| 摘要 |
A magnetic field sensing system comprising: a magnetic field shielding structure including a series of N annular rings of inner diameter, a, outer diameter, b, and thickness, t, the series of magnetic rings being geometrically aligned so to be concentric to a common axis of concentricity, the number of rings N being equal to or greater than two, the rings being formed from a high permeability, magnetically soft ferromagnetic material of permeability mu , and where the rings are physically separated from each other by a series of N-1 spacer layers made from any nonmagnetic material (including in part air), and which function to space the magnetic rings apart by a distance t', and wherein the series of N high permeability magnetic rings and N-1 nonmagnetic spacer layers form stack of length L=Nt+(N-1) t' along the direction parallel to the axis of concentricity; and a magnetic field sensor located within the structure aligned with common axis of concentricity./!
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