Patent ID: 7705585
Filing Date: 2010-04-27
Classification: G01D

Abstract:
1. An inductive detector for measuring relative position along a measurement path, comprising: a passive, laminar electrical intermediate device extending along the measurement path wherein the extent of the said electrical intermediate device in an axis normal to the measurement path varies along the measurement axis; at least one laminar transmit winding and at least two laminar receive windings wherein the said at least two laminar receive windings are displaced from each other along the measurement path wherein each laminar receive winding is substantially electrically balanced with respect to the at least one laminar transmit winding; arranged such that the mutual inductance between at least one laminar transmit winding and at least two laminar receive windings indicates the relative position of the electrical intermediate device, and wherein each laminar receive winding comprises at least one loop which is substantially unaffected by displacement of the laminar electrical intermediate device.