Non-contacting displacement sensors 

This sensor type is  typically used on journal-bearing machines to determine the position of the shaft (X-/Y-measurement), relative shaft vibration, axial vibration, or speed/trigger.

Our portfolio consists of so-called discrete and integrated designs.

Measurement principle:

The displacement sensor oscillator generates a constant frequency sine wave that passes through an inductive coil, which produces an electromagnetic field in front of the sensor face. When a target metal object comes close to this field, some electromagnetic energy is transferred to the target as eddy currents. This transfer of energy reduces the amplitude of the oscillator, which is inversely proportional to the distance of the target metal object being monitored to the face of the sensor.

Measurements show the movement of the shaft within the bearing. They are not influenced by oil or water and allow for a low-frequency response (down 0 Hz).

Machine problems typically detected by displacement sensor measurements

• Unbalance
• Misalignment
• Bent shaft
• Eccentricity
• Shaft crack
• Coupling problems
• Oil whirl
• Oil whip
• Rotor rub

For contacting displacement sensors, please see under “Reference and Other Sensors”.