A low-frequency Eddy current probe based on miniature fluxgate array for defect evaluation in steel components

Saari, M. M. and Nadzri, N. A. and Zaini, M. A. H. P. and Ramlan, N. H. and Tsukada, Keiji (2022) A low-frequency Eddy current probe based on miniature fluxgate array for defect evaluation in steel components. IEEE Transactions on Magnetics, 58 (2). pp. 1-5. ISSN 0018-9464. (Published)

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Abstract

Detecting defects in high-permeability steel components can be challenging when using the eddy current technique. This is due to the strong magnetization signal that is simultaneously generated along with the eddy current signal. To minimize the regions of the induced eddy current and its detection, an eddy current probe based on an array of miniature fluxgate sensors (DRV425; Texas Instrument, USA) and axial inductors was proposed and fabricated in the study. The fluxgate sensors were arranged in two layers, and the sensors were sandwiched between two layers of inductors. The output signals from the fluxgate array were sampled to obtain a differential signal of the eddy current intensity and direction. A phase-sensitive detection technique was implemented to isolate the strong magnetization signal from the detected eddy current signal and utilized to characterize artificial slits with varying depths. The developed probe successfully characterized both the vertically and horizontally oriented slits with depths from 2 to 10 mm on a 12 mm-thick mild steel plate. A better sensitivity was notable in the evaluation of the vertical slits where the vertical slits would increase the eddy current intensity in contrast to the horizontal slits around the slits. It was shown that the eddy current’s distribution map obtained from the developed probe could be used to reveal the physical dimension of the slit.

Item Type:	Article
Additional Information:	Indexed by Scopus
Uncontrolled Keywords:	Crack; Defect; Eddy current testing; Steel; Fluxgate
Subjects:	T Technology > TK Electrical engineering. Electronics Nuclear engineering
Faculty/Division:	Faculty of Electrical & Electronic Engineering Institute of Postgraduate Studies
Depositing User:	Dr. Mohd Mawardi Saari
Date Deposited:	04 Aug 2022 02:15
Last Modified:	04 Aug 2022 02:15
URI:	http://umpir.ump.edu.my/id/eprint/33840
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