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Analysis of ringing effects due to magnetic core materials in pulsed nuclear magnetic resonance circuits
Journal of Applied Physics
  • Neelam G. Prabhu Gaunkar, Iowa State University
  • N. R. Y. Bouda, Iowa State University
  • Ikenna C. Nlebedim, Iowa State University
  • Ravi L. Hadimani, Iowa State University
  • I. Bulu, Schlumberger-Doll Research
  • K. Ganesan, Schlumberger-Doll Research
  • Y. Q. Song, Schlumberger-Doll Research
  • Mani Mina, Iowa State University
  • David C. Jiles, Iowa State University
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This work presents investigations and detailed analysis of ringing in a non-resonant pulsednuclear magnetic resonance (NMR) circuit. Ringing is a commonly observed phenomenon in high power switching circuits. The oscillations described as ringing impede measurements in pulsed NMR systems. It is therefore desirable that those oscillations decay fast. It is often assumed that one of the causes behind ringing is the role of the magnetic core used in theantenna (acting as an inductive load). We will demonstrate that an LRC subcircuit is also set-up due to the inductive load and needs to be considered due to its parasitic effects. It is observed that the parasitics associated with the inductive load become important at certain frequencies. The output response can be related to the response of an under-damped circuit and to the magnetic core material. This research work demonstrates and discusses ways of controlling ringing by considering interrelationships between different contributing factors.

The following article appeared in J. Appl. Phys. 117, 17E508 (2015) and may be found at

Copyright 2015 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.
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American Institute of Physics
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Neelam G. Prabhu Gaunkar, N. R. Y. Bouda, Ikenna C. Nlebedim, Ravi L. Hadimani, et al.. "Analysis of ringing effects due to magnetic core materials in pulsed nuclear magnetic resonance circuits" Journal of Applied Physics Vol. 117 Iss. 17 (2015) p. 17E508
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