Sensing diaper content

Abstract

A system for sensing diaper content includes a diaper, an outer coupling layer and a sensing circuitry. The diaper has a circuitry layer having inner input capacitor plates, tracks arranged to provide a resistive coupling between the inner capacitor plates dependent on the content, and inner output capacitor plates in galvanic contact with the respective inner input capacitor plates. The outer coupling layer contains outer input- and output capacitor plates arranged to form respective input- and output capacitors with the inner input- and output capacitor plates in the diaper when the outer coupling layer is provided onto the outside of the diaper. The sensing circuitry is arranged to apply an input signal onto the outer input capacitor plates, and to measure an output signal from the outer output capacitor plates resulting from the input signal and the resistive coupling thereby sensing the content.

Dependencies are inferred from the claim text.