Patent ID: 6853183

Claim:
A device for contactless measurement of a displacement path comprising: (a) a sensor electronics system; (b) an inductive sensor comprising at least one coil wherein each coil is configured with a helicoidal conductor disposed on a plane and having two flat surfaces, one of said two flat surfaces forming a measuring surface which variously covers a measuring object, arranged at a distance, according to movement thereof parallel to said measuring surface; wherein said sensor electronics system provides an alternating current to said inductive sensor and evaluates changes in the alternating current caused by the measuring object; wherein the measuring object is guided at a constant distance over the surface of the flat coil; wherein the sensor electronics system is formed for detecting changes in attenuation due to the varying area of the flat coil covered by the measuring object; wherein the measuring object that influences the measuring surface is electrically conductive, or the measuring object has an electrically conductive target or measuring collar, and covers a coil area of the flat coil that can be predetermined geometrically as a function of the position of the target or measuring collar; and wherein a rectangular measuring surface is diagonally divided into two triangular flat coils, whereby their inductances and ohmic resistors form half of a bridge circuit, the other half of which is complemented with resistors, to produce a full bridge.