Abstract: An absorbent article for absorbing liquid discharge of a wearer when worn in the crotch region includes an absorbent core for doing the absorbing of the liquid discharge. A conductive layer is in electrical contact with the absorbent core. The article includes at least one set of first and second electrical contacts secured in intimate physical and electrical contact with the conductive layer such that when an electric potential is applied between the first and second electrical contacts, an electric current travels between them and through the conductive layer in such a way so as to follow a first relatively high impedance path along the conductive layer when the absorbent core is dry and a relatively low impedance path when the absorbent core is wet. This system allows a system verification check, even in the dry state, and the determination of the extent of the wet portion of the absorbent core.

Abstract: An absorbent article for absorbing liquid discharge of a wearer includes conductive loops each in an open loop shape having terminal ends for electrically communicating with opposing poles of an electric potential generator such that current flows around the full conductive loop between the terminal ends when a space defined within the open loop shape is dry and such that liquid discharge in the space defined within the open loop shape is able to cause a short circuit in the conductive loop so that the current flows around a reduced impedance path. The impedance change is measureable to determine a location relative to the terminal ends where the liquid discharge has caused the short circuit. The conductive loops are oriented such that the direction in which the current travels up an outward leg of the respective conductive loop is in substantially the opposite direction for a first conductive loop as for a second conductive loop.

Abstract: An absorbent article for absorbing liquid discharge when worn on the crotch region of the body of a user includes a plurality of detection zones for detecting the liquid discharge. Each detection zone is provided by first and second electrically conductive paths that are electrically isolated from one another and arranged so that a liquid discharge between the first and second conductive paths allows electrical current to flow between the first and second conductive paths which is able to be detected to detect the presence of liquid discharge in the respective zone. The plurality of zones are longitudinally distributed with respect to the absorbent article along an absorbent core of the absorbent article, to allow the longitudinal extent of the discharge to be ascertained. The first and second conductive paths are longitudinally spaced from one another. The first and second conductive paths are elongate and are laterally aligned.