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Choice of parameters for passive shielding of power-frequency magnetic fields

Author

Listed:
  • Ener Salinas

    (London South Bank University)

  • Marina Rezinkina

    (The Ukrainian National Academy of Sciences)

Abstract

Epidemiological studies suggesting the possibility of harmful effects on human (specifically children’s leukaemia) due to long-term exposure to magnetic fields of extremely low frequency (e.g. 50/60 Hz) and relatively low values (i.e. over the microtesla range) have stirred high activity in the topic of magnetic field mitigation. To reduce these fields, it is common to use passive metal screens (e.g. plates made of aluminium or steel). To design them, effective and fast numerical computations are highly desirable. In this article, a method is presented, which computes various parameters of screens in a given shielding problem and yields magnetic field distribution and shielding factors. The method takes into consideration the 3D field distribution and is able to solve systems with large aspect ratios (thin thickness in comparison with its other dimensions); this is a common problem where other methods such as finite elements often experience difficulties. The presented method computes separately the field inside and outside the screens. Afterwards, the solutions are “stitched” together along the border of the subregions. Two practical examples are given of the developed numerical method.

Suggested Citation

  • Ener Salinas & Marina Rezinkina, 2009. "Choice of parameters for passive shielding of power-frequency magnetic fields," Environment Systems and Decisions, Springer, vol. 29(2), pages 135-140, June.
    • Handle: RePEc:spr:envsyd:v:29:y:2009:i:2:d:10.1007_s10669-008-9208-y
    DOI: 10.1007/s10669-008-9208-y
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