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

Thumbnail Image
Date
2015-01-01
Authors
Nlebedim, Ikenna
Bulu, I.
Ganesan, K.
Song, Y. Q.
Mina, Mani
Jiles, David
Major Professor
Advisor
Committee Member
Journal Title
Journal ISSN
Volume Title
Publisher
Authors
Person
Hadimani, Ravi
Affiliate Assistant Professor
Person
Mina, Mani
Teaching Professor
Person
Jiles, David
Distinguished Professor Emeritus
Research Projects
Organizational Units
Journal Issue
Is Version Of
Versions
Series
Department
Electrical and Computer Engineering
Abstract

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.

Comments

The following article appeared in J. Appl. Phys. 117, 17E508 (2015) and may be found at http://dx.doi.org/10.1063/1.4916753.

Description
Keywords
Citation
DOI
Copyright
Thu Jan 01 00:00:00 UTC 2015
Collections