2. Capacitive sensors

2.1 Principle

A capacitive sensor is usually made with a flat electrode surrounded by a guard ring (figure 16 ). Together with the part to be measured, the electrode forms a flat capacitor. The distance d between this electrode and the surface of the part to be measured is determined by measuring the capacitance C of the capacitor. They are linked by the equation : $C = \frac{ε \cdot S}{d}$

with :

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Capacitive sensors