Patent ID: 6192754
Filing Date: 2001-02-27
Classification: G01D,G01F,Y10S

Abstract:
A displacement measuring sensor system, comprising:a first member having a first end, a second end and a longitudinal axis extending therebetween;a second member positioned adjacent the first member between the first end and the second end thereof, the first member and the second member configured to move relative to each other;a primary coil wound around the longitudinal axis between the first end and the second end of the first member;a first secondary coil wound around the longitudinal axis at a first periodically varying winding density distribution between the first end and the second end of the first member;a second secondary coil wound at the first periodically varying winding density distribution around the longitudinal axis between the first end and second end of the first member, wherein the winding density distribution of the second secondary coil is shifted relative to the winding density of the first secondary coil; anda third secondary coil wound at one of a monotonically and a linearly varying winding density distribution around the longitudinal axis between the first end and the second end of the first member.