Abstract: A device for shielding electromagnetic fields is provided. The device embodies a helmet having layers of a nickel-iron ferromagnetic alloy, a copper mesh, and an air gap; at least one channel extending radially from the helmet; at least one plug configured to removably fit into respective channels wherein each plug is operative shielding electromagnetic fields by way of the channel; and at least one sensor incorporated into the helmet.

Abstract: A plug for an electromagnetic field channel. The plug may have a tubular body capped at one end. The body may be composed of a plurality of coaxial layers, including electromagnetically inert outermost and innermost layers. A MU-metallic second layer may be wrapped by the outermost electromagnetically inert layer, and a copper third layer may be wrapped by the innermost electromagnetically inert layer. An air gap may be disposed between the second and third layers.

Abstract: A multilayer electromagnetic shielding system providing two stacks spaced apart by an air gap, wherein each stack has an electric-field-attenuating layer adhered to a magnetic-field-attenuating layer. An electromagnetically inert material may sandwich the spaced apart stacks for insulative and structural purposes.

Abstract: A method and device for measuring electromagnetic fields embodied in an electromagnetic field (EMF) channel that defines a lumen for receiving an EMF-measuring sensor. The EMF channel includes coaxial inner first layer of Mu-metal surrounded by a second layer of interlaced mesh copper, wherein the first layer is configured to attenuate the magnetic field and the copper attenuates the electric field of external, undesired EMFs, thereby promote propagation of a desired EMF to the housed senor.