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Optimization of the Coil Head of Metal Detectors Using a Magnetic Vector Potential Approach  

Oh, Jun-Seok (PINETELECOM)
Eun, Chang-Soo (Chungnam National University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea SC / v.46, no.5, 2009 , pp. 38-43 More about this Journal
Abstract
We derive an equation that predicts the induced voltage across the receiving terminals of the three-coil head of a metal detector using a magnetic vector potential approach. We also derive an equation that relates the change of the impedance of the transmitting coil to the properties of the metal. We utilize the results to obtain the optimum spacing between the driving and the receiving coils at which the maximum induced voltage is attained. Further, we determine the position of the metallic object where the voltage reaches its peak. We verify our work by comparing the results with those of a previous work.
Keywords
metal detector; head coils; three-coil head; eddy current; optimum spacing; impedance change;
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  • Reference
1 W. R. Smythe, 'Static and Dynamic Electricity', 3rd ed., New York, McGraw-Hill, pp. 280-290, 1968
2 S. Yamazaki, T. Negishi, H. Nakane, and A. Tanaka, 'Simultaneous measurement of electrical and magnetic properties of a spherical sample,' IEEE Trans. Instrum. Meas., vol. 45, no. 2, pp. 563-567, 1995
3 M. Brighton and M. J. English, 'Calculation of optimum spacing for a three coil axially symmetric metal detector,' Electronics Letters, vol. 29, no. 10, pp. 838-839, 1993   DOI   ScienceOn