Patent ID: 9651702
Date: 2017-05-16
CPC Classifications: G01V,H01F,H01L,H02J

Claim:
1. A coil arrangement for a magnetic sensor for detecting metallic objects in a subgrade medium, comprising: a first main coil, having a winding plane to a magnetomotive force that is aligned in a vertical direction relative to a movement surface of the magnetic sensor over the subgrade medium that is largely parallel to the movement surface of the magnetic sensor; at least two coils of a first coil group arranged in an interior of an expanded winding cylinder of the first main coil between an upper edge and a lower edge of a coil body of the first main coil; and at least two coils of a second coil group arranged in the interior of the expanded winding cylinder of the first main coil, wherein the at least two coils of the second coil group have a different alignment of a winding plane as compared to a winding plane of the at least two coils of the first coil group.