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Title: Analysis of ringing effects due to magnetic core materials in pulsed nuclear magnetic resonance circuits

Abstract

This work presents investigations and detailed analysis of ringing in a non-resonant pulsed nuclear 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 the antenna (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.

Authors:
; ; ; ; ;  [1]; ; ;  [2]
  1. Department of Electrical and Computer Engineering, Iowa State University, Ames, Iowa 50011 (United States)
  2. Schlumberger-Doll Research, Cambridge, Massachusetts 02139 (United States)
Publication Date:
OSTI Identifier:
22410157
Resource Type:
Journal Article
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 117; Journal Issue: 17; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0021-8979
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ANTENNAS; MAGNETIC CORES; MAGNETIC MATERIALS; MAGNETISM; NMR SPECTRA; NUCLEAR MAGNETIC RESONANCE; OSCILLATIONS; SWITCHING CIRCUITS

Citation Formats

Prabhu Gaunkar, N., E-mail: neelampg@iastate.edu, Bouda, N. R. Y., Nlebedim, I. C., Hadimani, R. L., Mina, M., Jiles, D. C., Bulu, I., Ganesan, K., and Song, Y. Q. Analysis of ringing effects due to magnetic core materials in pulsed nuclear magnetic resonance circuits. United States: N. p., 2015. Web. doi:10.1063/1.4916753.
Prabhu Gaunkar, N., E-mail: neelampg@iastate.edu, Bouda, N. R. Y., Nlebedim, I. C., Hadimani, R. L., Mina, M., Jiles, D. C., Bulu, I., Ganesan, K., & Song, Y. Q. Analysis of ringing effects due to magnetic core materials in pulsed nuclear magnetic resonance circuits. United States. doi:10.1063/1.4916753.
Prabhu Gaunkar, N., E-mail: neelampg@iastate.edu, Bouda, N. R. Y., Nlebedim, I. C., Hadimani, R. L., Mina, M., Jiles, D. C., Bulu, I., Ganesan, K., and Song, Y. Q. Thu . "Analysis of ringing effects due to magnetic core materials in pulsed nuclear magnetic resonance circuits". United States. doi:10.1063/1.4916753.
@article{osti_22410157,
title = {Analysis of ringing effects due to magnetic core materials in pulsed nuclear magnetic resonance circuits},
author = {Prabhu Gaunkar, N., E-mail: neelampg@iastate.edu and Bouda, N. R. Y. and Nlebedim, I. C. and Hadimani, R. L. and Mina, M. and Jiles, D. C. and Bulu, I. and Ganesan, K. and Song, Y. Q.},
abstractNote = {This work presents investigations and detailed analysis of ringing in a non-resonant pulsed nuclear 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 the antenna (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.},
doi = {10.1063/1.4916753},
journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 17,
volume = 117,
place = {United States},
year = {2015},
month = {5}
}