Detection of magnetic fields highly attenuated by the skin effect through a ferrous steel boundary using a super narrow-band digital filter

Gaydecki, P., Miller, G., Zaid, M., Fernandes, B. and Hussin, H. (2008) Detection of magnetic fields highly attenuated by the skin effect through a ferrous steel boundary using a super narrow-band digital filter. IEEE Transactions on Instrumentation and Measurement. 57(6), pp. 1171-1176. 0018-9456.

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Item Type:	Article
Abstract:	A complete instrumentation system is described that is capable of launching alternating magnetic fields through a large mild steel plate that is 2 mm in thickness and detecting them on the face opposite from the transmitter with remarkable signal-to-noise ratios. Results for signal frequencies ranging between 4.5 and 13 kHz are reported. The skin depth at 9 kHz for the steel used is approximately 137 mum. The detection of the minute fields arriving at the receiving coil is made possible by the use of digitally synthesized input signals, low-noise amplification, and, in particular, the use of a powerful real-time digital signal processing system that isolates the signal of interest using a super narrow-band filter and very high levels of distortion-free gain. Although traditional methods of weak signal detection, such as lock-in amplification, may also be applied in this context, the digital approach discussed here is both more cost effective and flexible, allowing the simultaneous detection of multiple frequencies
Subjects:	T Technology > TK Electrical engineering. Electronics. Nuclear engineering > TK7800 Electronics
Creators:	Gaydecki, Patrick, Miller, Graham, Zaid, Muhammad, Fernandes, Bosco and Hussin, Haitham
Publisher:	Institute of Electrical and Electronics Engineers
Faculties, Divisions and Institutes:	University Faculties, Divisions and Research Centres - OLD > School of Applied Sciences (to 2009) > Engineering (to 2009) Faculties > Faculty of Arts, Science & Technology > Engineering
Date:	June 2008
Date Type:	Publication
Page Range:	pp. 1171-1176
Journal or Publication Title:	IEEE Transactions on Instrumentation and Measurement
Volume:	57
Number:	6
Language:	English
DOI:	https://doi.org/10.1109/TIM.2007.915150
ISSN:	0018-9456
Status:	Published / Disseminated
Refereed:	Yes
URI:	http://nectar.northampton.ac.uk/id/eprint/1707

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