The increased effectiveness of multiple over single shields is shown and formulas (including a recursion formula suitable for automatic computation) are given for the computation of the shielding ratio (field outside/field inside) for any number of concentric shells of contemporary high-permeability materials in any combination. Sample designs are given for shields 2¼, 3⅛, and 5¼ in. i.d. Scaling rules and charts are given for finding other designs without calculation. Graphs are given for the penetration of the field into the open end of the shield. The alternating-field case is treated and formulas are given for finding the shielding ratio for alternating fields.
No takes yet. Share an insight, caveat, or question.
W. G. Wadey (1956) studied this question.
Synapse has enriched 5 related papers. Consider them for comparative context: