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Vol. 155, Issue 8, August 2013, pp. 262-270




Improving the Lorentz Force Amplitude of an EMAT Using Stacked Coil Configuration
1 Evans Ashigwuike, 1 Wamadeva Balachandran, 2 Sadiq Thomas, 1 Nadaraja Manivannan, 1 Ruth Mackay

1 Centre for Electronic System Research, Brunel University Uxbridge, Middlesex, UB83PH 2 Herriot Watt University, School of Built Engineering, Institute for Infrastructure & Environment, Edinburgh, E14 4AS, UK
Tel.: +44(0)1895265774, fax: +44(0)1895258728
E-mail: evans.ashigwuike@brunel.ac.uk, s.thomas@hw.ac.uk


Received: 16 May 2013   /Accepted: 12 August 2013   /Published: 20 August 2013

Digital Sensors and Sensor Sysstems


Abstract: This research presents a study of a novel method of improving the Lorentz force amplitude of a planer spiral coil EMAT configuration by stacking the coils. A 2D axisymmetric Finite Element Model was developed to study and compare the density of the Lorentz Force (LF) generated at the skin depth by the Stacked Spiral-EMAT (SS-EMAT) configuration on cs70 grades of pipe steel materials. The response of the novel EMAT configuration to variation of parameters such as the static magnetic field, internal diameter, excitation frequency, lift-off, coil stacking, the thickness of the insulation layer and number of cycles per tone burst were also investigated to ascertain the viability of the Stacked Spiral-EMAT. The results obtained showed that there is a significant improvement in the density of Lorentz Force generated by the novel EMAT when stacked. Hence a new EMAT configuration is proposed to enhance the performance of radially polarised bulk wave EMATs.


Keywords: Lorentz force; Electromagnetic acoustic transducer; Eddy current


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