Short-range distance sensors for clearance measurement

Abstract

This research explores types of optical sensors, other non-contact traditional sensors, eddy current sensors, as well as capacitive sensors. The study also provides analysis, working principles, performance, and properties of these sensors, including applications, measurement ranges, and price differences. The aim is to conduct experiments on displacement sensors to validate the minimum displacement measurements in micrometres. This research is intended to test whether misalignment can be measured by detecting the rotor’s displacement from its original, non-loaded position to its position after coupling with the load machine. Moreover, to select suitable sensors for detecting the small displacements by the internal clearance of the bearing in both radial and axial directions.

First of all, the confocal chromatic sensor was selected as an ideal choice. However, due to limited funds, this study used eddy current sensors as the next best option. Experiments conducted in a laboratory demonstrated the capability of these sensors to measure minimum displacements in the micrometre range. Furthermore, the direct measurement of misalignment was recorded and the research successfully proved the possibility of measurements using an eddy current sensor setup.