Conventional capacitive sensors are known from simple tasks e.g. as proximity sensor or for fill level measurements. With corresponding design and evaluation electronics, these sensors can also be used for high precision displacement and position measurements, achieving resolutions well below one nanometer. Capacitive displacement sensors are typically used in applications where fast displacement changes have to be acquired, where no forces can be exerted on the measurement object, where highly sensitive surfaces do not allow any contact, or where a long service life of the sensor is required.
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Measurement on all objects
Since the measurement can be carried out conductive and non-conductive objects, there is no interference caused by e.g. the optical characteristics of the target. Therefore, even transparent and reflecting surfaces can be detected at maximum precision.
Compared to other non-contact measurement techniques, capacitive displacement measurement is characterised by extreme precision and stability of measurements. As thermally induced conductivity changes of the measuring object have no influence on measurements, the principle is also reliable even with fluctuations in temperature.
Benefits of capacitive measurement principle
- Wear-free and non-contact measurement
- No interfering force on the target
- Robust against run out of electrically conductive measurement objects
- Unmatched accuracy and stability
- High bandwidth for fast measurements