Patent ID: 6972558

Claim:
A magnetic sensor assembly for measuring changes in the position of a lever arm comprising: a support; a lever arm pivotably movable about an axis of rotation or a pivot point and being attached to the support at a first end of the lever arm; an annular ring bi-polar magnet producing an inner-Halbach 2 pole magnetic field effect having an increased flux internal of the annular ring bi-polar magnet and a minimum external flux outside the magnet, the magnetic field being adjacent to the first end of the lever arm and fixed to rotate in a predetermined arc about the pivot point or axis of rotation in response to a pivotal movement of the lever arm; and a magnetic sensor positioned in proximity to the magnet detects changes in the magnetic field due to rotation of the magnet along a predetermined arc wherein the predetermined arc has a constant radius of curvature forming a circular arc, and wherein the magnetic sensor is a Hall element positioned internal relative to the arc radius of curvature, thereby shielding the sensed magnetic field internal of the magnet from extraneous EMI or EMF noise.