Unconventionally high and low frequency eddy current methods for material surface characterizations

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2009-07-01
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Nakagawa, Norio
Lo, Chester
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Center for Nondestructive Evaluation

The Center for Nondestructive Evaluation at Iowa State has been involved in the use of nondestructive evaluation testing (NDT) technologies to: assess the integrity of a substance, material or structure; assess the criticality of any flaws, and to predict the object’s remaining serviceability. NDT technologies used include ultrasonics and acoustic emissions, electromagnetic technologies, computer tomography, thermal imaging, and others.

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In October of 1985 the CNDE was approved by the State Board of Regents after it had received a grant from the National Science Foundation (NSF) as an Industry/University Cooperative Research Center.

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This paper reports on a type of multiple frequency eddy current NDE methodologies. A specific focus was placed on a multiple low frequency methodology that is suitable for case depth characterization of case‐hardened steel samples. A nominally uniform excitation field approach has been developed, and demonstrated to work for discriminating the case depths ranging between 1 mm and 6 mm, while meeting additional requirements of one‐sided access and a finite stand‐off distance.

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Copyright 2010 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.

This article appeared in AIP Conference Proceedings 1211 (2010): 1471–1478 and may be found at http://dx.doi.org/10.1063/1.3362242.

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Fri Jan 01 00:00:00 UTC 2010