PRIOLEAU, LORI-ANN S.,JOHNSON, JUSTIN M.,LORENTZ, ROBERT D.,BADRI, BRINDA B.,VANOUS, JAMES C.,CHATTERTON, JACOB D.,PERRON, STEVEN J.,BATTLES, DONALD R.,VEERARAGHAVAN, BADRI
申请号：
EP12822335
公开号：
EP2741721A4
申请日:
2012.08.03
申请国别(地区):
EP
年份:
2015
代理人:
摘要：
A wetness sensor includes a self-supporting substrate and an electrically conductive trace carried by the substrate. The trace is patterned to provide at least a portion of a tuned RF circuit, which may be disposed on only one side of the substrate and characterized by an impedance or resistance. The trace is not self-supporting. The substrate is adapted to dissolve, swell, or otherwise degrade when contacted by a target fluid. Such degradation produces a drastic change in the operation of the RF circuit, which can be interpreted by a remote reader as a “wet” condition. Contact of the substrate by the target fluid may change the impedance or resistance of the RF circuit by at least a factor of 5, 10, 100, or 1000, and/or may cause the trace to disintegrate so as to provide the RF circuit with an open circuit, and/or may substantially render the RF circuit inoperative.
