Degree Type

Thesis

Date of Award

1996

Degree Name

Master of Science

Department

Electrical and Computer Engineering

First Advisor

Lalita Udpa

Abstract

The Magnetic particle inspection (MPI) method is widely used in the industry for detecting surface or near surface flaws in ferromagnetic specimens. However, the attempts to quantify the physics underlying the method have been limited. This thesis is an effort to model the behavior of the magnetic particles under the influence of magnetic leakage fields. Imaging techniques are used to recreate the dynamics of the particles prior to their reaching an equilibrium around the flaw. The proposed approach has the capability to predict the time to equilibrium of the magnetic particles. Furthermore, the efficiency of the MPI method in terms of the fraction of the total number of particles around the flaw and the signal to noise ratio of the MPI image is predicted. The overall model can be used to obtain forward transfer functions between the flaw depth; and the time to equilibrium, efficiency and signal to noise ratio of the MPI image. Optimal experimental conditions for flaws of different depths are predicted.

DOI

https://doi.org/10.31274/rtd-180813-5852

Publisher

Digital Repository @ Iowa State University, http://lib.dr.iastate.edu

Copyright Owner

Atul Subhash Athavale

Language

en

Date Available

June 10, 2013

File Format

application/pdf

File Size

76 pages

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