Patent ID: 9494556
Filing Date: 2016-11-15
CPC Classification: G01D,G01L,G01N

Claim Text:
1. A force measurement sensor for measuring an applied force onto an object, comprising: a first sensing unit including (a) a first flux concentrator having a first facing orientation pointing towards a surface of the object; (b) a first magnetic field generating unit being adapted for generating a magnetic field; (c) a first magnetic field detector unit being adapted for detecting a first magnetic field which field being generated by the first magnetic field generating unit and being influenced by the applied force to be measured, wherein the first magnetic field detector unit is further adapted for outputting a first signal being representative for the detected magnetic field; and (d) an evaluating unit being adapted for evaluating a signal strength of the first signal and determining the applied force based on the first signal, and a first electromagnetic interference coil being adapted for measuring electromagnetic fields, wherein a longitudinal axis of the first magnetic field detector unit is arranged such that a first lateral offset between the longitudinal axis of the first magnetic field detector unit and a central axis of the first flux concentrator is provided, wherein the first lateral offset is perpendicular to a longitudinal direction of the first flux concentrator, wherein the first magnetic field generating unit is formed as a second coil and wound around the first flux concentrator, wherein the first flux concentrator includes a first pole and a second pole being arranged with respect to each other in a longitudinal direction of the first flux concentrator, and wherein the first magnetic field detector is arranged between the first pole and the second pole, wherein the first electromagnetic interference coil is arranged opposite to the first magnetic field detector unit with respect to the first flux concentrator, such that the first electromagnetic interference coil is adapted to detect electromagnetic fields in the surroundings of the first sensing unit and wherein the first electromagnetic interference coil is connected to the evaluation unit and is adapted to provide a signal based on which the evaluation unit compensates the effect of interference fields to the first signal.