Patent ID: 6192753
Filing Date: 2001-02-27
Classification: G01D,G01F,Y10S

Abstract:
A sensor system for measuring the level of a fluid, the sensor system comprising:a tube having a first end, a second end and a longitudinal axis extending therebetween;a first float adapted to move adjacent the tube between the first end and the second end thereof;a primary coil wound around the longitudinal axis between the first end and the second end of the tube;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 tube;a second secondary coil wound at the first periodically varying winding density distribution around the longitudinal axis between the first end and the second end of the tube, wherein the winding density distribution of the second secondary coil is shifted relative to the winding density distribution of the first secondary coil; and a third secondary coil wound at a one of a monotonically and linearly varying winding density distribution around the longitudinal axis between the first end and the second end of the tube.