Measurement and evaluation on the extremely low frequency (ELF) shielding materials using recycle local steel mill by-product in malaysia

Nazaruddin Abd Rahman, Wan Nor Liza Mahadi, Norfizah Ali

Research output: Contribution to journalArticle


Modern electronic devices and medical equipments such as computers, magnetic resonance imaging (MRI) machines and scanning electron microscopes (SEM) may not be able to operate efficiently if the items were continuously exposed under extremely low frequency a.c magnetic field emissions. This effect usually is due to the phenomenon of electromagnetic field interference (EMI) which is caused by high voltage sources. Recent study in Malaysia has indicated that applications with passive material shielding techniques were among the best options but it may be costly. In order to reduce the cost, passive shielding materials from recycling local steel mill by-product were used. The materials performances were evaluated through induction magnetic field measurement instrumentation methods with typical EMF Helmholtz a.c single-phase coil excitation test systems. The experiment was successfully conducted with achievable 35.5% reduction rate of magnetic field emissions from material specimens for effective shielding schemes.

Original languageEnglish
Pages (from-to)7-12
Number of pages6
JournalJournal of Electrical and Electronics Engineering
Issue number1
Publication statusPublished - 29 Dec 2010


All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering

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