Methods and systems for measuring parameters of rotating shafts and couplings

A measurement system comprising:

• a shaft extended in a longitudinal direction;
• a target wheel configured to rotate with the shaft, wherein the target wheel comprises a plurality of sensor targets circumferentially distributed around the target wheel, and wherein the plurality of sensor targets includes a first plurality of targets that are slanted in the longitudinal direction and a second plurality of targets that are parallel to the longitudinal direction, said first plurality of targets includes at least a first slanted target slanted in an opposite direction, in the longitudinal direction, to at least a second slanted target;
• a sensor array comprising at least three sensors mounted radially around the shaft and configured to detect the plurality of sensor targets as the target wheel rotates with the shaft;
• and
• a controller configured to receive sensor signals from the at least three sensors and determine, based on the sensor signals, at least an axial displacement measurement of the shaft in the longitudinal direction and a radial displacement measurement of the shaft.