28 June 2015 to 3 July 2015
Africa/Johannesburg timezone
SAIP2015 Proceeding published on 17 July 2016

Time of crossing (TOC) in Pulsed Eddy Current Signals

3 Jul 2015, 12:30
20m
Oral Presentation Track F - Applied Physics Applied

Speaker

Dr Betty Kibirige (University of Zululand)

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Yes

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Abstract content <br> &nbsp; (Max 300 words)<br><a href="http://events.saip.org.za/getFile.py/access?resId=0&materialId=0&confId=34" target="_blank">Formatting &<br>Special chars</a>

Signals picked up from pulsed eddy current systems used to evaluate aluminium specimen exhibit interesting trends. The locus received in the presence of a specimen always reaches steady state conditions at a later time than that received in the absence of a specimen. This study investigated the trends observed in the pulsed eddy current signals picked up in the absence of a specimen in relation to those picked up in the presence of aluminium specimens of different thickness. The study was carried out at specimen temperature of 30 °C with specimen thicknesses varied from 0.5 mm to 3 mm in steps of 0.5 mm. A time of crossing (TOC) between the locus of the signal received in the presence of each specimen and that received in the absence of a specimen was observed for the different thicknesses. The relationship between the TOC and the specimen thickness was a nonlinear forth-order polynomial. Linearizing this relationship for small changes about a nominal thickness could be used to gauge differences in thickness of up to 4 µm at a nominal thickness of 2 mm in thin aluminium sheets.

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Yes

Primary author

Dr Betty Kibirige (University of Zululand)

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