Patent ID: 8508243
Filing Date: 2013-08-13
Classification: G01D

Abstract:
1. An inductive incremental displacement sensor for determining a displacement of a first object relative to a second object, comprising: at least one graduated track mountable on the first object and having periodically alternating conductive regions and insulating regions; at least one scanning unit mountable on the second object for scanning the graduated track with a first sensor unit and a second sensor unit, which are laterally spaced from each other by a distance d=n*(p/2)+q, wherein n is an integer or zero, p is a pitch of the graduated track, and 0<|q|<p/2; and an evaluation unit for determining the displacement based on switching signals delivered by the first sensor unit and the second sensor unit; wherein the first sensor unit and the second sensor unit each have a first inductive sensor and a second inductive sensor spaced at a distance from each other, the conductive regions and the insulating regions have different damping properties for the first inductive sensor and the second inductive sensor and are differentiated by the first inductive sensors and by the second inductive sensors based on different damping properties; and wherein the first sensor unit and the second sensor unit deliver a switching signal relevant to a conductive region of the graduated track when a difference or a ratio of the detection signals from the first and second inductive sensors allocated to the respective sensor unit as generated by the conductive region is less than a specifiable threshold.