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Capacitive sensing is a widely used technology in human presence detection, fluid-level sensing or hands on detection for autonomous driving. It works on the principle of capacitance: charge accumulates in the gap between two sheets of metal, or ‘electrodes’, when a voltage is applied to one electrode. The amount of charge which accumulates depends on a property, the ‘permittivity’, of the material between the electrodes. At the heart of the capacitive sensor measurement system is a type of capacitive sensing technology called I/Q demodulation. This method measures the resistive as well as the capacitive element of a system’s impedance. The effect of this is that, unlike other methods for capacitive sensing, it works reliably even in difficult conditions, and is sensitive to small changes in resistance.

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