Capacitive displacement sensor: Difference between revisions

Revision as of 21:55, 29 October 2016

Revision as of 19:28, 10 September 2019

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:<math>C \propto \dfrac{1}{d} </math>

Where α indicates a proportional relationship.

Due to this proportional relationship, a capacitive sensing system is able to measure changes in capacitance and translate these changes intoin distance measurements.

The operation of the sensor for measuring thickness of non-conductive materials can be thought of as two capacitors in series, with each having a different dielectric (and dielectric constant). The sum of the thicknesses of the two dielectric materials remains constant but the thickness of each can vary. The thickness of the material to be measured displaces the other dielectric. The gap is often an air gap, (dielectric constant = 1) and the material has a higher dielectric. As the material gets thicker, the capacitance increases and is sensed by the system.