Patent ID: 9638823
Date: 2017-05-02
CPC Classifications: G01B,G01V

Claim:
1. A metal sensor comprising: a primary coil, which is arranged in a first plane; a first compensation coil, which is arranged in a second plane; a second compensation coil, which is arranged in a third plane; a magnetic field sensor, which is arranged in a fourth plane; and a signal source electrically connected to the primary coil, the first compensation coil, and the second compensation coil, and configured to supply the primary coil, the first compensation coil, and the second compensation coil with current, wherein the first plane, the second plane, the third plane and the fourth plane are oriented parallel to one another and in each case perpendicularly to a common z-direction, wherein the signal source supplies current to the primary coil and to the first compensation coil to generate a magnetic field defining a first shape, wherein the signal source supplies current to the primary coil and to the second compensation to generate a magnetic field defining a second shape, and wherein the first shape is different from the second shape.