Patent ID: 7915890

Claim:
A sensor device comprising: a base substrate; a first flux concentrator fixedly attached to the base substrate, the first flux concentrator comprising a first proximal end region and a first distal end region; a second flux concentrator fixedly attached to the base substrate, the second flux concentrator comprising a second proximal end region and a second distal end region, the first flux concentrator and the second flux concentrator positioned with the first proximal end region facing and spaced from the second proximal end region, the first proximal end region and the second proximal end region defining a gap therebetween; and a magnetic sensor element positioned between the first proximal end region and the second proximal end region, the sensor element moveable towards and away from the base substrate; wherein the sensor device comprises a first system to offset stray magnetic fields, and a second system to modulate the sensor element position relative to the base substrate.