An Experimental Investigation of the Nonlinear Response of Thin-Walled Ferromagnetic Shields to Short-Duration Current Pulses
CONSTRUCTION ENGINEERING RESEARCH LAB (ARMY) CHAMPAIGN IL
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Intense electromagnetic EM fields can disrupt, disable, damage, or destroy sensitive electronic equipment that is needed to perform critical functions such as those related to command, control, communications, computer, intelligence, surveillance, and reconnaissance C4ISR. EM shielding is used to protect equipment against such detrimental effects to promote the survivability of mission critical systems. Ferromagnetic materials can have a high magnetic permeability, which may be a significant advantage in shielding applications however, the permeability varies with applied magnetic field intensity. An understanding of the performance of ferromagnetic shields under intense transient field conditions is needed to design a shield to attenuate fields to an acceptable level, to predict the performance of a given shield, or to determine the level of EM fields that would defeat a given shield and induce unacceptable EM field levels. This paper presents the results of an experimental investigation of the nonlinear response of thin-walled ferromagnetic shields to short-duration surface current pulses. The results provide an improved understanding of the performance of ferromagnetic shields under intense transient EM field conditions.
- Electromagnetic Shielding
- Electricity and Magnetism