Patent ID: 9677913
Date: 2017-06-13
CPC Classifications: G01D

Claim:
1. An apparatus, comprising: a primary inductor; a first secondary inductor that is field-coupled to the primary inductor; and a second secondary inductor that is field-coupled to the primary inductor; wherein the first secondary inductor and the second secondary inductor are configured as coordinated inductors to detect motion of a coupler; wherein the coordinated inductors are configured to provide a reference signal and a measurement signal, wherein the reference signal has a constant amplitude across a range of motion of the coupler; wherein the first secondary inductor and the second secondary inductor are divided into segments with the range of motion, wherein the range of motion comprises a plurality of segments; and a phase detector configured to identify a current segment out of the plurality of segments, wherein the current segment corresponds to a position of the coupler.