Patent ID: 9647483
Date: 2017-05-09
CPC Classifications: H01F,H02J

Claim:
1. A system comprising: an insulated transmit coil system comprising an insulated non-planar tapered transmit coil disposed within a tapered ferrite housing and a layer of insulating material surrounding the insulated non-planar tapered transmit coil and the tapered ferrite housing; and an insulated receive coil system, nested within the insulated transmit coil system, comprising a ferrite plug comprising a column portion centrally secured to a plate portion, a non-planar receive coil wound around the column portion, wherein the non-planar receive coil has a smaller diameter than the insulated non-planar tapered transmit coil, a layer of insulating material surrounding the column portion and the non-planar receive coil, and a hemispherical covering surrounding the insulated column portion and non-planar receive coil, wherein the maximum outside diameter of the hemispherical covering is less than or equal to the minimum inside diameter of the insulated non-planar tapered transmit coil, wherein the non-planar receive coil is positioned within the insulated non-planar tapered transmit coil, forming a closed magnetic circuit.