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Electromagnetic shielding is the use of specific materials in the form of enclosures or barriers to reduce electric and magnetic field levels in a region of space. For ELF magnetic fields, a shield material must have significant electrical conductivity and/or significant permeability. These two material attributes correspond to the two basic magnetic field shielding mechanisms: induced-current shielding and flux-shunting, respectively.
Though simple in concept, shielding applications are complex. Induced currents and magnetization in the shield material depend on the overall source-shield configuration. Both the region where shielding is achieved and the amount by which the field is reduced over this region depend on:
- Source Geometry and Orientation
- Source Magnitude
- Shield Geometry
- Shield Composition
- Location of the Shield and Source
Electric Research has the instrumentation to quantify the complex magnetic field characteristics that always exist in situations where magnetic field management is required. Frequently, the sophisticated measurement program that we use leads us directly to a simple solution that does not require a shield. If shielding is found necessary, we have an array of computer modeling programs that account for all of the factors listed above. After our expert staff has completed a shield design model study, we can guarantee the shield performance. If desired by the client, we also have the capability to install the shield system.