Shaft Displacement Measurement Using Capacitive Sensors

The paper is focused on shaft displacement measurement with the use of capacitive sensors made by printed circuit technology. A basis is a measuring unit with a capacitive-digital converter (CDC), which can provide the measured data to the main microcontroller for their processing and storage. The main goal was to design a low-cost solution for measuring the position of the shaft, which would be able to compete with professional and expensive units. Therefore, the result of this work is also a comparison of measured data with data from the professional unit and sensors from the Micro-Epsilon company. This unit also served as a calibration device. Thanks to this device, it was possible to convert the resulting signal representing capacity to the displacement in micrometres.