to a capacitor.
  • Controlled the pre-polarization current decay by adjusting circuit parameters.
  • Verified the shutdown ramp and time through simulations and experiments.

Main Results:

  • The designed circuit enables exponential decay of pre-polarization current to zero.
  • Increasing capacitor voltage from 65 to 300 V increased current amplitude from 15 to 48 A.
  • Shutdown time decreased from 1.4 ms to 1 ms as capacitor voltage increased.
  • The scheme allows uniform shutdown for multiple transmitting coils.

Conclusions:

  • The developed shutdown circuit offers a reliable solution for PSNMR systems.
  • Optimized shutdown enhances FID signal gain in PSNMR applications.
  • This technology improves the effectiveness of SNMR in noisy hydrological investigations.