publication . Thesis . 1989

Assessment of defects in ferromagnetic metals with eddy currents

Oaten, Susan Rosemary;
Open Access English
  • Published: 01 Jan 1989
  • Publisher: Brunel University Institute for the Environment PhD Theses
  • Country: United Kingdom
Abstract
This thesis was submitted for the degree of Doctor of Philosophy and awarded by Brunel University. A study was made to identify and size surface breaking defects in ferromagnetic materials with eddy currents, whilst eliminating unwanted signals due to changes in magnetic permeability and probe lift-off. The former was overcome by the use of high frequencies and the latter by utilising the lift-off to characterise the defects. The lift- off or "touch" method was shown to be advantageous in that one could test steel objects having irregular surfaces, such as occurring with the presence of welds. In addition a theoretical investigation was undertaken to relate chan...
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