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 :
with :
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Capacitive sensors
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"Mechanical and dimensional measurements"
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